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Center spinal integrating ventral horns ventral

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Unformatted text preview: large ventral horns ventral gray matter Spinal Cord: Gray Matter Spinal Dorsal Horns Dorsal Incoming unipolar sensory neurons enter and synapse with association neurons neurons Cell bodies of these sensory neurons are in the dorsal root ganglia dorsal horns dorsal lateral horn Lateral Horns Lateral Only visible from T1 to L2 Only Contain autonomic neuron cell bodies Spinal Cord: Structure Spinal Gray commissure Gray posterior median sulcus Connects right and left halves of gray matter matter External fissures External Anterior median fissure fissure Posterior median sulcus anterior median fissure gray gray commissure Spinal Cord: Structure Spinal White matter White Divided into columns called columns or funiculi funiculi Anterior, lateral and dorsal white columns or funiculi lateral funiculus anterior funiculus posterior posterior funiculus Spinal Cord: Structure Spinal Rootlets branch off nearly continuously amd coalesce into amd coalesce about 31 discrete nerves along the cord (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal nerves). coccygeal nerves). Spinal Cord: Structure At each segment, rootlets appear to come out of both the dorsal and ventral halves of the spinal cord, Dorsal roots- going Dorsal going into the cord into Ventral rootsVentral coming out of the of coming the cord the Spinal Cord: Structure Spinal Along the dorsal root is a collection of cell bodies called the dorsal root ganglion. ganglion. Inside the ganglion are the cell bodies of all the receptor neurons that send processes out to the periphery. The free nerve ending in the tip of your finger that feels the paper cut actually has its cell body back in the dorsal root ganglion. Differentiating Levels of the Cord of Overall shape Overall Cervical sections tend to be wide and squashed looking, like an oval. Compare the cervical section to the round lumbar section. Differentiating Levels of the Cord of Ventral horn enlargement enlargement At segments that control a limb, the motor neurons are large and numerous. This causes...
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