CMD 377 Lecture Notes - Lecture 10: Superior Cerebellar Peduncle, Grey Matter, Spinocerebellar Tract
11 Mar 2017
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Document Summary
Cmd 377 - lecture 10 - ascending pathways of the spinal cord. The posterior column - medial lemniscus system: organization. Somatotopic organization an organized way of sending information through the body. Cell bodies of the spinal afferent fibers in ipsilateral dorsal root ganglia. When entering the spinal cord, dorsal rootlet segregates into a medial and lateral division. The medial division fibers enter the posterior column. Caudal to t6 forms fasciculus gracilis. Contains sensory information from the lower body/limbs. Rostral to t6 forms fasciculus cuneatus. Contains sensory information from the upper body/limbs. Synapse in nucleus gracilis or nucleus cuneatus in caudal medulla. Second-order fibers arising in the nuclei cross the midline forms the medial lemniscus. Medial lemniscus terminates in the thalamus (ventral posterolateral nucleus, vpl) Third-order fibers ascend through the internal capsule to synapse in the postcentral gyrus. The posterior column - medial lemniscus system: function. Carries information of touch, pressure, vibration, and joint and position movement.
