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The spinal cord is divided into four main sections: Cervical: Located in the neck, it controls the arms, shoulders, and neck. Thoracic: Located in the upper back, it controls the chest, abdomen, and back. Lumbar: Located in the lower back, it controls the legs, hips, and pelvis. Sacral: Located in the pelvis, it controls the bladder, bowel, and sexual function. Each section is further divided into segments, and each segment corresponds to a specific area of the body.
Typology: Cheat Sheet
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Abiesha Smith Neuroanatomy Monday, February 13th, 2023
Figure 1 Figure 2 Figure 3
a. In the above spinal cord cross sections, an overall degeneration of the corticospinal tracts of the brainstem can be observed.
Abiesha Smith Neuroanatomy Monday, February 13th, 2023 b. In Figure 1, the lack of staining in the upper leftmost and rightmost regions (near the lateral funiculi) is indicative of demyelination of nuclei in the dorsolateral and anterolateral regions. c. In addition, deterioration of motor neurons can be seen in the anterior horns and rootlets of Figure 2 as well atrophying of the ventral pyramidal region (near the ventral funiculus) which is indicative of a lack of decussation at the corticospinal level. d. Figure 3 further illustrates degeneration of the corticospinal tracts , most specifically in the lateral regions where decreased staining is indicative of axonal and myelin losses.
