NSC 4366 Lecture Notes - Lecture 1: Afferent Nerve Fiber, Ventral Anterior Nucleus, Spinal Nerve

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29 Aug 2015
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Each spinal nerve carries sensory info from a separate body surface to spinal cord. Dorsal root strand of nerve fibers; afferent fibers entering dorsal (posterior) part of the spinal cord bring information to the sensory receptors and coverage here as they enter the spinal cord. Ventral root efferent fibers leaving ventral anterior part of the spinal cord carrying information from the spinal cord to the muscles form this similar strand of spinal nerves. Dorsal horn site of termination of afferent neurons and origin of ascending pathways. Ventral horn contains motor neurons that innervate skeletal muscles. Lateral horn contains preganglionic neurons belonging to sympathetic ns. Intervertebral foramina small holes in the vertebral canal that the spinal nerves leave through. Cauda equina leash-like arrangement of the lumbar and sacral spinal nerves. Ascending tracts-trunk/limbs to the brain: dorsal columns. Fine touch and proprioception: spinocerebellar tracts. Info from muscles and joints receptors to the cerebellum: spinothalamic tracts.

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