The spinocervical tract

Llewellyn-Smith et al. (1992, 1998) examined the inputs to sympathetic preganglionic neurons. They detected enrichment of Glu in about two-thirds of the terminals contacting sympathoadrenal neurons and in about half of the terminals contacting neurons which project to the superior cervical ganglion. Most of the remaining terminals were immunoreactive for GABA. 

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Fig. 4. Drawing of the spinal cord depicting pathways and neurons likely to use glutamate as a neurotransmitter. I = primary afferent fibers 2 = local-circuit neurons in the superficial dorsal horn 3 = corticospinal fibers 4 = bulbospinal input to the intermediolateral nucleus 5 = vestibulospinal input to the central cervical nucleus 6 = the spinocervical tract. For further details, see Section 3.2.

The spinocervical tract terminates before reaching the brainstem and will therefore be included in this section. Other somatosensory pathways will be included in the sections below. 

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