![]() The ventral horn contains somatic efferent motor neurons. Medial motor nuclei innervate muscles of the trunk and are found in all spinal segments. Lateral collections of motor neurons, which innervate limb muscle, are seen in segments of the cervical and lumbosacral enlargements. ![]() Motor nuclei are somatotopically arranged. Much of the spinal gray matter is outside of recognizable nuclei. An alternative of method of categorizing gray matter involves defining spinal laminae (below), as opposed to nuclei. The disadvantage of laminae is that, unlike nuclei, laminar boundaries are not evident in normal sections.Voiceover: In this video, I'm gonna talk about Laminae offer the advantage of including all regions of gray matter. In the central nervous system, which is mostly the brainĪnd the spinal cord, there are areas called "gray matter" gray matter, that contain most of the "neuron somas". In the central nervous system are found in the gray matter. ![]() And then there are otherĪreas called "white matter". The central nervous system, is most of the "myelinated axons". Myelinated, so axons thatĪre wrapped in myelin.
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