GI System Intro - Unit 2
Layers of tubular GI organs
The dog jejunum on glass slide 160 is particularly advantageous for understanding the concentric layers in the tubular organs of the GI system. Be able to identify the following structures:
Tunica mucosa
epithelium and mucosal glands
lamina propria (loose c.t.)
muscularis mucosae - smooth muscle
tunica submucosa (loose c.t.)
submucosal glands (not present here)
submucosal plexus (autonomic ganglia)
tunica muscularis
inner circular smooth muscle
outer longitudinal smooth muscle
myenteric plexus
tunica serosa/adventitia
Remember that some of the structural elements listed above vary in occurrence and/or quantity, depending upon the organ and species of animal being studied. One should be continually cognizant of the presence of the vasculature and innervation of any tissue or organ under study.
Slides:
#140 Parotid gland - canine
#141 Mandibular gland - canine
#160 Jejunum - canine
#150 Esophagus - canine
#149 Abomasum from a goat
#151 Esophageal-cardiac junction - canine
#152 Cardiac stomach - porcine
#154 Pyloric stomach - porcine
#155 Bovine rumen
#156 Bovine reticulum
#157 Bovine omasum
Gasterointestinal system Terms:
buccal glandsconical papillae
stellate reticulum
tongue
taste pore
hypoglossal nerve
filiform papillae
fungiform papilla
foliate papillae
taste buds
vallate (circumvallate) papillae
gustatory glands
parotid gland
serous demilune
serous glands
acinus
serous acinus
mucous acinus
mucoserous (mixed) acinus
striated (secretory) salivary ducts
Intercalated ducts
interlobular (non-secreting) duct
myoepithelial cells
mandibular gland
tunica submucosa
tunica mucosa
tunica muscularis
tunica serosa/adventitia
muscularis mucosae
esophagus
stomach
gastric pit
gastric gland
esophageal-cardiac junction
cardiac stomach
fundic stomach
mucous neck cells
parietal cells
chief cells
enteroendocrine cells
pyloric stomach
rumen
papillae (of the rumen)
reticulum
omasum
duodenum
submucosal tubuloacinar (Brunner's) glands
paneth cells
goblet cells
jejunum
villi
lacteals
ileum
M-cell
myenteric plexus (of Auerbach)
submucosal plexus (of Meissner)
large intestine
intestinal crypts
simple tubular intestinal glands (in intestinal crypts)
cecum
taeniae ceci
anal glands
anal sac
circumanal glands
internal anal sphincter
perisaccular glands
rectum
perianal sinus
hepatoid (deep) glands
sudoriferous glands
superficial sebaceous glands
anal sphincter