title: Calbindin D-28k- and substance P-immunoreactive primary sensory neurons: peripheral projections in chick hindlimbs.
abstract: The peripheral projections of two distinct subpopulations of primary sensory neurons, expressing either calbindin D-28k or substance P, were studied in chick hindlimbs by immunodetecting calbindin D-28k with a rabbit antiserum and substance P with a mouse monoclonal antibody. Calbindin D-28k-immunoreactive axons provided an innervation restricted to specific mechanoreceptors such as muscle spindles, Herbst and Merkel corpuscles, or collars of feather follicles but were absent from Golgi tendon organs. In contrast, substance P-positive axons spread out diffusely in muscles and skin, formed loose plexuses, and extended free branches to the endomysium, arteries, superficial dermis, or dermal pulp of feather follicles. The present results show that calbindin D-28k- and substance P-immunoreactive primary sensory neurons provide distinct modes of innervation to selective targets in peripheral tissues. The results suggest a possible correlation between CaBP-expressing nerve endings and rapidly adapting mechanoreceptors.
authors.affiliation: Institut d'Histologie et d'Embryologie, Faculté de Médecine, Université de Lausanne, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Duc
authors.forename: I
authors.initials: I
authors.lastname: Barakat-Walter
authors.forename: B
authors.initials: B
authors.lastname: Droz
mesh_terms: D000344:Afferent Pathways / Q000033:anatomy & histology; D000818:Animals; D064026:Calbindins; D002645:Chickens / Q000378:metabolism*; D006614:Hindlimb / Q000294:innervation*; D007150:Immunohistochemistry; D009469:Neuromuscular Junction / Q000737:chemistry; D009475:Neurons, Afferent / Q000737:chemistry*; D017933:Peripheral Nervous System / Q000033:anatomy & histology*; D064030:S100 Calcium Binding Protein G / Q000032:analysis*; D012867:Skin / Q000294:innervation; D013373:Substance P / Q000032:analysis*; D013710:Tendons / Q000294:innervation
chemical_list: D064026:Calbindins; D064030:S100 Calcium Binding Protein G; D013373:Substance P