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The Central Nervous System "Spinal Cord"
Terms in this set (22)
THE CENTRAL NERVOUS SYSTEM
• extends from foramen magnum -> Le lumbar vertebra
• conducts impulses to/from brain via spinal "tracts"
What does this belong to?
The Spinal Cord
__________contains nerve cell bodies, dendrites, synapses differentiated into anterior and posterior "horns"
__________forms ascending and descending spinal tracts consists of sensory and motor fibers
White Matter (myelinated)
______(leads to 4th ventricle of brain)
pass intervertebral foramen 31 pase pairs; identified by vertebral through through the the region, i.e., "T-8, left"
•dorsal root = sensory nerve entry point "dorsal root ganglion" = sensory nerve cell bodies
• ventral root = motor nerve exit point
__________Is a merging network of spinal nerve trunks leading to and from a specific bodily area
head, neck, upper chest and back
shoulder, arm and hand
lower back, abdomen, genitalia, thigh
buttocks, posterior thigh, calf, foot
protective membranes covering brain/spinal cord is called_________
_______ is dense, irregular connective tissue surrounded externally by blood vessels and fat
The _____________ is made of squamous epithelium and elastic connective tissue, it enclosed honeycombed (subarachnoid) space
vascular areolar membrane supporting blood vessels, closely adherent to the spinal cord and brain
vertical bundles of functionally similar nerves in white matter
Spinal Tracts (Fasciculi)
sensory pathways to various centers in the brain
Ascending Tracts -
• fasciculus gracilis; light touch + muscle position sense in lower body
• fasciculus cuneatus; light touch + muscle position sense in upper body
• spinocerebellar; subconscious muscle sense to the cerebellum -> posture control
Dorsal (crossover at medulla)
spinothalamic; pain and temperature
Lateral (crossover at level of entry)
• spinothalamic; crude touch and pressure
Anterior (crossover at level of entry)
motor pathways from the cerebral cortex and/or the cerebellum
• corticospinal; fine voluntary movement
Pyramidal (crossover at medulla forming pyramids)
involuntary influence on coordination and balance
Extrapyramidal (crossover above medulla)
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