Burns G A
Department of Veterinary Anatomy, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853.
Cornell Vet. 1992 Apr;82(2):187-212.
At several locations along the equine cecum and colon, the outer longitudinal portion of the tunica muscularis is gathered into discrete bands of smooth muscle and connective tissue called "teniae". In this study, the disposition of the teniae ceci and coli was traced along the equine intestinal tract. It was discovered that, in several instances, arrays of teniae converge toward the valves and sphincters which separate the various intestinal compartments. The teniae may also provide support for and directionality to, peristaltic contraction waves. The tissue proportions of the teniae vary in different locations. The tenia libera lateralis of the ventral colon is rich in elastic connective tissue, while that of the right dorsal colon is primarily composed of smooth muscle. This may reflect the different responsibilities of these two compartments. The teniae are innervated and their smooth muscle cells are joined by many gap junctions. The connective tissue constituents afford intestinal support while yielding to intestinal distension. The smooth muscle and neural elements may foster active tenial participation in peristalsis. This premise must be tested by electrophysiological experimentation. Further experimentation is also necessary to ascertain whether injury to the teniae might predispose a horse to colic.
在马的盲肠和结肠的几个部位，肌层的外侧纵行部分聚集成离散的平滑肌和结缔组织带，称为“结肠带”。在本研究中，沿着马的肠道追踪了结肠带和结肠系膜带的分布情况。研究发现，在某些情况下，结肠带的排列朝向分隔各个肠段的瓣膜和括约肌汇聚。结肠带还可能为蠕动收缩波提供支撑和方向性。结肠带的组织比例在不同位置有所不同。腹侧结肠的外侧游离结肠带富含弹性结缔组织，而右背侧结肠的则主要由平滑肌组成。这可能反映了这两个肠段的不同职责。结肠带接受神经支配，其平滑肌细胞通过许多缝隙连接相连。结缔组织成分在为肠道提供支撑的同时，能适应肠道扩张。平滑肌和神经成分可能促进结肠带积极参与蠕动。这一前提必须通过电生理实验来验证。还需要进一步的实验来确定结肠带损伤是否会使马易患绞痛。
