Organization of motoneurons innervating the axial musculature of the brown caiman (Caiman crocodilus fuscus)
✍ Scribed by Dr. Gen Murakami; Tadashi Nakasone; Keiichi Akita; Yutaka Kato; Iwao Sato; Kazuyuki Shimada
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 1017 KB
- Volume
- 221
- Category
- Article
- ISSN
- 0362-2525
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The primary divisions of the spinal nerve in the brown caiman characteristically show the following features: (1) the medial ramus was lies in the thoraco‐lumbar and caudal regions, and (2) the first cervical and hypoglossal nerves form a single nerve complex from which the ventral and dorsal rami extend. Intramuscular injections of horseradish peroxidase (HRP) established the positions of motoneurons whose axons followed the primary rami. In the ventral horn of the thoracic and caudal spinal cord, the motoneurons of the medial ramus lie ventrally. These motoneurons lie between the epaxial and hypaxial motoneurons. At the spinomedullary junction, the pools of motoneurons innervating the infrahyoid, lingual, and dorsal muscles have a somatotopic organization similar to that observed in the thoraco‐lumbar and caudal regions. Thus clear somatotopic organization of the motoneurons that innervate the axial musculature exists at all spinal levels. © 1994 Wiley‐Liss, Inc.