. Cunningham's Text-book of anatomy. Anatomy. 584 THE NEKVOUS SYSTEM. nerve. It is termed, therefore, the sulcus n. oculomotorii. The lateral groove, which is placed on the lateral aspect of the mesencephalon, receives the name of the sulcus lateralis [mesencephali]. When traced downwards, it is observed to become continuous with the furrow which intervenes between the brachium pontis and brachium conjunctivum of the cerebellum. A close inspection of the lateral surface of the tegmental part of the pedunculi cerebri, below the level of the brachia, will reveal some faintly-marked bundles of fi
. Cunningham's Text-book of anatomy. Anatomy. 584 THE NEKVOUS SYSTEM. nerve. It is termed, therefore, the sulcus n. oculomotorii. The lateral groove, which is placed on the lateral aspect of the mesencephalon, receives the name of the sulcus lateralis [mesencephali]. When traced downwards, it is observed to become continuous with the furrow which intervenes between the brachium pontis and brachium conjunctivum of the cerebellum. A close inspection of the lateral surface of the tegmental part of the pedunculi cerebri, below the level of the brachia, will reveal some faintly-marked bundles of fibres curving obliquely upwards and backwards to reach the inferior colliculus (Fig. 517, p. 583). These are fibres of the lateral lemniscus, coming to the surface at the sulcus lateralis and sweeping over the subjacent brachium conjunctivum to gain the inferior colliculus, inferior brachium, and medial geniculate body. INTERNAL STRUCTURE OF THE MESENCEPHALON. When transverse sections are made through the mesencephalon the aquseductus cerebri is seen to be surrounded by a thick layer of gray matter, which receives the name of the stratum griseum centrale or the central gray matter of the aqueduct. On the dorsal aspect of this gray matter the corpora quadrigemina form a layer which it from the surface, and STRATUM GRISEUM CENTRALE AQU/EDUCTUS CEREBRI MEDIAL LONGITUDINAL BUNDLE SULCUS LATERALfS. OCULOMOTORII to which the term lamina quadri- gemina is applied. On the anterior and lateral aspects of the central gray matter are the tegmental por- tions of the cerebral peduncles; whilst, intervening between each of the tegmenta and the corresponding basis pedunculi, there is a conspicu- ous mass of dark pigmented matter, termed the substantia nigra. Aquseductus Cerebri and Stratum Griseum Centrale.—The Fig. 518.—Diagrammatic View of the Cut Surface of aqueduct is the canal which leads ^";00™ IeE SD™ PAM ^m the fourth ventriole below, up- wards through the mese
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