Spinal Nerves – Anatomy of the Nervous System (Nursing)

by Jasmine Clark

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    00:00 So now that we've discussed the different spinal cord segments, let's talk about the spinal nerves.

    00:07 The spinal nerves are what connects the central nervous system to the sensory receptors, muscles and glands of the body.

    00:16 The spinal nerves are considered a part of the peripheral nervous system.

    00:22 There are 31 pairs of spinal nerves.

    00:25 And the anterior and posterior roots attach a spinal nerve to a segment of the spinal cord.

    00:33 If we take a closer look at the individual parts of the spinal nerves, you will find that there are 8 pairs of cervical nerves, 12 pairs of thoracic nerves, 5 pairs of lumbar nerves, 5 pairs of sacral nerves and one pair of coccygeal nerves.

    00:56 Recall these different names correspond to the vertebrae where the spinal nerves will exit from intervertebral foramina.

    01:07 So if we take a closer look at the anatomy of the spinal nerves, starting with the connective tissue layers that cover them, you will find that there are three main connective tissue layers.

    01:20 First, you have the epineurium which is going to surround the entire nerve.

    01:27 Inside, we have bundles of axons referred to as fascicles.

    01:34 The connective tissue layer covering the fascicles is referred to as the perineurium.

    01:41 And then finally, each individual axon contains a connective tissue covering called the endoneurium.

    01:49 And together, this transverse section shows the coverings of the spinal nerve.

    01:56 So along with the spinal nerves as they exit from the intervertebral foramen, the spinal nerve is going to divide into several brances known as rami.

    02:08 There's the dorsal rami which is going to serve the dorsal portion of the trunk and goes toward the posterior portion of the body.

    02:19 Then you have the ventral ramus which is going to serve the ventral portion or anterior portion of the trunk, and the upper and lower limbs.

    02:30 You also have meningeal branches.

    02:33 These branches from the spinal nerves go from the spinal nerve and then re-enter back to the spinal cord through the intervertebral foramen.

    02:44 These supply the vertebrae, the vertebral ligaments, blood vessels at the spinal cord and the meninges.

    02:54 And then finally, for the autonomic nervous system, we have the rami communicantes.

    03:00 These are going to contain our autonomic nerves.

    About the Lecture

    The lecture Spinal Nerves – Anatomy of the Nervous System (Nursing) by Jasmine Clark is from the course Spinal Cord and Spinal Nerves – Physiology (Nursing).

    Included Quiz Questions

    1. Spinal nerves
    2. Anterior roots
    3. Posterior roots
    4. Basal ganglion
    1. 31 pairs
    2. 33 pairs
    3. 35 pairs
    4. 29 pairs

    Author of lecture Spinal Nerves – Anatomy of the Nervous System (Nursing)

     Jasmine Clark

    Jasmine Clark

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