Localization of somatostatin-like immunoreactive fibres in the trigeminal principal sensory nucleus of the cat.
The location and distribution of nerve fibres and terminals displaying somatostatin-(SOM)-like immunoreactivity (LI) has been examined in cat trigeminal principal sensory nucleus (Vp) using the peroxidase-antiperoxidase technique. The varicose SOM-LI nerve fibres form a fine network in the Vp. SOM-positive terminals are distributed throughout Vp but they are particularly abundant in the ventral subdivision of the nucleus (Vpv). The labelled terminals make predominantly asymmetric axodendritic synaptic contacts. SOM-LI terminals only rarely form symmetrical synapses with non-reactive neuronal elements and are also present free in the neuropil. No SOM-LI perikarya are detected in the Vp. The results of the present study suggest that the majority, if not all, of SOM-LI fibres in the Vp are probably of primary afferent origin and may be involved in relaying trigeminal sensation to neuron located in this brain area.
Lazarov
N
N
Department of Anatomy, Histology, and Embryology, Higher Medical Institute, Stara Zagora, Bulgaria.
Chouchkov
C
C
D000818:Animals; D002415:Cats; D005260:Female; D007124:Immunoenzyme Techniques; D007150:Immunohistochemistry; D008297:Male; D008854:Microscopy, Electron; D009475:Neurons, Afferent / Q000276:immunology / Q000378:metabolism*; D013004:Somatostatin / Q000276:immunology / Q000378:metabolism*; D014278:Trigeminal Nuclei / Q000166:cytology / Q000276:immunology / Q000378:metabolism*
D013004:Somatostatin