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Small Intestine - Anatomy & Physiology (view source)
Revision as of 09:43, 17 July 2008
, 09:43, 17 July 2008→Histology
**''paneth'' at the base of the crypt. Function unknown. Contain eosinophilic granules.
**''paneth'' at the base of the crypt. Function unknown. Contain eosinophilic granules.
*Lamina muscularis is smooth muscle.
*Lamina muscularis is smooth muscle.
*'''Brunner's glands''' are present in the submucosa of the '''duodenum'''.
*'''Brunner's glands''' are present in the submucosa of the '''duodenum'''.
**Secrete a protective mucous.
**Secrete a protective mucous.
**Produce an alkaline secretion which neutralises stomach acid.
**Produce an alkaline secretion which neutralises stomach acid.
**Open into the crypts in the mucosa above.
**Open into the crypts in the mucosa above.
**Contraction of smooth muscle shortens the villus. This helps to pump out absorbed products of digestion. Relaxation of smooth muscle lengthens the villus which increases surface area, facilitating absorption.
*Submucosa is loose connective tissue and it contains blood vessels and nerve fibres.
*Tunica muscularis is smooth muscle.
*Tunica muscularis is smooth muscle.
**It consists of two muscle layers (see regulation & control).
**It consists of two muscle layers (see regulation & control).