structure of upper GI

Question 1

lining of nasal cavity and airway? Of pharynx and esophagus

Answer 1

pseudostratified columnar with cilia and goblet cells. Stratified non keratinized squamous

Question 2

what do nasal and oral cavities from from? The pharynx, airway and esophagus?

Answer 2

ectodermal invagination (stomodeum). Foregut (splanchnopleure)

Question 3

Layers of most hollow organs

Answer 3

mucosa (simple columnar epithelium, lamina propria, muscularis mucosae), submucosa (with CT, meissner’s plexus), muscularis externa (inner circular and outer longitudinal SM, Auerbach’s plexus), serosa/adventitia (loose CT continuous with mesentery, simple squamous epithelium)

Question 4

acini found in the various salivary glands

Answer 4

sublingual: mucous, Parotid: serous. Submandibular: mixed. Also, intercalated ducts (smaller than acinus) and striated ducts (larger than acinus and pump ions)

Question 5

four kinds of papillae

Answer 5

filiform (pointed, no buds), fungiform (domes with buds), foliate (ridges with buds), circumvallate (on sulcus terminalis with buds and serous von ebner’s glands)

Question 6

epithelium of tongue and oral cavity

Answer 6

strat squamous, keratinized or parakeratinized (nuclei retained)

Question 7

tonsils: what are they? where?

Answer 7

aggregations of lymph nodules (not nodes). Lingual, palatine (with crypts), pharyngeal. All are in the pharynx

Question 8

Composition of esophagus: epithelium, muscle

Answer 8

stratified squamous. Striated upper 1/3, smooth lower 1/3, mixed in middle

Question 9

innervation of pharynx and larynx and esophagus

Answer 9

Vagus Nerve. Branchiomotor (recurrent laryngeal) for striate mm. in pharynx and upper esophagus. Parasymp for SM in rest of fore and midgut.