The organization of the spinocerebellar tract neurons in the chicken.
The organization of spinocerebellar tract (SCT) neurons in the chicken was studied quantitatively using retrograde wheat germ agglutinin-horseradish peroxidase labelling. The chicken spinal cord was divided into five regions based on the distribution of SCT neurons: the cervical region (the spinal segments [SS], 1-12, which contained 32% of the total number of SCT neurons), the cervical enlargement (SS13-15, 13.4%), the thoracic region (SS16-20, 13%), the thoraco-lumbosacral region (SS21-26, 34.6%), and the posterior lumbosacral region (SS27-30, 7%). Clarke's column was found in two regions, a cervical one (SS12-16) and a lumbar one (SS21-28). The spinal border cells were less numerous and also present in two parts, a cervical one (SS10-15) and a caudal one (SS20-24). SCT neurons of the ventral part of the ventral horn were found in the cervical enlargement and SS16 (lamina VIII), and in the thoraco- and posterior lumbosacral regions (laminae VIII and IX). The ventral marginal nucleus consisted exclusively of SCT neurons but the major and minor marginal nuclei did not contain SCT neurons. In the cervical region most of SCT neurons were observed in the ventral horn, while the central cervical nucleus, which consists of SCT neurons in mammals, was not identified in the chicken.
Yamamoto
M
M
Department of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Tottori, Japan.
Kitagawa
H
H
Imagawa
T
T
Uehara
M
M
D000818:Animals; D002452:Cell Count; D002574:Cervical Vertebrae; D002645:Chickens / Q000033:anatomy & histology* / Q000502:physiology; D008159:Lumbar Vertebrae; D009474:Neurons / Q000166:cytology* / Q000502:physiology; D012447:Sacrum; D013116:Spinal Cord / Q000166:cytology* / Q000502:physiology; D020824:Spinocerebellar Tracts / Q000166:cytology* / Q000502:physiology; D013904:Thoracic Vertebrae; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate
D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate