Download Name Period Date INTRODUCTION - In this exercise we will be

Name
Period
INTRODUCTION
- In this exercise we will be examining the heart and
brain of sheep. Because sheep are mammals just as
humans, they possess a four chambered heart and
similar brain structure to that of humans.
Date
3. Describe the appearance and job or function of these
parts of the heart using available references; record in
Table 1.
REFERENCES



“Sheep Brain Dissection.” Exploratorium 5/12/11
http://www.exploratorium.edu/memory/braindissection/2.html
http://www.wfu.edu/~claybrsd/grad/5420final/labinstruction
s.pdf
Life Science text
OBJECTIVES
 Observe and identify the chambers of the heart
 Observe and identify the regions of the brain
 Make connections between sheep and human organs
MATERIALS
preserved heart
dissecting pan
scissors/scalpel
preserved Brain
probe
forceps
PROCEDURE
PART A – The Heart
1. left ventricle Examine the preserved heart that has been
placed in the dissecting pan.
2. Locate the following parts using Figure 1 as a guide:
Coronary blood vessels, Superior Vena Cava, Aorta,
Pulmonary Vein, Pulmonary Artery
Figure 1.
Table 1. Appearance and Function of Exterior Heart.
Part
Coronary Blood
Vessels
Superior Vena
Cava
Aorta
Pulmonary Vein
Pulmonary
Artery
Appearance
Function (job)
PART B – Chambers of the Heart
1. Locate the Four Chambers of the heart: Left atria, Left
ventricle, Right Atria, Right Ventricle
2. Use scissors to cut through the side of the pulmonary
artery and continue cutting down into the wall of the
right ventricle. Be careful to just cut deep enough to go
through the wall of the heart chamber.
3. Using your scissors, continue to cut open the heart. Start
a cut on the outside of the left atrium downward into the
cutting toward the apex to the septum at the center
groove.
4. Use scissors to cut into the side of the pulmonary artery
and cut down into the wall of the right ventricle.
5. Locate and observe the following: Tricuspid Valve,
pulmonary valve, mitral valve
PART C – THE BRAIN
1. Using the Brain given presented to you. Make an incision
at the midline, separating the right and left lobes.
2. Pull apart the two halves and observe the major
structures of the brain
3. Locate the following structures using Figure 2 as a guide:
4. Describe the location and job or function of the major
structures of the brain using available references;
record in Table 3.
Table 2. Eye Muscle Action
Muscle
Muscle
Name
1
Tricuspid
Valve
2
Pulmonary
Valve
3
Mitral
Val
Directs Flow of
Location
Blood between which
in Heart
2 chambers?
Figure 2.
Table 3. Major Structures of the Brain
Part
location
Function (job)
Cerebellum
Corpus
Callosum
Hypothalamus
Pituitary
Gland
Olfactory
Bulb
Spinal Chord
Pons
Lateral
ventricle
Identify 4 specific safety procedures you followed during this lab.
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1) Describe the sequence of blood flow through the heart
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2) What is White Matter?
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3) What is Grey Matter?
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4) What structure of the human brain is the largest of any mammal?
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