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15 Cards in this Set
- Front
- Back
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Why is there an enlargement in the cervical and lumbar areas of the spinal cord?
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To make room for the upper and lower limbs
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How many spinal nerves are there? How are they separated?
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Spinal nerves- 31 pairs
Cervical- 8 Thoracic- 12 Lumbar- 5 Sacral- 5 Coccygeal- 1 |
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what are the main cells that relay information from one area to another area of the CNS?
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Neurons, which makes up the Gray Matter
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what is white matter composed of?
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axonal processes of neurons that travel in groups called tracts
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dorsal funiculi vs ventral funiculi and lateral funiculi
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dorsal funiculi- sensory
ventral funiculi- motor lateral funiculus- mixed |
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fasciculus gracilis tract
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sensory to foot and leg
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fasciculus cuneaus tract
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sensory to arm and hand (concious proprioception, vibration, discriminative touch)
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lateral corticospinal tract
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primary motor tract
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spinothalamic tract
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carries pain, temperature, itch, sex, tickling
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what are the receptors for pain
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naked nerve endings (they are not surrounded by an insulating material called myelin)
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the first order neuron cell body is located where
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dorsal root ganglion
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second order neuron cell body is located where
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dorsal horn of the spinal cord
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where does the second order neuron of the pain and temperature pathway cross over
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crosses at the midline to form the spinothalamic tract
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Where does the spinothalamic tract ascend through
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ascends through the spinal cord, medulla, pons, and terminates in the thalamus
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where does the thalamic neuron terminate
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postcentral gyrus
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