The spinal nucleus is composed of three subnucleii: subnucleus oralis (pars orals), subnucleus caudalis (pars caudalis), and subnucleus interpolaris (pars interpolaris). The subnucleus oralis is associated with the transmission of discriminative (fine) tactile sense from the orofacial region. The subnucleus interpolaris is also associated with the transmission of tactile sense, as well as dental pain, whereas the subnucleus caudalis is associated with the transmission of nociception and thermal sensations from the head.
This region is also denoted at sp5 in other neuroanatomical nomenclature.
This nucleus projects to the ventral posterior medial nucleus in the dorsal thalamus. It is marked the expression of leptin receptors, NPY and GLP-1 in the mouse.
^Mercer, Julian G, Moar, Kim M, Findlay, Patricia A, Hoggard, Nigel, Adam, Clare L (1998). "Association of leptin receptor (OB-Rb), NPY and GLP-1 gene expression in the ovine and murine brainstem". Regulatory peptides (Elsevier) 75: 271–278.|accessdate= requires |url= (help)