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Functions of the Cord - Gross Anatomy medullary cone-taper...

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Spinal Cord Functions of the Cord * Conduction * contains bundles of nerve fibers that conduct information up and down the cord * Locomotion - control of repetitive coordinated contractions of several muscle groups in the limb * consist of central pattern generators- CPG are neural circuits that produce self-sustaining patterns of behavior without sensory input (Examples: locomotion, respiration, mastication). Gross Anatomy * extends from foramen magnum to L1 * averages 1.8 cm thick and 45 cm long * gives rise to 31 pairs of spinal nerves * divided into cervical, thoracic, lumbar, and sacral regions Different Levels of Spinal Cord Control * Cervical - neck, shoulder, outer arms, hand * Thoracic -inner arm, chest, abdomen * lumbar - front of leg and foot * Sacra l- back of leg and foot Gross Anatomy * cervical enlargement- (C3-T2) gives rise to nerves of the upper limb * lumbar sacral enlargement (T9-T12)- give rise to nerves of the pelvic region and lower limbs Cervical & Lumbar Enlargement
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Unformatted text preview: Gross Anatomy * medullary cone-taper of the distal cord * cauda equina-bundle of nerves originating from the lumbar and sacral cord * Terminal filum-fibrous continuation of the cord beyond the medullary cone * consists of pia mater and neuroglial elements . * s a vestige of the spinal cord of the embryonic tail , but in the adult it has no functional significance . Cauda Equina and Terminal Filum Cauda equina with conus medularis and terminal filum Cauda Equina Meninges of the Spinal Cord * three fibrous membranes that encloses the cord * dura mater-tough outer covering * epidural space-between vetebrae and dura mater, contains blood vessels and adipose tissue * subdural space- space between dura and arachnoid mater * arachnoid mater * subarchnoidl space-contains CSF * pia mater-translucent membrane that close contours the cord and forms the terminal filum beyond the medullary cone Spinal Cord...
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