Cauda equina
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The cauda equina is a bundle of spinal nerves and spinal nerve rootlets, consisting of the second through fifth lumbar nerve pairs, the first through fifth sacral nerve pairs, and the coccygeal nerve,
Human caudal spinal cord anterior view
Arachnoid mater
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The arachnoid mater is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is so named because of its resemblance to a spider web. The arachnoid mater is a der
Image showing arachnoid mater and the underlying subarachnoid space
Image showing parts of the arachnoid mater, including arachnoid granulations.
Brain with arachnoid mater, and an area where it is removed, showing cerebral gyri covered by the translucent pia mater.
Spinal dura mater opened, arachnoid mater visible.