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WorksheetsThe Integumentary System: Skin Structure
Total questions: 100
Worksheet time: 50mins
Which skin layer is the outermost barrier providing primary protection in animals?
Subcutis
Fascia
Dermis
Epidermis
Haired animal skin typically has how many distinct epidermal layers compared with hairless skin?
Three in haired, five in hairless
Five in haired, three in hairless
Four in haired, six in hairless
Two in haired, four in hairless
Which description best distinguishes the papillary and reticular layers of the dermis?
Papillary houses sweat glands; reticular forms basement membrane
Papillary stores fat; reticular anchors epidermis tightly
Papillary anchors epidermis; reticular contains follicles, glands, vessels
Papillary produces keratin; reticular makes vitamin D precursors
A laceration extends through the dermis into the subcutis. Which functional consequence is most expected due to subcutis involvement?
Detachment of epidermis from lack of basement membrane
Complete absence of blood vessels in the wound
Loss of keratinocyte turnover at the surface
Increased skin mobility from loose connective tissue
Which statement about basic hair features in mammals is most accurate?
Hair reduces dermal elasticity by replacing elastic fibers
Hair occurs widely in reptiles with sparse body distribution
Hair is a mammalian trait with thick haircoats over the body
Hair primarily forms within the epidermal papillary layer
Which feature best distinguishes guard hair from wool hair in mammals?
Guard hair forms insulating soft undercoat
Guard hair lies close and sweeps over body
Guard hair emerges from separate skin pores
Guard hair lacks attachment to arrector pili
Tactile (sinus) hairs primarily serve what function in mammals?
Mechanoreception for spatial sensing
Thermal insulation during cold weather
Pigmentation for social signaling
Sebum distribution across the coat
Footpads contribute to locomotion primarily by which combination of properties?
Loose dermis and reduced connective tissue
Thin epidermis and absent sweat glands
Rigid keratin and minimal vascularity
Fat cushioning and traction epithelium
Which statement about wool (secondary) hair is accurate?
Forms undercoat conserving heat in cold
Long thick shafts give smooth appearance
Each hair arises from separate follicle only
Proximal end attaches to arrector pili muscle
Which integumentary modification is correctly matched with its origin or covering?
Antler is permanent keratinized epidermal cone
Claw plate is a keratin sheath over bone
Hoof is avascular cartilage surrounding toe
Nail derives from dermis without epidermis
In hooves, failure of which specific structure leads to laminitis?
Frog acting as shock absorber pad
Insensitive sole covering the ground
Coronet forming superficial wall ring
Lamina attaching hoof to digital bone
Which taxonomic restriction for nails is correct?
Only ungulates possess true nails
Only primates possess true nails
Only rodents possess true nails
Only carnivores possess true nails
A cat presents with decreased traction and silent footfalls after whisker trimming. Which structure was altered and what was its principal location?
Guard hairs located on the trunk
Footpad epithelium on the toes
Tactile hairs located on the face
Wool hairs located in the undercoat
During a farrier exam, you are asked to justify why laminitis can be fatal. Which reasoning best supports this claim?
Loss of laminar attachment destabilizes the distal phalanx
Loss of frog tissue prevents sweat-based cooling only
Overgrowth of hoof wall reduces outer pigmentation
Excessive keratinization strengthens wall beyond tolerance
Which statement best differentiates horns from antlers in mammals?
Antlers arise from frontal bones covered by keratin
Horns are shed annually with rapid regrowth cycles
Antlers are permanent with a keratinized outer sheath
Horns are permanent with keratin sheath over bone
A researcher observes epidermal cells releasing secretions by exocytosis without losing cytoplasm. Which skin gland type fits this mechanism?
Merocrine glands using exocytosis release
Apocrine glands releasing entire cells
Holocrine glands rupturing whole cells
Sebaceous glands by membrane lysis
Which feature describes beak anatomy across birds?
Bony framework with vascular connective layer
Pure enamel structure over dentin core
Solid keratin rod without blood supply
Cartilaginous core with mucous covering
In apocrine secretion, how are products released from glandular cells?
By diffusion across tight junction layers
By complete cell rupture and disintegration
By active transport through ion channels
By budding off portions of the cell membrane
A pathology case shows thickening of a horn over time with no seasonal shedding. Which conclusion is most supported?
