. Cunningham's Text-book of anatomy. Anatomy. 624 THE NEKVOUS SYSTEM. attached end of the peduncle is called the trigonum olfactorium. Immediately behind the trigone a small obliquely placed ovoid area of gray matter, the tuberculum olfactorium, can sometimes be detected in the human brain; but in the brains of most mammals with a greater development of the organs of smell this swollen area is much more prominent and constant. In most human brains, however, it is difficult to distinguish it from a much more extensive area, which ex- tends behind and to its lateral side, the substantia perforat
. Cunningham's Text-book of anatomy. Anatomy. 624 THE NEKVOUS SYSTEM. attached end of the peduncle is called the trigonum olfactorium. Immediately behind the trigone a small obliquely placed ovoid area of gray matter, the tuberculum olfactorium, can sometimes be detected in the human brain; but in the brains of most mammals with a greater development of the organs of smell this swollen area is much more prominent and constant. In most human brains, however, it is difficult to distinguish it from a much more extensive area, which ex- tends behind and to its lateral side, the substantia perforata anterior (Fig. 552). Along the anterior margin of this perforated substance there can sometimes be detected a small, rounded, rope-like strand of gray matter, the medial end of which passes into the trigonum olfactorium. This is the anterior part of the area piri- Tuberculum olfactorium Olfactory tract I Optic tract Substantia perforata anterior Stria olfactoria lateralis upon anterior part of piriform area Nucleus amygdala; (cut surface) j Piriform area (cut surface) J Limen insula Optic nerve Optic chiasma Infundibulum / Corpus mamillare / / Substantia perforata posterior j j I Oculomotor nerve I ! •' •' Internal capsule. Optic radiation / Stria terminalis I j i I Caudate nucleus ; / ; Lateral geniculate body Brachium colliculi superioris I Tlialamus (posterior tubercle) Medial geniculate body Basis peduncul ,' Optic radiation Caudate nucleus Stria terminalis Radiatio thalamo-temporalis (acoustic radiation) passing from the medial geniculate body into the anterior transverse temporal gyrus Red nucleus Substantia nigra Fig. 552.—Pakt of the Ventral Surface of the Prosencephalon, showing the Attach- ment of the Olfactory Tract. Olfactory area, dull yellow ; optic, blue ; motor fibres, red ; acoustic fibres, bright yellow. formis—the stalk of the pear-shaped lobe—and upon its surface is placed a very well-defined narrow band of nerve-fibres, the stria olfactoria late
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