THE BRAIN. 



29 



rior communicating artery it gives off the posterolateral perforating (ganglionicj 

 arteries, which supply the posterior portion of the optic thalamus, crus cerebri, and 



Velum interpositum 

 Middle commissure 

 Choroid plexus 

 Foramen of Monro 



Septum lucidum / / / / 



/ //// Posterior commissure 



Pineal body 



Splenium 



Corpora quadri- 

 gemina 



Anterior commissure 



Optic nerve 



Optic chiasm 



Pituitary body 



Mammillary body 



Aqueduct of Sylvius 



4th ventricle 

 FIG. 35. -Medial section of the brain. 



corpora quadrigemina. The branches to the cortex supply a small portion of the 

 inferior surface of the temporosphenoidal lobe and the occipital lobe as seen in 

 Figs. 31 and 32. 



Corpus callosum 



Septum lucidum 

 Caudate nucleus 



Choroid plexus 

 Velum interpositum 

 Veins of Galen 



FIG. 36. Horizontal section of brain ; the corpus callosum and fornix have been removed, exposing the lateral 

 ventricles, with the caudate nuclei projecting into them anteriorly and the velum interpositum farther back, with 

 the choroid plexus at the sides and the veins of Galen nearer the middle line. The lateral ventricles in this brain 

 are somewhat larger than usual. 



