Anatomy Midterm 2 - Lecture 2.docx

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Department
Anatomy and Cell Biology
Course
Anatomy and Cell Biology 3319
Professor
Michele Barbeau
Semester
Winter

Description
Spinal Nerves and Brachial Plexus ­ Sacrum and coccyx are immobile due to them being fused ­ Thoracic look like giraffes ­ Lumbar look like moose ­ protects spinal cord from damage ­ 7 cervical vertebrae, but 8 spinal nerves ­ cervical nerves exit ABOVE corresponding vertebrae ­ C2 nerve above C2 vertebrae ­ Between C7 and C8  o Empty spot where C8 nerve passes ­ hole ­ created by two vertebrae stacked on each other ­ inferior vertebral notch matched with a superior vertebral notch ­ ­ root coming off anterior side is ventral root ­ dorsal root ganglia – swelling of cell bodies ­ nerves exit spinal cord via ventral root (motor neurons) ­ nerves enter spinal cord via dorsal root (sensory neurons) ­ IN THROUGH THE DOOR, OUT THROUGH THE VENT ­ Spinal nerve: where ventral and dorsal root meet o Mixed spinal nerve split into ventral and dorsal Rami  Rami: branch o Dorsal Rami goes to posterior part of body o Ventral Rami goes to anterior part of body ­ Root ▯ nerve  ▯Rami ­ autonomic nervous system… ­ segmental sensory information ­ dermatome map ­ all spinal levels correspond to specific level of body ­ latent within dorsal root ganglia ­ suppressed ­ when older, virus can become reactivated when immunocompromised ­ infects spinal nerve associated with dorsal root ganglia that it was dormant in ­ infection within sensory neurons ­ infects level of dermatome ­ pain and tingling ­ braid of
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