DISSECTION OF THE HEAD AND NECK 



345 



large vein of the cerebrum (vena magna cerebri 

 [Galeni]), which in turn opens into the straight 

 sinus (sinus rectus). 



(d) Chorioid plexus of lateral ventricle (plexus chorioideus ventriculi lat- 

 eralis ) . 



Pul 



Po 



Isthmus rhombencephali seen in profile. 



BIT, tractus opticus ; BrQa, brachiura quadrigeminum superius ; BrQp, brachium quadrigeminum 

 inferius ; Cge, corpus geniculatum laterale ; Cgi, corpus geniculatum mediale ; Chll, chlasma opticum ; 

 Crst, corpus restiforme ; Fla, funiculus lateralis of medulla oblongata ; Jaa, fibrae arcuatae externae ; 

 Fob, fibrae superficiales pontis ; Cp, corpus pineale ; Nil, N. opticus ; Oi, oliva ; P, pedunculus cerebri ; 

 Pern, brachium pontis; PCS, brachium conjunctivum; Po, pons Varoli ; Pul, pulvinar; Py, pyramis; 

 Qa, colliculus superior; Qp, colliculus inferior; SI, trigonum lemnisci; Rm, lemniscus medialis; si, 

 sulcus lateralis; Th, thalamus; Tpo, taenia pontis; Tpt, tractus peduncularis transversus. (After J. 

 D6jerine, Anatomic des centres nerveux, t. i., Paris, 1895, p. 328, Fig. 192.) 



(da) Chorioid skein (glomus chorioideum) . 



Now cut through the V. terminalis at its junction with 

 the V. cerebri interna, seize the apex of the right half of 

 the tela chorioidea ventriculi tertii, and pull it with the 

 chorioid plexuses backward, but be careful not to tear away 

 the corpus pineale beneath it behind. Examine 



(e) Chorioid plexus of third ventricle (plexus chorioideus ventriculi 

 tertii) . 



