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EXERCISE
C2
Cat Nervous System
MASTER LIST OF MATERIALS
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Gloves
Safety glasses
Dissecting tools
Dissecting tray
String
Preserved cat
TIME REQUIREMENT
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Preparing the Cat for Dissection: 15–20 minutes
The Brachial and Sacral Plexuses: 30–45 minutes
The Spinal Cord: 20–30 minutes
Clean up: 15 minutes
LABORATORY PREPARATION
1. Place preserved cats and large dissecting trays in the lab. Supply heavy tags for
students to identify their cat.
2. Provide preservative in squeeze bottles or spray bottles for students to keep the
specimens moist.
3. Set up a disposal area with a biohazard container for discarding scrap tissue. Also
prep a cleaning station for washing trays and tools.
TEACHING TIPS AND STUDENTS’ MISCONCEPTIONS
Lab Activity 1 – Preparing the Cat for Dissection
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Demonstrate correct dissection technique for each tool, especially the blunt probe.
Instruct students not to tear tissue during the dissection. Only cut on the specimen
when it is called for in the procedures and it is verified by the dissection team that the
correct structure has been selected to cut.
Remind students to follow procedures carefully to open the ventral body cavity
without damaging the internal organs.
Monitor students during dissection and ensure that students are following safety
guidelines and are correctly dissecting the specimen.
Lab Activities 2 and 3 – Brachial and Sacral Plexuses
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Nerves are very delicate and easy to damage during dissection. Remind
students to use their blunt probe to free tissues and structures away from
nerves. Trace nerves into muscles before cutting deep.
Remind students not to use water to moisten the specimens, it will promote
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198 Instructor’s Manual for Laboratory Manual for Anatomy & Physiology, Fourth Edition
bacterial growth and decay. Keep the specimen moist with the preservative.
 All scrap tissue must be discarded into the biohazard container.
Lab Activity 4 – The Spinal Cord
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Carefully dissect and reflect the back muscles to expose the vertebral column.
Then use bone cutters to snip the vertebral lamina to access the meninges and
spinal cord.
Remove a section of spinal cord and place under a dissecting microscope for
students to observe
Copyright © 2010 Pearson Education, Inc.
Dissection Exercise 2: Cat Nervous System
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EXERCISE
C2
Answers to Questions
LABORATORY REPORT
A. Matching
1. D
2. B
3. C
4. A
5. F
6. E
7. H
8. I
9. G
B. Short-Answer Questions
1. The brachial plexus of the cat is a network of intertwining cervical nerves C6, C7,
and C8 and thoracic nerve T1. The plexus innervates muscles and other structures
of the shoulder, forelimb, and thoracic wall. In humans, the brachial plexus
involves nerves C5 – T1.
2. The three major nerves of the sacral plexus are the large sciatic nerve, the tibial
nerve on the medial side of the hindlimb, and the common fibular nerve on the
lateral side of the hindlimb.
3. The meningeal layers of the spinal cord are the superficial dura mater, the middle
layer is the arachnoid mater, and laying on the spinal cord is the pia mater.
C. Analysis and Application
1. The major nerves of the forelimb are the radial nerve that innervates the triceps brachii, the
musculocutaneous nerve that controls the coracobrachial and biceps brachii muscles and the
skin of the forelimb. The median nerve supplies muscles of the ventral antebrachium and
forelimb, and the ulnar nerve supplies muscles of the antebrachium.
2. In the spinal cord, gray matter is central and organized into horns and the white matter is
peripheral and grouped into white columns.
Copyright © 2010 Pearson Education, Inc.