Osservazioni immunoistochimiche su componenti del sistema nervoso intramurale del solco reticolare di agnello lattante.

The aim of this study was to investigate the presence and distribution of nitric oxide synthase (NOS) and substance P neuropeptide (SP) in the intramural nervous structures of the reticular groove in the suckling lamb. Tissue sections were stained by immunohistochemical methods. NOS and SP-immunoreactive nerve cell bodies and fibers were found in the entire extent of the reticular groove. Nitrergic neurons and fibers were more numerous in the ventral part of the reticular groove, in particular in its floor. SP-immunoreactive nerve fibers and cells, on the contrary, were more concentrated in the lips of the reticular groove.