The brains arrive crudely prepared as seen in this lateral view and ventral view. There is tissue, and meninges. The white film is dura mater.

TheLateral view of the sheep brain showing cerebrum, cerebellum, brainstem. Rhinal fissure and olfactory bulb are conspicuous. See slide 1

Dorsal view of the sheep brain. Longitudinal fissure separates cerebral hemispheres. Vermis is between cerebellar hemispheres. See slide 2

Wide angle of the ventral surface of the brain with all the associated structures. See slide 4

Close-up of ventral brain centered on optic chiasm. This view is good for circle of Willis fed by the stump of the internal carotid artery visible to the left. See slide 3

Close-up of anterior portion of ventral surface of the sheep brain. This view is especially good for the lateral and medial olfactory stria, mammillary body, oculomotor nerve and cerebral peduncle. See slide 5

With one optic nerve removed, the diagonal band is visible in this close-up of the ventral part of the sheep brain. This view is also good for the trigeminal nerve on one side. See slide 6

This closeup of the posterior ventral lateral part of the sheep brain is good to show the abducens nerve and the choroid plexus. See slide 7

In this close-up of the venttral surface of the sheep brain, glossopharyngeal and vagus nerve have been teased apart and the (spinal) accessory nerve is clear. See slide 8

White and gray matter of cerebrum and cerebellum are compared. See slide 22

The removal of gray matter reveals the crown like appearance of arcuate fibers collectively referred to as the corona radiata. See slide 23

This midsagittal cut reveals all the structures in such a cut. Most of the septum pellucidum is intact here. See slide 9

This close-up of the midsagittal cut is good to show anterior commissure, massa intermedia of thalamus, third and fourth ventricles, habenula, and lamina quadrigemina of the colliculi, in addition to the more famous structures. See slide 10

This tract dissection of the midsagittal cut reveals the fornix, the mammilo-thalamic tract and the habenulo-peduncular tract. The head of the caudate is seen past the septum through the lateral ventricle. See slide 11

Here is one of the 2 cuts you would make to cut out a pie wedge of the cerebral cortex to reveal the hippocampus. See slide 13

Bent apart, the hippocampus looks white from the surface layer of fimbria fibers which form the fornix. See slide 14

This peeling apart toward the midsagittal cut more clearly reveals fimbria forming into fornix. See slide 16

Further pulling tears some fibers of the internal capsule between caudate and hippocampus. See slide 17

With trimming, caudate and hippocampus are clear. See slide 18

With the hippocampus removed, the optic tract to lateral geniculate nucleus connection is revealed as well as the superior and inferior colliculi. See slide 19

With the cerebellum removed, the floor of the fourth ventrical is viewed, and the cerebellar peduncle is teased into brachium pontis, brachium conjunctivum and restiform body. This is a good view of superior and inferior colliculi. See slide 20

With gray matter removed, the lateral aspect of the cerebellar peduncle is seen. See slide 21

This dorsal horizontal section is good to reveal the caudate. The hippocampus is nicked. See slide 15

This horizontal section shows how branches of the internal capsule give the basal ganglia the nick name "striatum." and how the putamen and globus pallidus pool structurally to make the lens shaped lenticular nucleus. Lateral geniculate nucleus and hippocampus are sectioned caudally. See slide 12

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This page was last updated 9/17/98