The structure elongates and thickens as it grows
The structure is deciduous and replaced each season
The structure lacks a bony base in the skull
The structure is covered by non-keratinized epithelium
Which statement best describes the primary function of sebum from sebaceous glands?
Produces milk for neonatal nutrition
Cools the body through evaporative heat loss
Lubricates and waterproofs skin and coat
Stimulates hair follicle contraction reflex
Apocrine sweat glands in many domestic animals primarily:
Secrete watery sweat onto bare skin regions
Release sebum to inhibit bacterial growth
Open only within specialized scent glands
Discharge protein-rich sweat into hair follicles
Eccrine glands in animals most commonly:
Empty oily secretions into hair shafts
Secrete more watery sweat onto naked skin
Produce pheromones in tail gland patches
Open exclusively near the anal sphincter
Mammary glands are best characterized as:
Eccrine glands unaffected by hormones
Dermal horns that project from the epidermis
Modified sweat glands present in both sexes
Modified sebaceous glands in females only
Which combination correctly pairs gland and typical location?
Ceruminous glands – external ear canal
Carpal glands – plantar surface of hoof
Circumoral glands – dorsal tail surface
Horn glands – lip margin of carnivores
Horn glands are scent glands especially noted in:
Goats of both sexes
Male horses only
Female pigs only
Rodents and rabbits
Circumoral glands in cats are primarily used to:
Lubricate the external ear canal
Cool the body during exercise
Mark territory with lip secretions
Provide milk to neonates
Carpal glands are present in pigs and cats. In pigs they are located:
On the dorsal surface of the tail
On the mediopalmar aspect of the limb
Within the nasal planum near nares
Adjacent to the anal sphincter wall
Which statement about feline carpal glands is most accurate?
Embedded in the anal sphincter as cutaneous pouches
Situated within the ear canal near the pinna
Found at the tail tip as a yellowish patch
Located proximal to the carpal pad as a palpable tuft
The tail gland in some carnivores is described as:
An oval patch of large sebaceous scent glands dorsally
A mammary-derived patch affected by lactation
A cluster of eccrine glands ventral to the base
A ceruminous field producing ear wax distally
Anal sacs in carnivores are best described as:
Cutaneous pouches opening beside the anus with foul odor
Hormone-insensitive ducts within the mammary cistern
Clusters of apocrine sweat glands beneath the carpal pad
Sebaceous follicles along the dorsal tail midline
Which secretion-function pairing is correct?
Sebum – retards bacterial growth on skin
Eccrine sweat – oils and waterproofs hair coat
Cerumen – pheromonal marking of territories
Apocrine sweat – produces milk for offspring
During mating, sows use which glandular structures for marking?
Horn glands located on the skull
Ceruminous glands of the external ear
Carpal glands associated with the limb
Eccrine glands of the nasal planum
Which region typically has eccrine, not apocrine, secretion in many species?
Dorsal tail patches in carnivores
Hairy regions surrounding follicles
Naked or nearly naked skin areas
Lips bearing circumoral glands
Which feature distinguishes mammary glands from most other dermal glands?
They are located exclusively near the anus
Structure and function are strongly hormone-dependent
They secrete primarily cerumen into the ear canal
They open directly into large tail follicles
Which mechanism best explains allergic dermatitis in companion animals?
Nutritional deficiency of essential fatty acids
Primary fungal invasion of hair follicles
Direct toxin damage to epidermal keratinocytes
Immune reaction to normally harmless substances
A dog presents with intense pruritus and erythema after exposure to grass. Which allergy category fits best?
Seasonal environmental allergens exposure
Drug-induced autoimmune reaction
Parasitic hypersensitivity to mites
Primary food protein intolerance
Moist pyoderma (hot spots) most commonly begins after which initiating event?
Self-trauma from scratching that disrupts skin
Hematogenous spread of deep bacteria
Viral papilloma rupture with bleeding
Sunburn causing superficial keratin loss
Which sign set is most typical for moist pyoderma lesions?
Firm, nonpainful subcutaneous nodules
Dry, flaky, alopecic patches
Cold, pale, numb skin areas
Red, hot, gooey, painful plaques
Deep pyoderma differs from moist pyoderma primarily by what characteristic?
Extension into deep dermal layers with draining tracts
Presence of pruritus without exudative lesions
Association with viral infection of hair shafts
Resolution without antibiotics or cleansing
Which management step is appropriate initial care for a hot spot on a dog?
