title: Distribution of substance P-like immunoreactivity in the brain of the elasmobranch Scyliorhinus canicula.
abstract: Immunohistochemical methods were used to study the distribution of substance P in the brain of the small-spotted dogfish (Scyliorhinus canicula). Substance P-like immunoreactive (SP-IR) cell bodies and fibers were widely distributed. In the telencephalon, sparse populations of SP-IR neurons are present in the olfactory bulbs, pallium, and subpallium. In the subpallium numerous SP-IR boutons form unusual coats ("pericellular appositions") on SP-immunonegative neurons. In the diencephalon numerous SP-IR cerebrospinal fluid-contacting neurons are present in the preoptic recess organ and organon vasculosum hypothalami. Numerous SP-IR fibers also run in the hypothalamus, although no immunoreactivity was observed in the habenulo-interpeduncular system. A terminal field of SP-IR fibers is present in the median eminence. In the mesencephalic tegmentum, SP-IR neurons were observed in the Edinger-Westphal nucleus. SP-IR fibers are present at high density in the basal tegmentum, forming a conspicuous tract. In the hindbrain, numerous SP-IR fibers were observed in the isthmal region, the trigeminal descending root, the visceral sensory area and commissural nucleus, and the visceromotor column. SP-IR fibers occur at high density in the substantia gelatinosa of the rostral spinal cord.
authors.affiliation: Department of Fundamental Biology, University of Santiago de Compostela, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Rodriguez-Moldes
authors.forename: M J
authors.initials: MJ
authors.lastname: Manso
authors.forename: M
authors.initials: M
authors.lastname: Becerra
authors.forename: P
authors.initials: P
authors.lastname: Molist
authors.forename: R
authors.initials: R
authors.lastname: Anadon
mesh_terms: D000818:Animals; D001921:Brain / Q000033:anatomy & histology; D001923:Brain Chemistry / Q000502:physiology*; D004284:Dogfish / Q000378:metabolism*; D005260:Female; D007030:Hypothalamo-Hypophyseal System / Q000378:metabolism; D007150:Immunohistochemistry; D008297:Male; D009474:Neurons / Q000378:metabolism; D009479:Neuropeptides / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000378:metabolism; D013116:Spinal Cord / Q000033:anatomy & histology / Q000378:metabolism; D013373:Substance P / Q000276:immunology / Q000378:metabolism*
chemical_list: D009479:Neuropeptides; D018377:Neurotransmitter Agents; D013373:Substance P