PenEDGE
紀錄生活Worldwide 藝術 運動 語言 醫學 多彩多姿, 沒有框架的人生
2012年4月15日 星期日
The spinal cord
1) It’s cylindrical shape
2) Starts : At the foramen magnum in the skull
3) Ends
1. Adult : Lower border of the 1st lumbar vertebra (L 1)
2. Young child : upper border of the 3rd lumbar vertebra (L 3)
4) Inferiorly
1. Tapers off into the conus medullaris (It’s a prolongation of the pia mater)
2. Filum terminale descends & attach to the posterior surface of the coccyx
5) Anteriorly : Anterior median fissure (Deep longitudinal fissure)
6) Posteriorly : Posterior median sulcus
7) Coverings
1. 3 meninges (Dura, Arachnoid & Pia mater)
2. CSF in the sub arachnoid space
8.) It has 2 fusiform enlargements
1. Cervical enlargement : Gives origin to brachial plexus
2. Lumbar enlargement : Gives rise to lumbosacral plexus
9) There are 31 pairs of spinal nerves attached by the:
1. Motor roots (Anterior)
2. Sensory roots (Posterior)
10) Each posterior nerve root has a posterior root ganglion (Gives rise to peripheral & central nerve fibers)
2012年3月28日 星期三
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