Allow air-drying without any intervention
Begin systemic steroids without diagnosis
Apply occlusive bandage tightly overnight
Clip and clean the area with topical spray
Mange is best defined as which pathologic process?
Mite-induced inflammation of epidermis and dermis
Bacterial infection of sebaceous glands only
Fungal colonization of the stratum corneum
Allergic reaction to environmental pollens
Which statement accurately defines neoplasia in the skin?
Controlled repair after acute injury
Programmed apoptosis of damaged cells
Uncontrolled replication of skin cells
Benign hyperplasia from temporary hormones
Which risk factor commonly contributes to cutaneous neoplasia development in animals?
High altitude with reduced oxygen levels
Low dietary protein and essential minerals
Chronic cold exposure in winter months
DNA damage from sunlight or viral infections
Cutaneous lymphoma most specifically involves which cell population and presentation?
Uncontrolled B-cell or T-cell proliferation with dry, flaky, red patches
Overgrowth of keratinocytes with crusted papillomas
Hyperplasia of fibroblasts with firm scar-like plaques
Expansion of mast cells with wheals and urticaria
Which feature most commonly differentiates a histiocytoma from a mast cell tumor on physical exam?
Ulcerated edematous itchy nodule
Slowly growing discrete lesion
Small pink hairless rapid bump
Firm immovable subcutaneous mass
Mast cell tumors often release mediators that cause local swelling and pruritus. Which medication targets this effect during management?
Antihistamines during medical therapy
NSAIDs for prolonged analgesia
Antifungals for secondary infection
Antibiotics for bacterial coverage
A solitary, slowly enlarging, discrete, sometimes ulcerated skin lesion in a dog best fits which diagnosis?
Squamous cell carcinoma
Injection-site sarcoma
Histiocytoma typical sign
Basal cell tumor presentation
Injection-related malignancies are most strongly linked to which mechanism?
Nutritional deficiency at site
Chronic post-injection inflammation
Direct bacterial contamination
Viral oncogenesis after vaccines
Which diagnostic approach is common to confirming mast cell tumor, histiocytoma, and squamous cell carcinoma?
Urinalysis with culture
Skin scraping technique
Fine-needle aspiration cytology
Serum biochemistry panel
Which statement about prognosis is most accurate for a single basal cell tumor that is excised with margins?
Poor unless adjunctive radiation
Good with complete surgical excision
Guarded due to early metastasis
Unchanged by surgical treatment
Which sign most strongly suggests squamous cell carcinoma in a sun-exposed area?
Crusted pink ulcer with odor
Soft pigmented flat macule
Firm painless deep nodule
Multiple pruritic papules
Where are squamous cell carcinomas commonly found in domestic species?
Face ears eyes or genitalia
Thoracic wall and pelvis
Axilla flank and groin
Dorsal neck and tail
Which melanoma presentation is most characteristic in horses or dogs?
Firm non-painful injection mass
Pink hairless papule cluster
Multiple crusted white plaques
Oral dark mass on gingiva
What is the preferred initial treatment for an injection-site sarcoma when feasible?
Wide-margin surgical excision
Topical corticosteroid therapy
Observation with recheck later
Fine-needle aspiration drainage
Which finding supports histiocytoma rather than basal cell tumor in a young dog?
Firm immobile deep mass
Ulcer with necrotic malodor
Slowly evolving discrete nodule
Rapidly growing small pink mass
Which procedure improves staging for basal cell tumors beyond primary tumor biopsy?
Lymph node fine-needle aspiration
Bone marrow aspirate analysis
Bronchoalveolar lavage sampling
Synovial fluid cytologic exam
Which treatment combination is commonly considered for melanoma after wide resection?
Vitamin therapy and phototherapy
Intralesional steroids and cryotherapy
Systemic antifungals and debridement
Lymph node removal and radiation
Mammary adenocarcinoma development is most associated with which hormonal influence?
Thyroid hormone excess state
Progesterone deficiency syndrome
Cortisol-mediated immunosuppression
Estrogen-driven mammary stimulation
Which prevention strategy is recommended to reduce risk of injection-related malignancies?
Rotate antibiotics at each visit
Administer injections into muscle only
Use non-adjuvanted vaccines when possible
Avoid subcutaneous fluids in adults
Which factor is NOT a common cause of burns in small animals?
