There are 31 pairs of spinal nerves. They consist of 8 pairs of cervical nerves, 12 pairs of thoracic nerves, 5 pairs of lumbar nerves 5 pairs of sacral nerves and 1 coccyxgeal nerve. The spinal cord passes through the vertebral foramen, it comes to an end at the conus medullaris. The filum terminale comes off the end of the conus medullaris and is a anchoring strip of fibrous tissue that attaches the spinal cord to the interior surface of the pelvic girdle. The dura mater of the spinal cord has only 1 layer unlike the dura mater of the brain that has 2 layers, the periosteal and the meningeal. The gray matter, cell bodies of the neurons, in the brain is superficial where in the spinal cord it is deep and its counterpart the white matter, mostly myelinated axons, is superficial in the spinal cord and deep in the brain.
This relates to everyday living by giving us the map of the nerves through the spinal column. Understanding which nerve controls what muscles gives me a better concept of how injuries to certain parts of the spinal cord causes parylsis.
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Betty,
ReplyDeleteJust wanted you to know that I had read all four of your blogs today!...and you are 40 points richer. The only comment I would make is that the application paragraphs that you have been writing could be strengthened by additional information/research that you include from the internet or perhaps resources (pamphlets, textbooks, etc.) that you have at work.
I am looking forward to reading the blogs that you post after winter break!
Dana
I like how you break down and tell us the number of each type of spinal nerves. I thought it was well detailed and explained well. I also enjoyed how you related it to everyday life.
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