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Okay back up to the cervical enlargement.
Spinal cord cross section levels. S3 nerves affect the medial buttock area. Cross sectional anatomy of spinal cord. The thoracic and upper lumbar levels have relatively small amounts of grey matter since they innervate the thoracic and abdominal regions.
The lateral grey column is present at 17 levels of the spinal cord specifically through levels t1 l2 sympathetic outflow as well as levels s2 s4 parasympathetic outflow. Spinal cord cross section. Spinothalamic tract the spinothalamic tracts sit within the dorsal horn laminae i iii iv vof the spinal cord.
S4 nerves affect the perineal area. Both these segments are located within the first thoracic vertebra to the first or second lumbar vertebra as the spinal cord ends here and the nerves form the cauda equina. Fasciculi cuneatus and gracilis are both present.
Allows you to note how the corticospinal tract gets smaller and smaller and smaller as we go from superior to inferior levels of the spinal cord. Extending from this circular area are nerve projections. Internal anatomy of the spinal cord in cross sections.
The gray matter is the core and ends up to be four projections that are known as horns. S2 nerves affect the backs of the thighs. And we re ready to move on now to look at the thoracic cord.
Most of the fibres cross the midline at or near the level they enter the spinal cord. The lateral horn is present from t1 l2. Five bones that are fused together make up the triangle shaped sacrum and these bones are numbered s 1 to s 5.
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