. Quain's elements of anatomy . 2>.7l 320 MESEXCEPHALOX. portion of grey matter which is bonnded superficially and deeply bytransverse white fibres derived from the fillet. The superficial fibres are contintious laterally and in front ^itli the fibres cfthe brachium of the inferior qnadrigeminal body, and laterally and behind withthose of the lower fillet. Accoiding- to Meynert the fibres of the lower fillet onone side pass obliquely across the quadrigeminal bodies to emerg-e as the brachiumon the other side ; this continuity, however, if it really exists, is notdirect but occurs
. Quain's elements of anatomy . 2>.7l 320 MESEXCEPHALOX. portion of grey matter which is bonnded superficially and deeply bytransverse white fibres derived from the fillet. The superficial fibres are contintious laterally and in front ^itli the fibres cfthe brachium of the inferior qnadrigeminal body, and laterally and behind withthose of the lower fillet. Accoiding- to Meynert the fibres of the lower fillet onone side pass obliquely across the quadrigeminal bodies to emerg-e as the brachiumon the other side ; this continuity, however, if it really exists, is notdirect but occurs through the naedium of the nerve-cells in the grey matter. Fig. Fig. 288.—Section through the superior part of one of the superior corpora QUADRIGEMINA AND THE ADJACENT PART OF THE OPTIC THALAMUS (after Meyneit). s, aqueduct of Sylvius ; gr, grey matter of the aqiieduct; , quadrigeminaleminence, consisting of : I, stratum lemnisci ; o, stratum opticum; c, stratum cinereum ;Th, thalamus (pulvinar) ; , , intei-nal and external geniculate bodies ; ,hr. i, superior and inferior biachia ; /, fillet; p. I, posterior longitudinal bundle ;r, raphe; III, third nerve; n. Ill, its nucleus; , posterior perforated space ;, substantia nigra ; above this is the tegmentum with its nucleus, the latter beingindicated by the circular area; cr, crusta ; II, optic tract; M, medullary centre ofthe hemisiDhere; , nucleus caudatus; st, stria terminalis. The upper or anterior quadrigeminal bodies are covered, like thelower, with a thin stratum of white fibres {stratum 2onaU). Within thisis a cap-like layer of grey matter {stratum cinerevm,
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
