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13 Spinal arachnoid. Arachnoidea mater spinalis. Thin avascular membrane attached to the dura mater by surface adhesion and to the pia mater by its connective tissue fibers. A

14 Subarachnoid space. Spatium sub-arachnoideum. Space between the flat part of the arachnoid and the pia mater. It is filled with arachnoidal connective tissue fibers and cere-brospinal fluid. A

15 Cerebrospinal fluid. Liquor cerebrospinal. Fluid secreted predominantly by the choroid plexus. It is protein-poor and has a cell content of 2-6 per mm.

1 Cranial arachnoid. Arachnoidea mater cranialis (encephali). Thin, avascular membrane attaching to the cranial dura only by surface adhesion and communicating with the pia mater by connective tissue fibers. D

2 Subarachnoid space. Spatium sub-arachnoideum. Space between flat portion of arachnoid and pia mater. It is filled with arachnoidal connective tissue fibers and cere-brospinal fluid. D

3 Cerebrospinal fluid. Liquor cerebrospinalis. Protein-poor fluid secreted by the choroid plexus with a cell content of 2-6 per mm. It flows into the subarachnoid space through openings in the fourth ventricle.

4 Subarachnoid cisterns. Cisternae sub-arachnoideae. Expansions of the subarachnoid space containing cerebrospinal fluid.

5 Cerebellomedullary cistern (cisterna magna).

Cisterna cerebellomedullaris (magna). Space between the cerebellum and medulla oblon-gata filled with cerebrospinal fluid. It communicates with the fourth ventricle by a median aperture. It is accessible through the foramen magnum. B

6 Cisterna of lateral fossa of cerebrum. Cisterna fossae lateralis cerebri. Space between the insula, temporal, frontal and parietal lobes. It is filled with cerebrospinal fluid and is accessible through the lateral sulcus. It contains branches of the middle cerebral and insular arteries. C

7 Chiasmatic cistern. Cisterna chiasmatica. Enlarged space around the optic chiasma filled with cerebrospinal fluid. B

8 Interpeduncular cistern. Cisterna inter-peduncularis. Space situated behind the chias-matic cistern and bordered laterally by the temporal lobe and the cerebral crura. It is filled with cerebrospinal fluid and contains the oculomotor nerve, branches of the basilar artery, the origin of the superior cerebellar artery and the posterior cerebral artery. B

9 Ambient cistern. Cisterna ambiens. Enlarged cerebrospinal fluid-filled space lateral to the cerebral crus. It contains the posterior cerebral artery, superior cerebellar artery, basal vein (Rosenthal's) and the trochlear nerve. F

10 Cisterna pericallosa. Space filled with cere-brospinal fluid along the corpus callosum. F

11 Pontocerebellar cistern. Cisterna pontocere-bellaris. Expanded space in the cerebellopon-tine angle filled with cerebrospinal fluid. It communicates with the 4th ventricle by a lateral aperture. E

12 Arachnoid granulations. Granulationes arachnoideae. Avascular, villous-like outpock-etings of the subarachnoid space into the sagittal sinus and diploic veins. They are more pronounced after the tenth year of life and are concerned in the excretion of cerebrospinal fluid. D

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