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).

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

     Jasmine Clark

    Jasmine Clark

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