KIN 2320 Lecture Notes - Lecture 13: Conus Medullaris, Arachnoid Mater, Cauda Equina
1 Oct 2018
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Document Summary
Composed of tough, fibrous and some elastic tissues is the outermost covering membrane of the spinal cord. The spinal arachnoid mater is delicate, avascular membrane composed of fibrous and elastic tissues that lines the dural sac, and the dural root sheaths. It encloses the csf- filled subarachnoid space containing the spina cord, spinal nerve roots and spinal ganglia. The arachnoid mater is not attached to the dura but is pressed against the inner surface of the dura by the pressure of the csf. In a spinal puncture, the needle travels travers the dura and arachnoid mater simultaneously. Lies between the arachnoid mater and the pia mater and is filled with the fluid. The enlargement of the space in the dural sac, caudal to the conus medullaris and containing csf and the cauda equina is the lumbar cistern. Pia mater - deepest layer covers the spinal cord itself.
