324Lecture16 digestive tract

324Lecture16 digestive tract - Digestive Tract Part II...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Digestive Tract Part II
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Esophagus Esophagus - about 10 in. long; function: transportation - swallowing. a) mucosa - epithelium - non-cornified stratified squamous epithelium. - lamina propria - glands present at lower end = Cardiac Glands (shallow esophageals). - Muscularis mucosa present.
Background image of page 2
Esophagus b) submucosa - coarse areolar; forms thick folds giving esophagus a star shape. Deep esophageal glands present in lower ½. (ONE OF ONLY THREE PLACES IN THE BODY WHERE SUBMUCOSA HAS GLANDS) c) muscularis externa - mixed tissues; upper 1/3 is skeletal, middle 1/3 mixed smooth/ skeletal, lower 1/3 smooth muscle. Provides for the initiation of the swallowing wave. d) adventitia - areolar CT.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Upper esophagus
Background image of page 4
Stomach Not a simple sac-like structure as imagined - Sphincters (swollen muscle bodies) at both ends controlling back-flows. Food enters stomach as clumpy bolus and leaves as a white, semi-liquid chyme. Stomach wall is thrown into prominent longitudinal folds produced by the submucosa = rugae, grinding devices, allows for expansion/ stretching. Long gastric glands of the stomach are housed in the lamina propria.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Stomach Stomach Regions: a) Cardiac stomach b) Fundic stomach c) Pyloric stomach. Cardiac Stomach: upper stomach, very small region; Separated from esophagus by the Cardiac Sphincter.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cardiac Stomach Mucosa: epithelium - simple columnar epithelium, cells are short-lived - 4-6 days, constantly replaced; form gastric pits. Cardiac glands are mucous secreting; some parietal cells are present. Lamina propria - house cardiac glands. Muscularis mucosa Submucosa - begin to form rugae. Muscularis Externa - a third inner, oblique layer appears; contributes to cardiac sphincter formation. Serosa - no significance
Background image of page 8
Fundic Stomach Major anatomical and functional stomach region. Mucosa - epithelium - as above; gastric pits shallow;
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/04/2012 for the course BIO 324 taught by Professor Crawford during the Spring '09 term at Western Kentucky University.

Page1 / 33

324Lecture16 digestive tract - Digestive Tract Part II...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online