Oral Embryology and Histology Review

Hard tooth surfaces, including enamel and dentin, develop during which stage of tooth formation?

• Cap stage

• Bell stage

• Bud stage

• Maturation stage

The enamel organ, dental papilla and dental follicle collectively form one unit referred to as the:

• Tooth germ

• Preameloblast

• Ameloblast

• Lamina dura

Anatomic features of the oral cavity have many unique naming and reference systems. Which of the following is a correct statement?

• In the oral cavity, the midsagittal plane is called the midline, or median line-of-separation

• The permanent premolars are considered nonsuccedaneous

• In the universal numbering system, the mandibular left second molar is number 31

• The first teeth to erupt in the oral cavity are usually the deciduous maxillary central incisors

Which of the following epithelial tissues surrounding the tooth is nonkeratinized?

• Inner surface of the free gingival margin

• Outer surface of the free gingiva

• Papillae

• Attached gingiva

Endoderm, mesoderm, and ectoderm are the three primary layers formed early in embryonic development. The ectoderm layer differentiates into each of the following EXCEPT one. Which is the EXCEPTION?

• Skin

• Nails

• Brain

• Circulatory System

• Hair

Red blood cells, most white blood cells, and platelets are produced in the:

• Cardiovascular system

• Bone marrow

• Skeletal system

• Corpuscle

During embryonic development the primitive mouth is called the

• Frontonasal process

• Stomodeum

• First pharyngeal arch

• Foregut

• Mandibular pharyngeal arch

The type of epithelial tissue that is found in the oral cavity is called:

• Stratified squamous epithelium

• Simple columnar epithelium

• Simple cuboidal epithelium

• Pseudo-stratified columnar epithelium