Changes

The substantia nigra is a prominent area of the mid brain and is identifiable on cross sections by its darker pigmentation. This pigmentation is due to the gradual accumulation of pigmentation of neurons and is associated with basal nuclei within the tissue. The '''substantia nigra''' nuclei are involved in the '''control of voluntary movement'''.

The substantia nigra is a prominent area of the mid brain and is identifiable on cross sections by its darker pigmentation. This pigmentation is due to the gradual accumulation of pigmentation of neurons and is associated with basal nuclei within the tissue. The '''substantia nigra''' nuclei are involved in the '''control of voluntary movement'''.

===Crura Cerebri===

===Crura Cerebri===

These are visible on the ventral surface of the mid brain and consist of fibre tracts that are in passage between the telencephalon and the brainstem. The [[Equine Cranial Nerves - Horse Anatomy#Oculomotor Nerve (III)|oculomotor nerves (see above) also emerge in this region of the mid brain, directly rostral to the pons.

These are visible on the ventral surface of the mid brain and consist of fibre tracts that are in passage between the telencephalon and the brainstem. The [[Equine Cranial Nerves - Horse Anatomy#Oculomotor Nerve (III)|oculomotor nerves]] (see above) also emerge in this region of the mid brain, directly rostral to the pons.

==Hindbrain==

==Hindbrain==