Dorsal view of the sheep's brain
Lateral view of the sheep's brain
Ventral view of the sheep's brain
Midsagittal view of the sheep's brain
Dorsiflexed view of the sheep's brain
Since the human and the sheep are both mammals their brains are similar, but not exactly the same. We can study sheep brains to get an idea about the general organization of the human brain.
Take a good look at the dorsal external brain (including the lateral view). You can probably still see some of the dura_mater covering the outer surface of the dorsal brain. Observe the major structures: the cerebrum , cerebellum , and spinal_cord .
The visible structures on the ventral surface of the brain include the olfactory_bulbs , two regions of the brain_stem (the medulla and the pons ), the cerebral_peduncles (which are associated with the third brain stem region known as the midbrain ; the cerebral peduncles are fiber tracts that connect the cerebrum and the medulla, the mammillary_body (humans have two - they help with sense of smell) and optic_nerves . The cross-over point of the optic nerves is called the optic_chiasma .
The sagittal sheep brain section allows a review of the internal organization of the brain. Identify the
mammillary_body , and
Notice the physical appearance of the cut cerebellum. This pattern is referred to as the arbor_vitae (tree of life).
The dorsiflexed sheep brain reveals the pineal_body (also called the pineal gland), cerebellum , cerebrum , and the corpora_quadrigemina.
Note: The corpora quadrigemina consist of two superior_colliculi (visual reflex centers) and two inferior_colliculi (auditory reflex centers).