Lesson 13 Objectives - Lesson 13 Objectives 1 Describe the...

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Lesson 13 Objectives 1. Describe the gross and microscopic structures and functions of the spinal cord. 2. Distinguish between flaccid and spastic paralysis. 3. Describe spinal cord development and the homeostatic imbalance spina bifida.
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1. Describe the gross and microscopic structures and functions of the spinal cord. Gross Anatomy and Protection Enclosed by the vertebral column , \spinal cord extends from foramen magnum to 1st or 2nd lumbar vertebra Spinal Cord is a major reflex center Spinal reflexes are initiated and completed at the spinal cord level It is protected by bone , meninges , and cerebrospinal fluid . The single-layered dura mater is not connected to the vertebral bone. The epidural space , a soft padding of fat and network of veins, lies between the dura mater and vertebra . The subarachnoid space (between pia arachnoid and pia mater ) is filled with cerebrospinal fluid These membranes extend well beyond the end of the spinal cord. Lumbar punctures are performed here to withdraw spinal fluid. Inferiorly, the spinal cord terminates at the tapering, cone-shaped structure called the conus medullaris . Extending from the conus is the fibrous filum terminale . It anchors to the coccyx and stabilizes the spine Saw-toothed shelves of pia mater called denticulate ligaments secure the spinal cord to the dura mater Cervical and lumbar enlargements exist where the nerves serving upper and lower limbs arise. 31 pairs of spinal nerves exit the vertebral column through the intervertebral foramen. The cauda equina is a collection of nerve roots at the base of the vertebral column
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1. Describe the gross and microscopic structures and functions of the spinal cord.
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  • Fall '10
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