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Due to the prominent development of the longissimus (Lo) and the iliocostalis (IC) muscles of the caiman, the pattern of distribution of the spinal nerves in the body wall was unique; there also was less differentiation of the external intercostalis. There were four primary divisions of the spinal nerves in the thoracic region of the caiman, from ventral to dorsal: the intercostal nerve, the IC nerve, the Lo nerve, and the dorsal main trunk. Thus, the classic concept of the organization of the spinal nerves may not be suitable for the caiman. These findings suggest that evolutionary changes in the dorsolateral axial musculature have brought about the rearrangement of the organization of the spinal nerves. In addition, each clearly segmented myotome of the Lo and IC was innervated by more than two segments of the spinal nerves (pluriseg\u2010mental innervation). The manner of formation of the myotome and its innervation is discussed from the viewpoint of comparative and developmental anatomy.<\/jats:p>","DOI":"10.1002\/aja.1001920304","type":"journal-article","created":{"date-parts":[[2005,2,27]],"date-time":"2005-02-27T02:12:25Z","timestamp":1109470345000},"page":"241-256","source":"Crossref","is-referenced-by-count":11,"title":["Arrangement and innervation of the iliocostalis and longissimus muscles of the brown caiman (<i>Caiman crocodilus fuscus<\/i>: Alligatoridae, crocodilia)"],"prefix":"10.1002","volume":"192","author":[{"given":"Gen","family":"Murakami","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keiichi","family":"Akita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tatsuo","family":"Sato","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,22]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"crossref","unstructured":"Akita K.1991aAn anatomical investigation of the muscles of thepelvic outlet in Japanese giant salamander (Megalobatorachus japonicus) with special reference to nerve supply.Anat. 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