title: Longitudinal projections of primary afferents from the single dorsal root ganglion of the cervical or lumbosacral enlargements in chickens.
abstract: Central projections originated from a single dorsal root ganglion (DRG) were studied in the chicken focusing on the rostrocaudal extension of primary afferents in each lamina by using anterograde labeling by lectin-HRP injection into either the 15th or the 24th DRG. In the injection into the 15th DRG, labeled fibers (LFs) were found in a wide rostrocaudal range of laminas IV (the spinal segment (SS) 1-20) and V (SS 4-18) and in a narrow range of other laminas. In the injection into the 24th DRG, LFs were distributed in a similar rostrocaudal range in all laminas except for laminas VIII and IX. LFs in laminas VIII and IX were restricted in the tracer injected segment. LFs in the lateral funiculus derived from both the enlargements projected into the rostral lamina III in addition to the lower medulla oblongata. There was little overlap in the extent of the primary terminal areas from both the enlargements.
authors.affiliation: Department of Veterinary Anatomy, Tottori University, Tottori 680-8553, Japan. Electronic address: muehara@muses.tottori-u.ac.jp.
authors.forename: Masato
authors.initials: M
authors.lastname: Uehara
authors.affiliation: Department of Veterinary Anatomy, Tottori University, Tottori 680-8553, Japan.
authors.forename: Yoshinao Z
authors.initials: YZ
authors.lastname: Hosaka
mesh_terms: D000344:Afferent Pathways / Q000502:physiology*; D000818:Animals; D002645:Chickens / Q000033:anatomy & histology / Q000502:physiology*; D005727:Ganglia, Spinal / Q000502:physiology*; D008161:Lumbosacral Region; D008526:Medulla Oblongata / Q000502:physiology; D009333:Neck
keywords: Cervical and lumbosacral enlargements; Chicken; Dorsal root ganglion; Primary afferents; Spinal cord