Identify white matter pattern or arbor vitae of cerebellum

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Reference no: EM133878818

Assignment: Biological Sciences

Objectives:

A. List and describe the principal structures of the sheep brain

B. Identify important parts of the sheep brain in a preserved specimen

Materials:

Dissection tools and trays, lab glasses, lab gloves, preserved specimen

Procedure:

I. External Sheep Brain:

A. Place brain on the tray dorsal side up.

B. Observe the outer membrane (dura mater). (2 inner meninges are the pia mater, and the arachnoid mater).

C. Cut off the dura mater and expose the cerebrum. Observe the gyri (ridges) and the sulci (grooves).

D. Identify the longitudinal fissure, which separates the right and left hemispheres of the brain.

E. Locate the frontal, 2 parietals, 2 temporal, and the occipital lobes of the brain.

F. Observe the ventral surface of the brain. Get the instant assignment help.

G. Locate the optic chiasm, pons, cerebellum, medulla oblongata, olfactory bulbs, and the optic nerves.

829_External Sheep Brain.jpg

1539_External Sheep Brain-.jpg

II. Internal Sheep Brain:

A. Use a knife or long-bladed scalpel to cut the specimen along a midsagittal plane. Use the longitudinal fissure as a cutting guide.

B. The corpus callosum had been connecting the two cerebral hemispheres and can now be clearly You may be able to see a hollow cavity just ventral to the corpus callosum in each brain half. These cavities are the lateral ventricles that contain cerebrospinal fluid.

C. Return your attention to the midsagittal section. Identify the white matter pattern, or arbor vitae, of the cerebellum.

D. Locate the pineal body and optic chiasma. In this section, only the intermediate mass of the thalamus is visible. It appears as a circle of gray matter surrounded by the shallow section of the third ventricle.

E. Identify the pons and medulla in the midsagittal section.

1144_Internal Sheep Brain.jpg

28_Internal Sheep Brain-.jpg

A. Name some similarities between the Human Brain and the Sheep Brain.

B. Discuss some differences between the Human Brain and the Sheep Brain.

C. Describe the Cerebrum (appearance, shape, color, etc.).

D. Describe some differences between the Cerebrum, Cerebellum, and the Medulla.

Reference no: EM133878818

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