Ultrastructural Study on the Intestinal Muscular Coat in Human Beings
- VernacularTitle:成人小肠肌层的超微结构观察
- Author:
Wenqin CAI
- Publication Type:Journal Article
- Keywords:
Intestine;
Smooth muscle;
Nerve;
Interstitial cell
- From:Journal of Third Military Medical University
1983;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
An ultrastructural study was carried out on the muscular coat of human intestine. Special muscle layer(SML), which consisted of 1-6 rows of special muscle cells with the characteristics of smaller volume and more electron density than those of (.he muscle cells of the main component of the circular muscle layer (MCM), was found at the innermost (the mucosal side) of MCM. A space was usually found between the SML and MCM. Numerous nerve fibers were distributed within the connective tissue of the space. The density of nerve distribution and the frequency of varicosities in SML were the highest in the muscular coat of the intestine. A close contact between the axons and the muscle cells was usually found. The density of nerve distribution in MCM was the second and the longitudinal muscle (LM) was poorly innervated. Most commonly the axon was separated from the muscle by a gap over 100 nm in width in MCM and LM. Intermediate junction was present in SML, MCM, and LM, while gap junction could only be observed in MCM, Interstitial cells were seen in the connective tissue septa, and their processes were often in close contact with the muscle cells and axons. In the cytoplasm of the interstitial cells of SML, myofilament-like structure was sometimes found.The ultrastructural features of the muscular coat of human intestine were compared with those found in laboratory animals and the physiological significance of these features was discussed.
