Module 1 Lesson 4 - 4 (Lab)

Lab - Sheep Brain Dissection

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Introduction

The size and proportions of the various areas of the brain may differ among species, but the locations of various areas of the brain are similar. This investigation uses photographs to teach about the principal structures of the sheep brain.

Problem

What are the principal structures of the brain and what are their functions?

Materials

• Gloves
• Goggles
• Dissection tray
• Dissection tools
• Sheep brain

All images are © 2007 Alberta Education from Learn Alberta.

Procedure

1. Prepare the dissection tray and dissection tools on the bench.


2. Place the sheep brain in the dissecting tray.


3. Observe the brain. The three protective layers of meninges have been removed in this sheep brain. Identify the cerebrum, the two cerebral hemispheres, the cerebellum, and the spinal cord.
   
   


Check Your Work.

Sheep Brain Top View




4. Turn the brain to expose the bottom side. Identify the pituitary gland, the pons, the medulla oblongata, and the olfactory bulbs.
   
   


Check Your Work.

Sheep Brain Bottom View





5. Cut the brain into two lateral sections of left and right hemispheres. Identify the following structures: spinal cord, cerebellum, medulla oblongata, pons, midbrain, thalamus, hypothalamus, pituitary gland, corpus callosum, and cerebrum.
   
   


Check Your Work.

Sheep Brain Side View