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Lateral Ventricle in Sheep Cerebral Hemisphere
The hippocampus and fornix have been removed in this isolated cerebral hemisphere to show the lateral wall of the lateral ventricle. The caudate nucleus can be seen rostrally in the wall of the ventricle
Dissected Sheep Brain — Dorsal View
The top of the telencephalon has been removed to reveal lateral ventricles bilaterally. Notice that the floor of the lateral ventricle is formed by hippocampus (yellow), fimbria (green), and fornix (orange). Rostrally, the ventricle is bounded laterally by caudate nucleus (blue). (The red pic is in cerebral cortex and the white pic is in white matter (internal capsule).
Cranial Nerves — Canine Brain
Roots of the twelve cranial nerves are colored red (except olfactory nerves are not colored). Cranial nerves arise from the brainstem, except olfactory nerves which join the olfactory bulb. The trochlear nerve (IV) exits from the dorsal surface of the brainstem. Although it is regarded as a cranial nerve, the optic nerve (II) is embryologically and histologically an extension of the brain.
Isolated Cerebellum — Ventral View
The cerebellum has been removed from the pons by cutting three cerebellar peduncles (white pics). The red pic in in the nodulus of the vermis. The orange pic is in the right flocculus. A flocculonodular tract (yellow) connects the two regions.
Canine Brain Illustration — Dorsal View
The vermis of the cerebellum is colored red in this dorsal view of an illustrated dog brain. The vermis is flanked bilaterally by cerebellar hemispheres
Sheep Hindbrain — Median View
The cerebellar vermis is sectioned sagittally in this median view of a sheep hindbrain. The vemis is divisible into about ten lobules; the most caudal lobule is the nodulus. Ventral to the cerebellum, the fourth ventricle is roofed by rostral and caudal medullary vellum. The latter gives rise to bilateral choroid plexuses.
Equine Metencephalon — Rostrolateral View
The cerebellar vermis and left cerebellar hemisphere, including the flocculus, are visible in this rostrocaudal view of an equine metencephalon. Transverse pontine fibers of the pons form the middle cerebellar peduncle, through which the trigeminal nerve exits.
Equine Hindbrain — Lateral View
The cerebellum is seen from a lateral view. The red pic is in the primary fissure which divides the cerebellum into cranial and caudal lobes. The green pic indicates the flocculus of the cerebellar hemisphere. The middle cerebellar peduncle (orange) is composed of transverse pontine fibers (blue) entering the cerebellum.
Equine Hindbrain — Lateral View
The cerebellum is seen from a lateral view. The red pic is in the primary fissure (the first fissure to develop embryologically); it divides the cerebellum into cranial and caudal lobes. The green pic indicates the flocculus of the cerebellar hemisphere. The middle cerebellar peduncle is composed of transverse pontine fibers entering the cerebellum.
Canine Brain Section
The mesencephalon (midbrain) is at the center of this transverse section through a canine brain. Notice the mesencephalic aqueduct near the center of the midbrain. Rostral colliculi occupy the tectum, the region dorsal to the aqueduct. The fiber bundle at the ventral surface of the midbrain is crus cerebri. Substantia nigra is dorsal to the crus and further dorsal is midbrain tegmentum. (The bilateral gray “ears” are medial geniculate nuclei of the diencephalon.).
Equine Brainstem — Dorsal View
A dorsal view of the equine brainstem is illustrated (part of the left side has been cut away). The rostral colliculus is marked by an orange pic; the caudal colliculus is immediately caudal to it. The bilateral colliculi are connected across the midline by commissures. Trochlear nerves decussate in the rostral medullary vellum, just caudal to the commissure of the caudal colliculus.
Canine Brain Section
The diencephalon is at the center in this transverse section through a canine brain. Visible are: habenular nuclei, thalamus, hypothalamus, tuber cinereum (which gives rise to the missing infundibulum & neurohypohysis), and optic tracts.
Dissected Sheep Brain — Dorsal View
The telencephalon has been dissected to reveal the underlying diencephalon, including: thalamus (pink), habenular nuclei (red), pineal body (yellow), and third ventricle (green). Also labeled bilaterally are: midbrain rostral colliculus (white) and hippocampus (blue) and caudate nucleus (orange) of the telencephalon.
Sheep Brain — Ventral View
The ventral surface of the diencephalon features three structures in rostro-caudal order: optic chiasm (green pic), infundibulum (orange), and mamillary bodies (red). The infundibulum is a hollow stalk that connects to the neurohyphysis, which is missing in this specimen. Non-diencephalic structures also labeled in this specimen are: crus cerebri (yellow), pons (white), trapezoid body (blue), and pyramid (green).
Canine Brain Section
The telencephalon is shown in this transverse section through a canine brain. Cerebral cortex forms surface gray matter while deep gray matter constitutes basal nuclei (caudate nucleus, putamen, globus pallidus, etc.). White matter (stained blue) is deep to the cortex. Notice the white matter commissure (corpus callosum) passing between the two hemispheres. White mater squeezed between basal ganglia is called internal capsule. The lateral ventricle is bounded laterally by caudate nucleus, dorsally by corpus callosum, and medially by the septal region (septum).