. Anatomy, descriptive and applied. Anatomy. 968 THE NERVE SYSTE3I On either side of the superior longitudinal sinus, especially near its middle, and also near the lateral and straight sinuses, are numerous spaces in the dura which communicate with the sinus, either by a small opening or a distinct venous channel. These spaces are the parasinoidal sin- uses (lacunae laterales). Many of the meningeal veins do not open directly into the sinuses, but tlu-ough the parasinoidal sinuses. These venous lacunae are often invaginated by arachnoid villi, and they communicate with the underlyi
. Anatomy, descriptive and applied. Anatomy. 968 THE NERVE SYSTE3I On either side of the superior longitudinal sinus, especially near its middle, and also near the lateral and straight sinuses, are numerous spaces in the dura which communicate with the sinus, either by a small opening or a distinct venous channel. These spaces are the parasinoidal sin- uses (lacunae laterales). Many of the meningeal veins do not open directly into the sinuses, but tlu-ough the parasinoidal sinuses. These venous lacunae are often invaginated by arachnoid villi, and they communicate with the underlying cerebral veins, and also with the diploic and emissary veins. The nerves of the dura are filaments from the trochlear, the ophthalmic division of the tri- geminal, the semilunar or Gasserian ganghon, the vagus, the hypoglossal, and the sjonpa- thetic. The Arachnoid (Arachnoidea Encephali) (Fig. 728). The cranial arachnoid is a delicate membrane which envelops the brain, lying between the pia internally and the dura externally; from this latter membrane it is separated by a very fine slit or space, the subdural space (cavum subdurale). The subdural space contains a very minute quantity of fluid of the nature of lymph. OLFACTORY. ARACHNOID FlQ. 728.—The arachnoid upon the base of the brain. On the right the arachnoid has been partly removed to show the cerebrum and cerebellum with their superficial veins. (Poirier and Charpy.) The arachnoid is prolonged upon emerging nerves and joins the lymph spaces of the nerves. The subdural space does not communicate with the subarachnoid space. The arachnoid invests the brain loosely, being separated from direct contact with the cerebral substance by the pia, and a quantity of loose areolar tissue, the subarachnoidean areolar tissue. On the upper surface of the cerebrum the arachnoid. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
