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26 Cards in this Set
- Front
- Back
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Where does the spinal cord begin and end
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foramen magnum; btw 1st and 2nd lumbar vert
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How many cord segments are there?
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31: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
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Spinal meninges
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Dura: outermost, tough
Arachnoid: spider-like Pia: thin, completely surrounds and adheres to cord. Denticulate ligaments and filum terminale are extentions of pia |
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Subarachnoid space
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btw pia and arachnoid and filled w/ cerebrospinal fluid
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epidural space
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btw dura and periosteum, filled with loose connective tissue, fat, and internal vertebral venous plexus
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Where are the dorsal root ganglia located
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Intervertebral foramen
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What are the 1st branches off the spinal nerve
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dorsal/ventral primary rami
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How is the white matter divided
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3 funiculi with subdivisions of fasciculi (tracts)
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What is contained in the dorsal horns
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sensory neuron cell bodies
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What is contained in the ventral horns
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Voluntary movement cell bodies
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Lateral horns
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In T1-L2, preganglionic neurons cell bodies of the sympathetic nervous system
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What happens to the relative amount of white matter in the S.C. superiorly to inferiorly
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It decreases
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Which region/s of the SC have the most gray matter
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The cervical swelling (C5-T1) and sacrolumbar swelling b/c they serve the limbs
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What does the SC connect to after it passes upward through the foreman magnum
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medulla oblongota
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conus medullaris
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tip of SC (L1-2)
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cauda equina
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dorsal and ventral roots that haven't yet formed a spinal nerve. Come off at S1
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dural sac
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ends at S2. Importance is that inside of the dura, the arachnoid mater also ends at S2
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lumbar puncture
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Withdrawl of cerebrospinal fluid from subarachnoid space. Done anywhere below L2 (b/c spinal cord ends)
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dorsal primary rami supply ________________ (2)
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deep back muscles and cutaneous nerve skin of the back
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Ventral primary rami supply _______________
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muscles of thorax or abdomen body wall, and also limbs
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Greater occipital nerve
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Primary rami of C2. Innervate back of head
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Dermatomes
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area of SKIN innervated by a spinal nerve. Sensory, but the underlying muscles are sharing the same nerves
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What are the 4 plexus? What type of nerve are they formed by?
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Cervical, brachial, lumbar, sacral; formed only by anterior primary rami
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Add'l spinal cord functions (3)
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relay info to/from brain
spinal reflexes ANS origins |
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Blood supply to spine
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Anterior spinal artery (1)
Posterior spinal artery (2-4) Anastomose with radicular arteries |
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Venous drainage
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to vertebral venous plexus. Easy way for cancer cells to spread and metastasize
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