194 



TOPOGRAPHICAL ANATOMY OF THE 



peduncle (the hypo-thalamic tegmental region). The posterior end of 

 the thalamus, corresponding to the pulvinar of the human brain, cannot 

 be precisely determined, because the lateral geniculate body is closely 

 applied to this part. 



In tlie middle line and in a depression bounded by the two thalami 

 and the anterior colliculi of the quadrigeminal bodies, the conical and 

 small but variable pineal^ body (corpus pineale) will be found. 



It should be noted that the pineal body, nucleus habenute, striae 



Longitudinal fissure. 

 Septum pellucidum. ^^^^^W j^^^>^ 0^^ ^^^^^ Corpus callosum. 



Hippocampus.. ^^^^^^^^^gl^^^ ^^^^^ Lateral ventricle. 



imbria. 



White matter. 



Third Ventricle. 



Thalamus. 



Intermediate mass 



Rhinal fissure. 



Optic tract. / • 



Cerebral peduncle. 



Piriform lobe. 

 Recess of infundibulum. 



Hypophysis. 

 Fig. 92. — Transverse section of the brain at the level indicatsd by C in Fig. 89 



(looking forward). 



medullares and the posterior commissure (presently to be examined), 



constitute the epithalainus. 



The geniculate bodies, medial and lateral, are intimately related to 



the thalamus, and are generally referred to as forming the meta- 



thcdartius. The lateral geniculate'^ body (corpus geniculatum laterale) 



is closely applied to the posterior part (pulvinar) ^ of the thalamus, and 



from it the optic tract appears to arise. The more definite and oval 



medial geniculate body (corpus geniculatum mediale) lies between the 



optic tract and the brachium of the posterior coUiculus of the corpora 



quadrigemina. 



^ Pineus [L.], pertaining to the pine (from the resemblance, in shape, of the body 

 to a pine cone.) 



^ Geniculatus [L.], with knee-joints, bent like the knee (genu). 

 ^ Pulvinar [L.], a cushioned coi;ch. 



