VAN 121: Veterinary Gross Anatomy-II (2+2)

BRAIN STEM 

Examine the ventral face of the brain and study the following structures 

 

• At the anterior extremity of each hemisphere is the olfactory bulb continous behind with the olfactory tract and the two diverging olfactory striae.
• Between the striae is the trigonum olfactorium behind which is the fossa lateralis. Behind the fossa is the piriform lobe.
• On the median line, the brain stem is continous behind with the spinal cord and in front it consists of the following from behind forwards.
• The medulla oblongata, the pons and the cerebral peduncles.
• The cerebral peduncles diverge in front to enclose the interpenduncular fossa and disappear into the corresponding cerebral hemispheres.
• The fossa presents the tuber cinerium, a grey eminence to which the infundibulum of the pituitaty gland is attached and behind this is the mamillary body.
• The anterior end of each cerebral peduncle is crossed by a band of white matter the optic tract that forms with its fellow the optic chiasma.
• Examine the brain from the dorsal aspect and study the fissures and convolutions of the cerebrum.