A manual of anatomy . n exhibits the corpora quadrigemina,or coUiculi; of these there axe four, two superior and two inferior, andthey are separated from one another by a transverse and a longi-tudinal furrow. The latter is in the midline. The superior quadrigemina are oval in shape, yellowish gray incolor and are the larger. Above, in the median groove that sepa-rates them, lies the pineal body. They are centers connected witheye-muscle reflexes, resulting from optic and auditory impulses. The inferior quadrigemina are nearly hemispherical in shape andlighter in color than the preceding. They
A manual of anatomy . n exhibits the corpora quadrigemina,or coUiculi; of these there axe four, two superior and two inferior, andthey are separated from one another by a transverse and a longi-tudinal furrow. The latter is in the midline. The superior quadrigemina are oval in shape, yellowish gray incolor and are the larger. Above, in the median groove that sepa-rates them, lies the pineal body. They are centers connected witheye-muscle reflexes, resulting from optic and auditory impulses. The inferior quadrigemina are nearly hemispherical in shape andlighter in color than the preceding. They are nuclei in the pathwayof auditory impulses. THE CEREBELLUM 381 The superior and inferior quadrigemina rest upon the lammaquadrigefnina which really constitutes the dorsal wall of the mid-brain. The iter, or aqueduct {aqtieducHis cerebri), is a narrow canal con-necting the third and fourth ventricles. Its shape varies somewhatin different parts and it has nearer the dorsal than the ventral sur-face of the Lenticular nucleus Caudate nucleusInternal capsule Thalamus Corpora quadrifiemins Valvula Brachium pontis Dentate nucleus Fourth ventricle Di ~ Oblongata orsal groove ^ Fig. 27 r.—Dissection showing the dorsal aspect of the brain stem with the copora striataand dentate nuclei intact. (From a photograph.) THE CEREBELLUM The cerebellum lies in the posterior fossa of the skull under coverof the occipital pole of the cerebrum from which it is separated bythe shelf of dura called the tentorium cerebelli. It averages 165grams in the male and 155 grams in the female, reaching its greatestweight between the twenty-fifth and thirty-fifth years. It repre-sents a coordinating center and might well be called the balancingbrain. The cerebellum consists of two lateral lobes, or hemispheres, anda middle lobe, or vermis. The two hemispheres are separated fromeach other ventrally by a groove, the vallecula, into which the oblon-gata, tegmental portion of the pons and the midbra
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
