Histology Lab-Oral Cavity Flashcards
What type of salivary glands are constitutionally active?
Minor salivary glands
Identify the structures indicated below.
This is the outside surface of the lip. 1) Hair follicle 2) Sebaceous gland 3) Skeletal muscle
Which side of the lip is this?
Lumenal side. Note the non-keratinized stratified epithelium.
Identify the different structures indicated below
This is a section from labial glands in the lip. 1) Acini 2) Duct of gland 3) Excretory duct
Identify the different structures indicated below.
1) Tongue 2) Tooth 3) Lens of eye 4) Olfactory bulb 5) Nasal septum
How does the tooth enamel and pulp develop?
Enamel is made by ameloblasts which are derived from epithelium. Dentin is made by odontoblasts which are derived from the connective tissue.
Identify the different structures indicated below.
This is a tooth. 1) Pulp 2) Odontoblasts 3) Predentin (light area) & Dentin (dark area) 4) Incomplete enamel 5) Ameloblasts
What are the structures indicated by the stars below?
Highly keratinized filiform papillae of the tongue
What structure is indicated below?
Minor salivary glands in the tongue. Note the fungiform and filiform papillae located apically on the tongue.
What type of glands do you see in the image below?
This is a slice of circumvallate papilla. Glands in this area are more serous compared to the more mucous glands in the minor salivary glands.
What structures are included in the circled area below?
This is neuroepithelium in a taste bud. Sustentacular cells, basal cells and the receptor that sends signals to the olfactory bulb are located in this area.
What structure is shown below?
Neuroepithelium in a taste bud.
What structures are indicated below?
Foliate papillae and taste buds. Note that they are located on the side as the circumvallate papillae are.
What structures are indicated below?
Lingual tonsils. Note the lymphoid tissue.
What is meant by striated salivary ducts?
They have mitochondria lined up in each cell due to intense pumping activity
What type of acini are found in the image below?
Serous (more pink and round) and mucous (less pink w/ nuclei at base) acini. This is a submandibular gland which has a good mix of both.
What are the light areas seen in the section from the parotid gland below?
Fat cells. Serous glands are the only ones found in the parotid gland.
Why is this salivary gland so light?
It is the sublingual gland which consists mostly of mucous acini. Note how strongly PAS stains the mucous acini pink.
What structures are indicated below?
1) Esophagus 2) Trachea 3) Thyroid
What are the different layers indicated below?
This is a section from the esophagus w/ stratified squamous non-keratinized epithelium. 1) Mucosa 2) CT submucosa 3) Mucularis externa (w/ inner circular and outer longitudinal layer w/Auerbach plexus between the two) 4) Adventitia
What type of glands do you find in layer 2 shown below?
This is a section from the esophagus, note the stratified squamous epithelium with mucous glands in the submucosa. This is distinguishing of the esophagus.
What structures are indicated below?
1) Muscularis mucos 2) Auerbach plexus between two layers of muscularis externa
What region of the GI tract is shown below?
GE Junction. Note the change from stratified squamous non-keratinized esophageal epithelium to simple columnar epithelium of the stomach.
What structure is indicated below?
Gastric ruga
What layers of the stomach are shown below?
1) Pit, mostly mucous cells 2) Isthmus, contains stem cells 3) Glands, w/ chief and parietal cells. Note that it is the same epithelium going all the way down.
What region of the stomach is shown below?
Pyloric. Note that the pit is longer and the gland is shorter in this region compared to the body of the stomach.
Where are the parietal and chief cells in the gland?
Parietal cells are only located in the glands. Chief cells are located deeper.
What is the function of the cells indicated below?
Enteroendocrine cells in the pyloric glands. Note that they sense changes in the lumen and then release their content through the base into the blood to modify digestion.
