CENTRAL NERVOUS CENTRAL NERVOUS SYSTEMSYSTEM

Dissection of the Sheep Dissection of the Sheep BrainBrain

Including Midsagittal, Including Midsagittal, Dorsal and Ventral Dorsal and Ventral

SectionsSections

2 Cerebral Hemispheres

Ventral

Dorsal

Posterior(Caudal)

Anterior(rostral)

HumanBrain

SheepBrain

Lateral View Mid-Saggital View

HumanBrain

SheepBrain

Lateral View Mid-Saggital View

Midsagittal Section: Midsagittal Section: Cerebrum and CerebellumCerebrum and Cerebellum

CerebellumArbor vitae

Cerebrum

Corpus callosum

Occiptal lobe

Fornix

Parietal lobe

Frontal lobe

Fourth Ventricle

Midsagittal Section: Midsagittal Section: Diencephalon - Thalamus & Diencephalon - Thalamus & EpithalamusEpithalamus

Thalamus

Third ventricle

Intermediate Mass

Pineal body

Midsagittal Section: Midsagittal Section: Diencephalon - Diencephalon - HypothalamusHypothalamus

Hypothalamus

Mammillary body

Midsagittal Section: Brain Midsagittal Section: Brain StemStem

Midbrain Cerebral aqueduct

Corpora quadrigemina

Pons Medulla oblongata

Fourth ventricle

Midsagittal Section: Midsagittal Section: Cerebellum and Spinal CordCerebellum and Spinal Cord

Cerebellum

Spinal cord

Central canal

Arbor vitae

Dorsal View – Dorsal View – Whole BrainWhole Brain

Cerebrum

Longitudinal Fissure

GyriSulci

Corpora quadrigemina

Cerebellum

Medulla oblongataSpinal

cord

Dorsal View – Pineal Body Dorsal View – Pineal Body &&Corpora QuadrigeminaCorpora Quadrigemina

Pineal body

Superior colliculi

Inferior colliculi

Ventral View - AnteriorVentral View - Anterior

Pituitary gland

Olfactory bulb

Olfactory tract

Cerebrum

Ventral View – Optic Nerve Ventral View – Optic Nerve and Chiasmaand Chiasma

Optic chiasma

Optic nerves

(dura mater intact)(dura mater intact)(dura mater (dura mater partially partially removed)removed)

Ventral View - PosteriorVentral View - Posterior

CerebellumDura mater

Medulla oblongata

Spinal cord

Ventral View Without Ventral View Without PituitaryPituitary

Pons

Medulla oblongata

Cerebrum

Midbrain

Hypothalamus

Dura mater

Mammillary body

Spinal cord

Ventral View Without Ventral View Without Pituitary – Cranial NervesPituitary – Cranial Nerves

Olfactory bulbs

Olfactory tract Optic nerves

Optic chiasma

Trigeminal nerve (V)

Optic tracts