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You are watching: In the spinal cord, white matter is separated into ascending and descending tracts organized as

Purves D, Augustine GJ, Fitzpatrick D, et al., editors. Neuroscience. 2nd edition. Sunderland (MA): Sinauer Associates; 2001.

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The setup of gray and white issue in the spinal cord is relativelysimple: The internal of the cord is created by gray matter, which is surrounded bywhite matter (Figure 1.11A). In transversesections, the gray matter is traditionally divided into dorsal (posterior) lateraland ventral (anterior) “horns.” The neurons of the dorsal hornsreceive sensory information that beginning the spinal cord via the dorsal roots of thespinal nerves. The lateral horns are current primarily in the thoracicregion, and contain the preganglionic visceral engine neurons that job to thesympathetic ganglia (see number 1.10C). Theventral horns consists of the cabinet bodies of motor neurons that send axons via theventral root of the spinal nerves to end on striated muscles. The whitematter of the spinal cord is subdivided right into dorsal (or posterior), lateral, andventral (or anterior) columns, every of which has axon tracts associated tospecific functions. The dorsal columns bring ascending sensory info fromsomatic mechanoreceptors (Figure 1.11B). Thelateral columns incorporate axons that travel from the cerebral cortex to contact spinalmotor neurons. This pathways are also referred to as the cortico-spinaltracts. The ventral (and ventrolateral oranterolateral) columns carry both ascendinginformation about pain and temperature, and descending engine information. Somegeneral rules of spinal cord company are (1) that neurons and axons thatprocess and also relay sensory info are uncovered dorsally; (2) the preganglionicvisceral engine neurons are uncovered in an intermediate/lateral region; and also (3) thatsomatic engine neurons and axons are discovered in the ventral part of the cord.

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Figure 1.11

Internal framework of the spinal cord. (A) Transverse part of thecord in ~ three different levels, mirroring the characteristic arrangementof gray and also white matter in the cervical, thoracic, and lumbar cord. (B)Diagram of the inner structure that (more...)

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