1. CENTRAL NERVOUS SYSTEM
Dissection of the Sheep Brain
Including Midsagittal, Dorsal and Ventral Sections

2. Dorsal
Anterior
(rostral)
Posterior
(Caudal)
Ventral
2 Cerebral Hemispheres

3. Lateral View
Mid-Saggital View
Sheep
Brain
Human
Brain

4. Lateral View
Mid-Saggital View
Sheep
Brain
Human
Brain

5. Midsagittal Section: Cerebrum and Cerebellum
Parietal lobe
Occiptal lobe
Cerebellum
Cerebrum
Arbor vitae
Fornix
Frontal lobe
Cerebrum consists of two hemispheres, each with 4 lobes: frontal, parietal, occipital, and temporal (lateral view)
corpus callosum -commissural fibers joining right and left hemispheres
fornix - connects ???
Cerebellum - consists of folia (folds) of gray matter
arbor vitae - white tracts in cerebellum
Ventricles - filled with cerebrospinal fluid (CSF)
lateral - within cerebral hemispheres
fourth - between cerebellum and pons
Corpus callosum
Fourth Ventricle

6. Midsagittal Section: Diencephalon - Thalamus & Epithalamus
Third ventricle
Pineal body
Diencephalon consists of epithalamus (pineal body and choroid plexuses of 3rd ventricle), thalamus
Thalamus
Intermediate Mass

7. Midsagittal Section: Diencephalon - Hypothalamus
Mammillary body

8. Midsagittal Section: Brain Stem
Corpora quadrigemina
Fourth ventricle
Pons
Medulla oblongata
Midbrain
Cerebral aqueduct

9. Midsagittal Section: Cerebellum and Spinal Cord
Arbor vitae
Central canal
Spinal cord

10. Dorsal View – Whole Brain
Longitudinal Fissure
Cerebrum
Sulci
Gyri
Corpora quadrigemina
Sulci (sing. sulcus) – grooves between ridges
Gyri (sing. gyrus) – ridges
Cerebellum
Medulla oblongata
Spinal cord

11. Dorsal View – Pineal Body & Corpora Quadrigemina
Superior colliculi
Inferior colliculi

12. Ventral View - Anterior
Olfactory bulb
Olfactory tract
Cerebrum
Pituitary gland

13. Ventral View – Optic Nerve and Chiasma
Optic nerves
Optic chiasma
(dura mater partially removed)
(dura mater intact)

14. Ventral View - Posterior
Cerebellum
Dura mater
Medulla oblongata
Spinal cord

15. Ventral View Without Pituitary
Dura mater
Cerebrum
Hypothalamus
Midbrain
Mammillary body
Pons
Medulla oblongata
Spinal cord

16. Ventral View Without Pituitary – Cranial Nerves
Olfactory bulbs
Optic nerves
Olfactory tract
Optic chiasma
Optic tracts
Trigeminal nerve (V)