Sarna S K
Department of Surgery, Medical College of Wisconsin, Milwaukee.
Am J Physiol. 1993 Jul;265(1 Pt 1):G156-64. doi: 10.1152/ajpgi.1993.265.1.G156.
The patterns of longitudinal muscle contractions of the stomach and the small intestine and their relationship with circular muscle contractions during the fasting and the fed state were investigated in conscious dogs. In the stomach, the longitudinal muscle contracted in a 1:1 relationship with the circular muscle contractions. There was no significant difference between the frequency, duration, and time of onset of gastric longitudinal and circular muscle contractions, and their amplitudes were significantly correlated with each other. In the small intestine when the circular muscle contracted, the longitudinal muscle exhibited passive elongation during the fasting and the fed state. There was no significant difference between the onset, duration, and frequency of small intestinal circular muscle contractions and the passive longitudinal muscle elongations; their amplitudes were strongly correlated with each other. During a circular muscle giant migrating contraction, the longitudinal muscle exhibited a monophasic contraction, initially a contraction followed by passive elongation or a pure passive elongation. During a retrograde giant contraction, the longitudinal muscle exhibited only a pure monophasic contraction or a contraction-elongation complex. These data suggest that the enteric nerves in the small intestine innervate the two muscle layers in a reciprocal fashion and those in the stomach in a complementary fashion.
在清醒犬中研究了禁食和进食状态下胃和小肠纵行肌收缩模式及其与环行肌收缩的关系。在胃中，纵行肌与环行肌收缩呈1:1关系。胃纵行肌和环行肌收缩的频率、持续时间和起始时间无显著差异，且它们的幅度显著相关。在小肠中，当环行肌收缩时，禁食和进食状态下纵行肌均表现为被动伸长。小肠环行肌收缩和纵行肌被动伸长的起始、持续时间和频率无显著差异；它们的幅度高度相关。在环行肌巨大移行收缩期间，纵行肌表现为单相收缩，最初是收缩随后是被动伸长或单纯被动伸长。在逆行性巨大收缩期间，纵行肌仅表现为单纯单相收缩或收缩-伸长复合体。这些数据表明，小肠中的肠神经以相互的方式支配两层肌肉，而胃中的肠神经以互补的方式支配。
