Comparing the Sheep Brain to the Human Brain – A Visual Guide to Use During Sheep

Brain Dissection Laboratories

Margarita Bracamonte, Ph.D. Northland Community & Technical College,

East Grand Forks, MN

I have edited Dr. Bracamonte’s presentation to better fit our Cameron Human Anatomy course.

- Ron Gaines

Human Brain

Cerebellum

Sheep Brain

Spinal Cord

The human brain (and sheep brain) is made up of four parts:

1. Cerebrum

2. Cerebellum

Human Brain

Sheep Brain Continues…

3. Diencephalon

Human Brain

Sheep Brain 4. Brainstem

4. Brainstem

Midsagittal Section

Ventral View Human BrainSheep Brain

Brainstem

Spinal Cord

Spinal Cord

Structures found in the CerebrumCerebrum

Human BrainSheep Brain

Superior View

Cerebrum – Superior ViewLongitudinal Fissure

Human BrainSheep Brain

Cerebrum

Transverse Fissure

Human Brain – Right Lateral View

Sheep Brain – Superior View

Cerebrum

Human Brain – Lateral ViewSheep Brain – Superior View

Gyri (Gyrus – Singular)

CerebrumSulci (Sulcus – Singular)

Human Brain – Left Lateral ViewSheep Brain - Superior

Cerebrum – Midsagittal ViewSulci - shallow groves between gyri

Human Brain

Human Brain (Right Lateral View)-Cerebral LobesFrontal Lobe Parietal Lobe

Temporal Lobe Occipital Lobe

Gray & White Matter of the CerebrumSheep Brain (Anterior)

(Posterior)

Gray Matter

White Matter

Human Brain

Gray Matter = Cerebral Cortex

Cerebral Cortex

Human Brain

What parts of a neuron are found at the cerebral cortex?

White Matter

Human Brain

What parts of a neuron are found in cerebral white mater?

Corpus Callosum

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Cerebrum

Fornix

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Cerebrum

Lateral Ventricles

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Cerebrum

ThirdVentricle

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Cerebrum

FourthVentricle

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Cerebrum

Structures found at the Cerebellum

Cerebellum

Human Brain

Sheep Brain

Human Brain

Sheep Brain

Midsagittal Section

Cerebellar Cortex(Gray matter)What parts of a neuron are found in the cerebellar cortex?

Human Brain

Human Brain

Sheep Brain

Midsagittal Section

Cerebellar white matter (arbor vitae)

What parts of a neuron are found in the arbor vitae?

Human Brain

Ventral View

Human BrainSheep Brain

Brainstem

Spinal Cord

Spinal Cord

Structures found at the Brainstem

Spinal Cord

Spinal Cord

Pons

Structures found at the Brainstem

Human BrainSheep Brain

Spinal Cord

Spinal Cord

MedullaOblongata

Structures found at the Brainstem

Human BrainSheep Brain

Sheep Brain

Midsagittal Section

Midbrain

Human Brain

Structures found at the Brainstem

Diencephalon

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Diencephalon

Thalamus(mostly intermediate mass)

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Diencephalon

Hypothalamus

Human Brain

Sheep Brain

Midsagittal Section

Structures found at the Diencephalon

Spinal Cord

Spinal Cord

Cranial Nerves – Olfactory Nerve connections

Human Brain – Ventral ViewSheep Brain – Ventral View

Olfactory Bulbs

Spinal Cord

Spinal Cord

Cranial Nerves – Olfactory Nerves

Human Brain – Ventral ViewSheep Brain – Ventral View

Olfactory Tracts

Spinal Cord

Spinal Cord

Cranial Nerves – Optic Nerves

Human BrainSheep Brain

Spinal Cord

Spinal Cord

Optic Nerves Cross at Optic Chiasm

Human BrainSheep Brain

Optic Chiasm Optic Chiasm

Spinal Cord

Spinal Cord

Cranial Nerves – Optic Nerves

Human BrainSheep Brain

Optic Tracts Optic Tracts

Practice your Knowledge of Human Brain Anatomy….

Anterior

Posterior

1. Name the cerebral lobe

Practice your Knowledge About the Human Brain Anatomy….

Anterior

Posterior

2. Name this part of the human brain.

Anterior

Posterior

Practice your Knowledge About the Human Brain Anatomy….

3. Name this partof the human cerebrum

Anterior

Posterior

Practice your Knowledge About the Human Brain Anatomy….

4. Name this partof the brainstem

Inferior view of the human brain.

Practice your Knowledge About the Human Brain Anatomy….

5. Name these nervesInferior view of the human brain.

Practice your Knowledge About the Human Brain Anatomy….

Anterior

Posterior

6. Name this fissure

7. What fills this fissure?

Anterior

Posterior

Answers

1. Temporal lobe2. Cerebellum3. Corpus callosum4. Pons5. Optic nerves6. Transverse fissure7. Tentorium cerebelli