Archive image from page 577 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 544 THE NERVOUS SYSTEM. Anterior medullary. velum Brachiura eon- junetivum Braehium pontis Stria? medullares Area acustica Ala cinerea (trigonum vagi) Funiculus cuneatus Funiculus gracilis Taenia thalami Pineal body Superior quadri- geminal body Inferior quadri- erainal body Pedunculus cerebri Pontine part of floor of 4th ventricle Colliculus facialis Fovea superior Restiform body Trigonum n. hypoglossi Clava Tuberculum cinereum Funiculus cuneatus i
Archive image from page 577 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 544 THE NERVOUS SYSTEM. Anterior medullary. velum Brachiura eon- junetivum Braehium pontis Stria? medullares Area acustica Ala cinerea (trigonum vagi) Funiculus cuneatus Funiculus gracilis Taenia thalami Pineal body Superior quadri- geminal body Inferior quadri- erainal body Pedunculus cerebri Pontine part of floor of 4th ventricle Colliculus facialis Fovea superior Restiform body Trigonum n. hypoglossi Clava Tuberculum cinereum Funiculus cuneatus is carried upwards to the lower border of the pons, but is often rendered very shallow by numerous external arcuate fibres which emerge upon the surface between its lips and then curve laterally to reach the posterior part of the medulla oblon- gata. At the lower margin of the pons it expands slightly and ends in a blind pit, which receives the name of the foramen caecum of Vicq d'Azyr. The fissura mediana posterior is present only on the lower half of the medulla oblongata. As it ascends it rapidly becomes shallower. Half-way up, the central canal opens on the dor- sal surface of the medulla oblongata, and at this point the lips of the posterior median fissure are thrust apart from Fig. 479.—Posterior View of the Medulla, Pons, and Mesencephalon each other and consti- OF A FULL-TIME HUMAN FffiTUS. tute the boundaries of a triangular field, which is thus opened up on the dorsal surface. This triangular field is the lower part of the fossa rhomboidea, or the floor of the fourth ventricle of the brain. The lower half of the medulla oblongata, containing as it does the continuation of the central canal of the spinal medulla, is frequently termed the closed part of the medulla oblongata; the upper half, above the opening of the canal, which by its dorsal surface forms the lower part of the floor of the fourth ventricle, is then called the open part. Deferring for the present the e
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