title: [Demonstration of a 2d LH-RH neurosecretory system in the duck hypothalamus].
abstract: Using immunocytochemical techniques with an anti-LH-RH immuneserum, evidence of two neuronal systems secreting LH-RH has been shown in the Duck hypothalamus. In addition to the previously described system, located in the preoptic nucleus, a second system could be demonstrated in the infundibular nucleus. The perikarya of the infundibular LH-RH producing neurons were significantly smaller than those of the preoptic neurons. On the other hand, under the experimental conditions used, the infundibular system had approximately five times less LH-RH secreting neurons than the preoptic system, and its perikarya appeared less heavily loaded in IR LH-RH. The LH-RH containing axons from both neuronal populations ran down to the external layer of the median eminence, where they ended in close contact with the capillaries of the hypophysial portal system.
mesh_terms: D000818:Animals; D004372:Ducks / Q000033:anatomy & histology*; D005455:Fluorescent Antibody Technique; D007987:Gonadotropin-Releasing Hormone / Q000378:metabolism*; D007031:Hypothalamus / Q000033:anatomy & histology*; D008297:Male; D008473:Median Eminence / Q000033:anatomy & histology; D011301:Preoptic Area / Q000033:anatomy & histology
chemical_list: D007987:Gonadotropin-Releasing Hormone
vernacular_title: Mise en évidence d'un deuxième système neurosécrétoire à LH-RH dans l'hypothalamus du canard.