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Unformatted text preview: Cgsc201 Lec 7 Notes: Movement 19/10/2007 00:53:00 Rostral to caudal Dorsal to ventral Medial to lateral (trunk to extremities) Spinal cord is topographically organized. dorsal horns: sensory (afferent) dorsal horns affected by incoming sensory info ventral horns: motor (efferent) bringing message to muscles, have an effect on them release ACH for transmitter @ neuromuscular junction o ligand gated channels calcium release within muscle muscle contraction once ACH is bound, it gets destroyed rapidly in the cleft site of many poisons interfering with release, or blocking receptors muscle spindle if you contract muscle, afferent stops firing and gets floppy o Golgi tendon organ fires when muscle contracts feedback prevents excessive exertion or inhibition muscle spindles prevent muscle from getting too stretched/relaxed...
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- Fall '07