. Anatomy, descriptive and applied. Anatomy. 942 THE NERVE SYSTE3I the plexus of the middle cornu; and the posterior choroid artery from the posterior cerebral artery reaching the choroid plexus in the neighborhood of the splenium. The venules of the plexus join to form a tortuous middle cornual vein which terminates frontad by joining one of the velar veins. The velar veins (veins of Galen), one on either side close to the median line, running in the fold of the velum interpositum, are formed by the union of the tenial, striatal, and middle cornual veins. The two velar veins unite to form a c
. Anatomy, descriptive and applied. Anatomy. 942 THE NERVE SYSTE3I the plexus of the middle cornu; and the posterior choroid artery from the posterior cerebral artery reaching the choroid plexus in the neighborhood of the splenium. The venules of the plexus join to form a tortuous middle cornual vein which terminates frontad by joining one of the velar veins. The velar veins (veins of Galen), one on either side close to the median line, running in the fold of the velum interpositum, are formed by the union of the tenial, striatal, and middle cornual veins. The two velar veins unite to form a common trunk which empties into the straight sinus. The Hippocampus and Fornix.—The hippocampus and the fornix merit special description. The hippocampus, as seen in the middle cornu, is a white eminence about 5 cm. (2 inches) in length, of a curved elongated form, enlarging cephalad and tapering caudad as the hippocampal fissure decreases in depth. The enlarged extremity is marked by alternate elevations and depressions, usually three in number, the hippocampal digitations; because of its resemblance to a lion's paw it is sometimes called the pes leonis or pes hippocampi. The white appearance of the ventricular aspect of the hippocampus is due to a stratum of white substance, the alveus, made up of myelinic axones from hippocampal cells and continued into the fimbria. The fimbria is folded so that its sharp margin is directed Choroid plexus Bulb of posterior cornu Ccdcar. Fissure o/, Sylvius Fig. 703.—Posterior and descending Eminentia collateralis Fimbria Hippocatnpus of left lateral ventricle exposed from the aide. toward the cavity of the middle cornu; eventually its fibres will be seen to enter into the formation of the fornix. The formation of the hippocampus is best ob- served in a coronal section (Fig. 686). In this view it is seen to be a peculiarly folded margin of the cerebral cortex, corrugated by the intrusion of the hippo- campal and fimbriodentate fissures. Mo
Size: 1907px × 1310px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
