| alma mater | A college or seminary where one is educated. Origin: L, fostering mother. Source: Websters Dictionary (01 Mar 1998) |
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| arachnoidea mater spinalis | That portion of the arachnoid which lies within the vertebral canal and surrounds the spinal cord and the vertebral portion of the subarachnoid space. It extends from the foramen magnum above to the S-2 vertebral level. Since the spinal cord ends at the L-2 vertebral level, a wide separation occurs between the arachnoid and pia mater, the lumbar cistern, filled with cerebrospinal fluid in which the cauda equina is suspended. Synonym: arachnoidea mater spinalis, spinal part of arachnoid. (05 Mar 2000) |
| arachnoid mater | Like a cobweb, covered with or consisting of soft fibres or hairs so entangled as to give a cobwebby appearance. (09 Oct 1997) |
| arachnoid mater cranialis | That portion of the arachnoid which lies within the cranial cavity and surrounds the brain and the cranial portion of the subarachnoid space. In several sites it is relatively widely-separated from the pia mater, creating the cranial subarachnoid cisterns. Synonym: arachnoid mater cranialis, arachnoid mater encephali, cerebral part of arachnoid. (05 Mar 2000) |
| arachnoid mater encephali | An alternate term for arachnoid of brain. (05 Mar 2000) |
| mater | The "sheltering" coverings of the central nervous system. Origin: L. Mother (05 Mar 2000) |
| pia mater | <anatomy> The delicate and highly vascular membrane immediately investing the brain and spinal cord. Origin: NL, fr. L. Pia (fem. Of pius tender, kind) + mater mother. Source: Websters Dictionary (01 Mar 1998) |