II. Neurohistological Studies of the Anus Among Japanese:Second Report Nerve Fibers, Nerve Endings and Ganglion Cells in the Intersphincteric Tissue

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The nerve supply of the intersphincteric tissue had two origins.<BR>The first was the extrinsic nerve fibers coming from the pelvic space as the thick bundles which had no nerve cells, while descending outside of the longitudinal muscle they sent many branches toward the longitudinal muscle, especially the connective tissue inside of the longitudinal muscle where intrinsic AUERBACH'S ganglions were not present. Argyrophobe thin fibers in the extrinsic nerve, mainly distributing upper part of this layer, were considered as the autonomic nerve fibers. It was unlikely that argyrophil thick fibers in the extrinsic nerve, which mainly found in the lower part, made terminations.<BR>The second was intrinsic AUERBACH'S plexus. Plexus and ganglions tended to disappear more orally in older subjects, and not to be found after 6 month of age. There were no matured ganglion cells in the newborn. In the anal canal, the ganglions were larger and fewer, and nerve networks of the plexus were larger and irregular than those of the rectum. Around the site where ganglions disappear nerve bundles located between ganglions became very thick, and descending the agangionic region appeared to be free end in the terminations.
日本大腸肛門病学会の論文