BIO 121 Lecture Notes - Lecture 20: Arachnoid Mater, Pia Mater, Filum Terminale
14 Nov 2016
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Meninges: define 3 specialized membranes and associated spaces that surround the spinal cord (include general histology and function of each). Label figure 14. 2c: dura mater: tough, fibrous, outermost layer. Stabilizes the spinal cord within the vertebral canal. Cranial and sacral attachments stabilize the longitudinal axis of the spinal cord: arachnoid mater: middle layer. Separated from the pia mater by the subarachnoid space. Arachnoid trabeculae extend from the arachnoid to the outer layer of the pia mater: pia mater: innermost layer. Flow through a network of collagen and elastin fibers produced by modified fibrokists. Figure 14. 4b: gray matter: central canal, consists of somas (cell bodies) surrounding the central canal, consists of glial cells, white matter: consists of axons, axons are organized into tracts of columns (in. White matter: gray matter: somas are organized into groups called nuclei: sensory nuclei and motor nuclei.
