Anatomy and Cell Biology 3319 Lecture Notes - Lecture 3: Axillary Nerve, Musculocutaneous Nerve, Ulnar Nerve
23 Jun 2016
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Document Summary
Cranial and spinal nerves are both part of the pns. Intervertebral foramen is created by having 2 vertebrae stacked on top of each other and they have 2 processes that interact w e/o to create this opening. In thoracic, lumbar, and sacral, the nerves exit below the vertebrae. All rootlets that merge into one root are connected to one segment. Dorsal and ventral root merge to form spinal nerve, which then splits to form the dorsal and ventral rami. Sensory info comes in, and goes exclusively to the dorsal root. Ventral rami are bigger because they supply both limbs and trunk. Dorsal rami are responsible for much smaller section of the body: deep back muscles and skin that overlays those muscles. Due to the segmental spinal nerves that we have, we end up with this segmental pattern of sensory innervation. This is a dermatome map; each little section has a #: spinal nerve it"s associated with.