Friction from dragging injuries
Chemical exposure to corrosives
Heat from flames or hot surfaces
Parasitic mites in the fur
A dog presents with blisters, marked edema, and severe pain after a kitchen accident. Which initial management priority is most appropriate?
Oral steroids without debridement
Immediate pain control and stabilization
Aggressive exercise to prevent stiffness
Delay care until blisters rupture
Alopecia is best defined as which clinical finding?
Complete hair loss of a skin area
Excess keratin plugs in ear margins
Greasy coat with sebum buildup
Boils forming between the toes
Which underlying process is the most common cause of alopecia in companion animals?
Severe dietary deficiency
Congenital genetic mutations
Primary hormonal imbalance
Inflammation of the skin units
Interdigital furunculosis most accurately describes which condition?
Fungal nodules along the tail
Dry scaling limited to the pinnae
Boils or blisters forming between digits
Diffuse erythema without pustules
Which sign is typical of furunculosis?
Hypopigmented macules only
Symmetric nonpruritic alopecia
Crusting with purulent lesions
Firm nonpainful plaques
Which approach is essential when treating furunculosis?
Antifungal-only monotherapy
Topical or systemic antimicrobials
High-dose diuretics and fluids
Immediate surgical amputation
Which statement best characterizes seborrhea in dogs?
Dermal fibrosis after chronic wounds
Autoimmune loss of melanocytes only
Skin disease with excess keratin or sebum
Primary infestation by Demodex mites
Which pairing correctly matches seborrhea type with a hallmark feature?
Oily seborrhea—minimal sebum production
Dry seborrhea—greasy unkempt haircoat
Dry seborrhea—dandruff and keratin plugs
Oily seborrhea—brittle dry scaling only
Anal sacculitis most often results from which pathophysiologic sequence?
Thickened secretions obstruct ducts
Congenital absence of anal sacs
Immune-mediated cartilage erosion
Neurogenic loss of rectal tone
Which intervention is routinely used to manage uncomplicated anal sacculitis?
High-dose loop diuretics
Systemic anticoagulation therapy
Partial colectomy and stoma
Anal sac expression and lavage
Anal sac adenocarcinoma is best described as which tumor type?
Round cell tumor of mast cell lineage
Epithelial neoplasm of glandular origin
Benign cyst of apocrine duct origin
Mesenchymal neoplasm of fibrous origin
Which feature makes anal sac adenocarcinoma clinically concerning?
Consistent response to antibiotics alone
Rare involvement of any lymph nodes
Frequent spontaneous complete regression
High local invasion with nodal metastasis
Which multimodal treatment plan is most appropriate for anal sac adenocarcinoma when resection is feasible?
Simple needle drainage without surgery
Topical steroids and warm compresses
Surgical removal followed by chemotherapy
Diet change and probiotic supplementation
Sebaceous cysts form due to which primary process?
Autoimmune attack on sebocytes only
Neoplastic transformation of hair follicles
Impaction and overfilling of sebaceous glands
Infectious colonization by dermatophytes
Which statement about managing sebaceous cysts is most accurate?
Antibiotics alone cure every lesion
All require immediate radical excision
Systemic steroids are first-line care
Some regress after expressing contents
Which diagnostic method directly demonstrates Nocardia organisms from lesion material?
Microscopic demonstration of organisms
Serum antibody titer panels
Thoracic radiography screening
PCR of nasal swab only
A dairy cow shows udder enlargement, edema, and nodules in the udder. Which condition best fits these signs?
Nocardiosis with mastitis presentation
Feline rhinotracheitis infection
Canine parvoviral enteritis
Dermatophytosis of the hoof
Which drug is listed as a treatment option for nocardiosis-associated lesions?
Ivermectin subcutaneous dose
Acyclovir oral tablets
Amphotericin B infusion
Trimethoprim-sulfa administration
Feline herpesvirus-1 has which structural genome characteristic?
Nonenveloped helical negative-sense RNA
Nonenveloped circular single-stranded DNA
Enveloped icosahedral double-stranded DNA
Enveloped polyhedral single-stranded RNA
Which clinical sign set aligns with feline rhinotracheitis?
Sneezing with nasal and ocular discharge
Jaundice with pale mucous membranes
Limb ataxia with hindlimb paralysis
Bloody diarrhea with dehydration
Appropriate initial care for a cat with FHV-1 upper respiratory disease includes which action?
