Brain Dissection Guide

Illustrated by Veronica Zoeckler

470219-956 © 2016 Ward’s Science All Rights Reserved

Ventral View with Dura Mater

Olfactory lobes

Optic nerve

Dura mater Optic chiasma

Oculomotor nerves

Trigeminal nerves

Spinal cord

Illustrated by Veronica Zoeckler 1 © 2016 Ward’s Science All Rights Reserved Removing Dura

Carefully remove the dura mater from the brain. Be extremely careful when removing the membrane from around the optic, oculomotor, and trigeminal nerves and around the hypophysis (pituitary gland).

© 2016 Ward’s Science All Rights Reserved 2 Illustrated by Veronica Zoeckler Dorsal View

Cerebrum

Sulci

Gyri Longitudinal ssure

Cerebellum

Illustrated by Veronica Zoeckler 3 © 2016 Ward’s Science All Rights Reserved Cranial Nerves

I. Olfactory

II. Optic

Optic chiasma

Temporal lobe Pituitary gland* III. Oculomotor VI. Abducens V. Trigeminal IV. Trochlear VII. Facial VIII. Acoustic IX. Glosso- pharyngeal X. Vagus XI. Spinal Pons accessory

Medulla Cerebellum oblongata XII. Hypoglossal

* Due to preservation processes, the pituitary gland may or may not Spinal cord be present in your specimen.

© 2016 Ward’s Science All Rights Reserved 4 Illustrated by Veronica Zoeckler Bisection

Using a large scalpel, cut along the longitudinal ssure to divide the brain into two halves. See the next page to locate the various features of the brain on your cross section.

Illustrated by Veronica Zoeckler 5 © 2016 Ward’s Science All Rights Reserved Sagittal View

Gray matter Corpora quadrigemina Cerebellum White matter

Arbor vitae

Corpus callosum Thalamus Pituitary Hypothalamus gland Medulla Midbrain Pons oblongata

© 2016 Ward’s Science All Rights Reserved 6 Illustrated by Veronica Zoeckler Functional Divisions

The Forebrain

The forebrain is made up of the cerebrum, thalamus and hypothalamus. Sensory information is processed here. The forebrain also stores memories. The thalamus directs and relays sensory information in the cerebrum. The hypothalamus connects the nervous system to the endocrine system via the pituitary gland.

The Midbrain

The midbrain is above the pons. It plays a role in eye movement and pupil size. It also helps to integrate The Hindbrain sensory information from the eyes and ears to ne The hindbrain consists of tune muscle movement. the cerebellum, medulla oblongata and pons. Many autonomic functions, such as breathing and blood pressure, are controlled by the hindbrain.

Illustrated by Veronica Zoeckler 7 © 2016 Ward’s Science All Rights Reserved Quiz

1

Cranial Nerves 2

9 3 10 4 5 11 6 12 7

8

2 3 4 1 Sagittal View 5

12 11 9 10 8 7 6

© 2016 Ward’s Science All Rights Reserved Illustrated by Veronica Zoeckler Answer Key

Cranial Nerves 1. I. Olfactory 2. II. Optic 3. VI. Abducens 4. V. Trigeminal 5. VII. Facial 6. IX. Glossopharyngeal 7. XI. Spinal accessory 8. XII. Hypoglossal 9. III. Oculomotor 10. IV. Trochlear 11. VIII. Acoustic 12. X. Vagus

Sagittal View 1. White matter 2. Gray matter 3. Corpora quadrigemina 4. Cerebellum 5. Arbor vitae 6. Medulla oblongata 7. Pons 8. Midbrain 9. Hypothalamus 10. Pituitary gland 11. Thalamus 12. Corpus callosum

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