Kinesiology 2222A/B Lecture Notes - Lecture 5: Cranial Nerves, Spinal Nerve, Posterior Cord

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Cns sits within a bony cage for protection (injuries are more severe than injuries to the pns) Pns is less protected as it travels to the periphery . Afferent info travels to cns to provide feedback about environment. Efferent info travels from cns to control environment. Ex. skeletal muscle, sensory neurons in skin. Somatic sensory info from periphery (skin, limbs) Autonomic/visceral motor control of smooth & cardiac muscle, and glands, sympathetic/parasympathetic. Composed of brain & spinal cord (sc) Similar organization of cells, but slightly different. Grey matter = nerve cell bodies (neurons), dendrites, axon terminals & non-myelinated nerve fibers. White matter = myelinated nerve fibres/axons (no neurons or cell bodies) (myelin is white) Grey matter is on the outside of brain (mostly), but in the middle of the spinal cord (h-shaped) Extends from foramen magnum to l2 vertebrae. Conus medullaris = cone shaped termination of spinal cord. Cauda equina = bundle of spinal roots that hang off the conus.

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