Corpus Quadrigeminum

Section through anterior corpus quadrigeminum and part of optic thalamus. Labels: s, aqueduct of Sylvius; gr. gray matter of aqueduct; c.q.s., quadrigeminal eminence; l., stratum lemnisci; o, stratum opticum; c., stratum cinereum; Th., pulvinate of optic thalamus; c.q.e., c.g.i., lateral and median corpora geniculata; br.s., br.i., superior and inferior brachia; f., fillet; p.l., posterior longitudinal bundle; r., raphe; III., third nerve, and n.III., its nucleus; l.p.p., posterior perforated space; s.n., substantia nigra, above this is the tegmentum with the circular area of the red nucleus; cr., crusta; II., optic tract; M., medullary center of hemisphere; n.c., nucleus caudatus; st., stria terminalis.

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