. Cunningham's Text-book of anatomy. Anatomy. 636 THE NEKVOUS SYSTEM. centre of which it takes a curved course forwards and medially to a point about an inch behind the extremity of the temporal pole. In the angle between the diverging posterior and descending horns the cavity of the ventricle presents an expansion of a somewhat triangular shape. To this the name of trigonum collaterale is sometimes given. The roof of the inferior horn is formed for the most part by the tapetum of the corpus callosum. At the extremity of the horn the roof presents a bulging into the cavity. This is produced by
. Cunningham's Text-book of anatomy. Anatomy. 636 THE NEKVOUS SYSTEM. centre of which it takes a curved course forwards and medially to a point about an inch behind the extremity of the temporal pole. In the angle between the diverging posterior and descending horns the cavity of the ventricle presents an expansion of a somewhat triangular shape. To this the name of trigonum collaterale is sometimes given. The roof of the inferior horn is formed for the most part by the tapetum of the corpus callosum. At the extremity of the horn the roof presents a bulging into the cavity. This is produced by a collection of gray matter termed the amygdaloid nucleus. The stria terminalis and the attenuated tail of the caudate nucleus are both prolonged into the inferior horn and are carried forwards, in its roof, to the amygdaloid nucleus. On the floor of the inferior horn the following structures are seen: (1) hippocampus: (2) the chorioid plexus; (3) the fimbria; and (4) the eminentia collateralis. The hippocampus is for the most part covered by the chorioid plexus of the lateral ventricle. If this is detached a fissure appears between the fimbria and the roof of the ventricular horn. This is the chorioid fissure. It appears at a very Splenium of corpus callosum Bulb of the posterior cornu _ Bulb of the posterior cornu. Fibres of corpus callosum (tape- (tum '. Optic radiations Inferior occipito-froutal fasciculus. Fig. 565.—Frontal Section through the Posterior Horns of the Lateral Ventricles, viewed from the front. early date in the development of the cerebral hemisphere, and takes an arcuate course round the posterior end of the thalamus. In the region of the pars centralis of the lateral ventricle it extends as far forwards as the foramen inter - ventriculare and is formed by the involution of an epithelial part of the wall of the ventricle over the chorioid plexus (p. 622). In the region of the inferior horn, when the chorioid plexus with the involuted epithelial layer whic
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