Histo 1

Question 1

Name the 6 (sometimes 7) layers of the GI tract.

Answer 1

Innermost
1. Epithelium
2. Lamina Propria Mucosa
3. Muscularis Mucosa
4. Submucosa
5. Muscularis Externa (both inner circ. outer long)
6. Tunica Adventitia (if no peritoneum)
  or Lamina Propria Serosa
7. (if there is serosa) mesothelium

Question 2

Type of epithelium in the mesothelial layer.

Answer 2

Simple Squamous

Question 3

Name the 4 layers of masticatory mucosa.

Answer 3

1. Epithelium (keratinized and parakeratinized)
2. Lamina Propria (dense CT)
3. Periosteum
4. Bone

(no submucosa or muscle)

Question 4

2 main locations of masticatory mucosa.

Answer 4

1. Gingiva

2. Hard Palate

Question 5

What is the rubor labii?

Answer 5

Division in lining mucosa where the inner lip becomes the outer lip. The epithelium inside in non-keratinized and at this point it becomes keratinized.

Question 6

Describe filiform papillae.

Answer 6

Smallest tongue papillae, no taste buds, only mechanical function. cone-shaped or candle-flame shaped

Question 7

How can you differentiate foliate papillae from fungiform papillae?

Answer 7

Fungiform will often be found individually surrounded by filiform papillae. Foliate are also on the lateral margins of the tongue.

Question 8

Dense connective tissue that connects the root of the tooth to the gingiva and jaw bone.

Answer 8

Periodontal Membrane

Question 9

Cells that line the pulp cavity in a tooth and produce the predentin that will crystalize to become dentin.

Answer 9

Odontoblasts

(have long processes that extend out into the canaliculi of the dentin which supply blood and innervation to dentin

Question 10

Collagen fibers projecting from the cementum and attached to the alveolar bone – form the bulk of the periodontal ligament.

Answer 10

Sharpley Fibers

Question 11

Cells that secrete enamel and the name of the organized rods and fibers.

Answer 11

Ameloblasts

Retzius lines

Question 12

Cell type found in the acinus of a salivary gland.

Answer 12

Simple Cuboidal

can be a mix of serous or mucous

Question 13

Cell type found in the intercalated duct.

Answer 13

Low cuboidal (simple) - secretes bicarb and absorbed Cl-

Question 14

Cell type in the striated duct.

Answer 14

Simple cuboidal that gradually changes to simple columnar

Question 15

Type of cells found in the excretory duct.

Answer 15

Pseudostratified columnar, to stratified cuboidal and columnar

Question 16

Type of Acinus found in the parotid gland.

Answer 16

Only serous

Question 17

Type of acinus found in the submandibular gland

Answer 17

mostly serous

Question 18

Type of acinus found in the sublingual gland

Answer 18

mostly mucous

Question 19

Location of the Meissner Plexus

Answer 19

Submucosa

Question 20

Type of glands in the esophagus.

Answer 20

ALL ARE MUCOUS!

Question 21

Name the 4 types of fundic gland cells and their functions.

Answer 21

1. Parietal Cells - secrete HCl and intrinsic factor
2. Chief Cells - secrete pepsinogen
3. Enteroendocrine Cells - secrete hormones like gastrin
4. Mucous Neck Cells - secrete a soluble mucous and are similar to surface cells.