Chapter 12 (4)

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Describe Epineurium.
- Outermost covering of nerve.
- Dense network of collagen fibers.
Describe Perineurium.
- Middle layer Fibers extend inward from epineurium.
- Divide nerve into compartments that contain bundles of axons (fascicles).
- Branching blood vessels from epineurium continue on to form capillaries in endoneurium.
Describe Endoneurium.
- Innermost layer.
- Delicate connective tissues surrounding individual axons.
- Capillaries here supply axons, Schwann cells, and fibroblasts.
What is a ramus?

A branch of the spinal nerve.
What do dorsal rami innervte?
- muscles
- joints
- skin of the back
What do ventral rami innervate?

structures of lateral & anterior trunk and limbs
Where are communicating rami located and what do they contain?
- Present in thoracic and superior lumbar segments.
- Contain axons on sympathetic neurons.
What is a dermatome?

It is a specific bilateral region of skin surface monitered by a single pair of spinal nerves.
What is the virus that causes shingles?

varicella-zoster virus
Shingles is viral infection of what?

dorsal root ganglia
What do dorsal rami contain and what do they innervate?
- Somatic and visceral motor fibers.
- Skin and skeletal muscles of back.
What do ventral rami contain and what do they innervate?
- somatic and visceral motor fibers
- ventrolateral body surface, structures of body wall, and limbs.
What are communicating branches of the spinal cord?

Rami communicantes
Describe white rami.
- Preganglionic fibers that are myelinated.
- Visceral motor fibers to sympathetic ganglion.
Describe gray rami.
- Postganglionic fibers that are unmyelinated.
- Innervate glands and smooth muscles of body wall or limbs.
Describe sympathetic nerves.

Preganglionic and postganglionic fibers to structures of thoacic cavities.

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Card Set

Chapter 12 (4)

Description

Lecture test number one.

Updated

2012-01-25T02:23:27Z