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A&P Ch 9 Spinal Cord
Terms in this set (15)
The spinal cord goes from the
brain down through the vertebrae and ends with the upper lumbar region. It does not go into the sacral region as it stops growing before the vertebrae are finished growing (it ends at L1)
the end of the spinal cord at the lower region is made up of a lot of
nerves that branch out and appear like a horse's tail. This collection of nerves is thusly called the cauda equina
The tip of the actual spinal cord before the cauda equina is called the
In order to stabilize the end of the spinal cord so it isn't just floating freely, it is attached to the
coccyx by a thin piece of fibrous tissue called the filum terminalis
The spinal cord is visible to the eye and is about the diameter of
The majority of sensory functions are in the posterior regions of the spinal cord and motor functions are in the
anterior regions of the spinal cord
The spinal cord is surrounded by coverings called
There are three meninges:
the dura mater, the arachnoid mater and the pia mater.
The dura mater
this stands for 'tough mother' and is the thick outer covering of the spinal cord. Outside of the dura, by the vertebrae, is the epidural space which is the site where a person would receive an epidural injection. This space is not in the meninges or the spinal cord at all. Beneath the dura mater is a space called the subdural space. This space is a potential space that could occur between the dura mater and the arachnoid mater. It only occurs when there is some type of injury and there is leakage into this area. A common problem from trauma is what is called a subdural hematoma. This is where an injury has occurred and there is bleeding in this space.
The arachnoid mater
this is the middle layer of the meninges. It resembles a bunch of cobwebs and is a very thin delicate layer. The space beneath the arachnoid mater is the subarachnoid space which contains cerebrospinal fluid and blood vessels. This is the area where cerebrospinal fluid is taken during a spinal (or lumbar) puncture.
The pia mater
this is the tightly bound extremely thin inner layer that is in direct contact with the spinal cord.
The spinal nerves run out to the periphery from the spinal cord through holes in the vertebrae called
intervertebral foramen. There are 31 pairs of spinal nerves
In cross-section, the spinal cord contains both
white matter and gray matter.The white matter contains the myelinated axons and glial cells; it does not contain cell bodies.
The white matter consists of
myelinated axons in tracts that run up and down the spinal cord. These carry sensory and motor information to and from the higher-level processing centers of the brain. So sensory runs up the posterior part of the spinal cord and motor runs down the anterior part. Much of the motor and sensory control of the right side of your body is processed by the left side of the brain, and most of the left side of your body is processed by the right side of the brain. When a spinal tract crosses over to the other side, it is called decussation.
The gray matter contains
neuron cell bodies, unmyelinated axons, dendrites near the cell bodies along with glial cells. The cell bodies in the gray matter coordinate the transfer of information from sensory to the white matter for processing and back to motor. They also send information to the tracts in the white matter that needs to go to the brain to be processed.
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THIS SET IS OFTEN IN FOLDERS WITH...
A&P Concept Coach Ch 7 Part 1
A&P Ch 9 Spinal Cord
A&P Concept Coach Ch 7 Part 2
A&P Ch 10 The Brain