. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Side view of villi of the choroid plexus of the lateral ventricle in the brain of a Goose, to show the disposition of the bloodvessels. Not to obscure the mew of t/te bloodvessels, the edge of the epithelium only has been shown. a, epithelium ; b, bloodvessels. (After Valentin.) The epithelium may be best seen by examin- ing the edge of a fold. It becomes very distinct when acted upon by acetic acid. As its particles are very delicate and consist only of a single layer, they are easily detached. The cells of epithelium a
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Side view of villi of the choroid plexus of the lateral ventricle in the brain of a Goose, to show the disposition of the bloodvessels. Not to obscure the mew of t/te bloodvessels, the edge of the epithelium only has been shown. a, epithelium ; b, bloodvessels. (After Valentin.) The epithelium may be best seen by examin- ing the edge of a fold. It becomes very distinct when acted upon by acetic acid. As its particles are very delicate and consist only of a single layer, they are easily detached. The cells of epithelium are most of them six-sided, and contain a clear nucleus, or several minute gra- nules. Valentin states that cilia may be seen playing upon this surface, especially in the embryo. I have observed the peculiar punc- tiform or spiniform formations to which he alludes, which look like the remains of former vibratile cilia. Velum interposition. (Toile Choroidienne, Vicq d'Azyr.)—The choroid plexuses are con- nected to each other by the velum interpositum, which is a triangular fold of pia mater that passes in at the transverse fissure between the upper surface of the tubercula quadrigemina and the posterior reflected portion of the corpus callosum. This process is continuous with the pia mater of the inferior surface of the posterior lobes of the brain, and with that of the superior surface of the cerebellum, and it therefore con- sists of two laminae; as it passes forwards, it sends downwards a little process which em- braces the pineal body ; it forms the roof of the third ventricle, being interposed between that cavity and the fornix, (hence its name,) and at its sides as well as its apex its continuity with the choroid plexuses may be readily de- monstrated. At its anterior extremity it corre- sponds to the foramen commune anterius. The velum interpositum is best exposed in the dis- section from above downwards by removing carefully in succession the corpus callosum and the fo
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