Immediate broad-spectrum antifungals
Prolonged water restriction therapy
Supportive care and high-odor foods
High-dose corticosteroids alone
Canine distemper virus is best described structurally as which type of virus?
Enveloped icosahedral double-stranded DNA
Nonenveloped single-stranded RNA
Enveloped polyhedral single-stranded RNA
Nonenveloped double-stranded DNA
Which sequence best reflects the typical early progression of canine distemper?
Chronic cough then anemia then sudden death
Primary jaundice then polyuria then collapse
Acute diarrhea then seizures then hypothermia
Transient fever then leukopenia then second fever
During the second fever phase of canine distemper, which signs are expected?
Mucopurulent nasal and ocular discharge
Profuse hematuria and stranguria
Generalized pruritus and scaling
Severe icterus and acholic feces
Which gastrointestinal signs can occur in canine distemper cases?
Melena and hematemesis only
Colic and bloat without diarrhea
Constipation and tenesmus predominant
Diarrhea and vomiting with anorexia
What is a reasonable treatment approach for uncomplicated canine distemper?
Antibiotics as sole curative therapy
Supportive care with IV fluids and time
Immediate surgical debridement only
High-dose antifungals as monotherapy
Ringworm in animals is also known by which term?
Pityriasis caused by mites
Dermatophytosis caused by fungi
Eczema caused by allergens
Candidiasis caused by yeasts
Which clinical sign pattern is most consistent with dermatophytosis?
Pustules with honey-colored crusts
Deep ulcerations with hemorrhagic bullae
Circular alopecia with crusts and scales
Miliary dermatitis with severe pruritus
In suspected ringworm, which hair change at lesion margins is typical?
Hair around lesions epilates easily
Hair shafts become hyperpigmented
Hair becomes tightly adherent
Hair lengthens at affected areas
Which statement about ringworm lesion appearance is accurate?
Lesions may lack the classic ring pattern
Lesions always show perfect concentric rings
Lesions never cause any alopecia
Lesions are limited strictly to paw pads
Which environmental source is most associated with Cryptococcus exposure in small animals?
Freshwater fish tanks in households
Decaying leaf litter in deep forests
Pigeon droppings and fowl manure worldwide
Contaminated pond water in rural areas
A cat presents with a swollen, firm nasal bridge called a “Roman nose.” Which disease is most consistent with this sign?
Dermatophytosis involving generalized alopecia
Cryptococcosis affecting the upper airways
Malassezia causing ear pruritus
Sarcoptic mange causing crusted pinnae
Malassezia on healthy skin is best described as which of the following?
Primary pathogen that invades intact skin
Obligate parasite transmitted by insects
Normal flora that becomes opportunistic
Transient contaminant from the environment
Which diagnostic test provides the most definitive identification for hair-associated fungal pathogens in veterinary patients?
PCR testing of epilated hair shafts
Cytology of skin impression smears
Dermatophyte test medium culture
Wood’s lamp fluorescence examination
Which body systems are commonly affected during disseminated cryptococcosis in dogs and cats?
Renal tubules and urinary bladder mucosa
CNS, eyes, skin, and respiratory tract
Pancreas, liver, and endocrine glands
Cardiac valves and peripheral vessels
A pruritic dog has erythematous, greasy otitis externa with numerous yeasts on cytology. Which interpretation is most appropriate?
Normal numbers; no treatment indicated
Non-fungal bacterial contamination
Opportunistic Malassezia overgrowth
Primary Cryptococcus infection
Select the most accurate statement regarding antifungal therapy in small animals.
Short single-dose regimens are universally effective
Fungal infections are often difficult to cure
Topical therapy is avoided whenever possible
Systemic agents are benign with minimal toxicity
Why is Wood’s lamp considered only a tentative aid for diagnosing some fungal infections?
Costs are prohibitive for routine practice
Only about half of cases will fluoresce
Results require several weeks to develop
Test detects bacteria rather than fungi
Which transmission route is typical for Cryptococcus in companion animals?
Ingestion of contaminated standing water
Direct contact with active skin lesions
Transplacental spread from infected queens
Inhalation of environmental yeast spores
A clinician must choose between topical and systemic antifungals for a localized Malassezia dermatitis. Which choice best balances efficacy and safety?
Systemic azoles due to lower liver toxicity
Topical therapy preferred if feasible
High-dose amphotericin B immediately
No treatment because flora are harmless
