Fig- 54- SUPERIOR SURFACE OF MEDULLA (cerebellum removed), CORPORA QUADRI- 

 GEMINA, AND OPTIC THALAMi (cerebrum removed). a, Optic thalamus. b, Pulvinar. 

 c, External geniculate body, d, Internal geniculate body. <?, External lateral groove. 

 /, Third ventricle, g, Peduncle of pineal gland, h, Nates. z, Testes. Between them 

 the crucial ridge. j, Frenulum veli, and the sectioned valve of Vieussens. k, Superior 

 cerebellar peduncle. /, Middle cerebellar peduncle, m, Inferior cerebellar peduncle. 

 n, Striae acusticae. o, Posterior median fissure, leading anteriorly under the corpora 

 (juadrigemina into the aqueduct of Sylvius, and posteriorly by ( t ) the calamus scriptorius, 

 into the central canal of the spinal cord, p, Fovea anterior or superior, n. Fasciculus 

 teres. r, Fovea posterior or inferior, s, Calamus scriptorius. t, Posterior medi-ui fis- 

 sure of cord , Clava. v, Funiculus gracilis. w, Funiculus cuneatus. x, Sulcus 

 posterolateral. y, Restiform body. 



