Histology Lab

A&P I Lab 4
Muscle Histology &
Bones/Muscles of Upper Limb

How This Unit Works

​Muscles & Bones are Learned Together
Focus on Body Regions (Upper Limb, Trunk, Lower Limb)
Bone Box is in the Library for Studying.

• Striations - from sarcomeres

• Full of myofibrils

• Nuclei is pushed to the side

• Innervated by an NMJ (but they don't touch)

• Many synapses. Each bouton forms a synapse but the who area is the NMJ.

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​Muscle Histology

Muslce Cell Model

This is not on your worksheet but WILL be on your practical. Take a moment to look at it!

• Sheaths of epimysium and perimysium from muscle extend to form tendon

• Not all muscles have a tendon (some weave right into the periosteum of the bone)

• On the right - the lighter pink is the tendon, the darker pink is the muscle

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​Tendon Histolgy

• Chemical synapse between motor neuron and skeletal muscle fibers

• one NMJ is many boutons. one bouton is one synapse

• Our slides are not good - but out for you to see

NMJ

• Skeletal muscle has nuclei pushed to sides, striated, multinucleate, long cells, vascular

• Tendon is DRCT (different from DICT) and is densly packed with collagen, are avascular

​​Muscle/Tendon

​HISTOLOGY Overview

Multiple Choice

Which of the following is true of tendon tissue?

• Composed of DRCT

• Composed of DICT

• All muscles have a tendon associated with them.

• Multinucleate

Multiple Select

Which of the following is true about an NMJ? Check all that apply

• A chemical synapse

• Junction of an axon and a muscle

• Use ACh

• Only one per axon

​Humerus

​Radius & Ulna

​Carpals, Metacarpals & Phalanges

• Some Lovers Try Positions That They Can't Handle

• Scaffoid, Lunate, Triquetrium, Pisiform, Trapezium, Trapezoid, Capitate, Hamate

Now we will learn about:

• Deltoid

• Brachialis

• Triceps

• Coracobrachialis

• Biceps

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​Muscles of Brachial Region

​D

​Br

​T

C

​Bi

​Bi

​T

• Pronator Teres

• Flexor Carpi Ulnaris

• Flexor Carpi Radialis

• Flexor Digitorum Superficialis

• Palmaris Longus

• Extensor Carpi Ulnaris

• Extensor Carpi Radialis

• Extensor Digitorum

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Muscles of the Antecubital & Antebrachial Regions

​PT

​FCR

PL

​FCU

​FDS

​ECU

​ECR

​ED

​Movements

Use your lab manual or the text on the table to learn different body movements. This will be a quiz/sign-off station.

​Anatomage Table

Take a few moments to look at the upper limb muscles and bones on the anatomage table. This is not on your worksheet but will be on your practical and will be used for future worksheets.

If you want to see your practical, see instructor at end of lab