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 © 2016 Ward’s Science All Rights Reserved 5100 West Henrietta Rd • PO Box 92912 • Rochester, NY 14692-9012 • p: 800 962-2660 • f: 800 635-8439 • wardsci.com 0316 300 Lit. No. 83184 ward's+boreal env.lh.indd 2 12/7/2012 9:34:30 AM.