Study Guides (258,787)
CA (125,011)
UTSC (8,100)
NROB60H3 (24)

dissection guide

13 Pages
94 Views

Department
Neuroscience
Course Code
NROB60H3
Professor
Janelle Leboutillier

This preview shows pages 1-3. Sign up to view the full 13 pages of the document.
Sheep Brain Dissection Guide Page 1
DISSECTION OF THE SHEEP'S BRAIN
Introduction
The purpose of the sheep brain dissection is to familiarize you with the three-
dimensional structure of the brain and teach you one of the great methods of studying the
brain: looking at its structure. One of the great truths of studying biology is the saying
that "anatomy precedes physiology". You will get sick of me saying that phrase this
phrase if I teach well. What this phrase means is that how something is put together tells
us much about how it works. My challenge to you with this exercise and throughout the
term will be to examine a structure and think what this means about the operation of the
brain. Your ideas can be as valid as anyone else's who has tackled this delightfully
impossible task if you think carefully
While the course will emphasize the human brain, observation and evolution
indicate that there are many similarities between the sheep brain and the human brain.
Even the differences are instructive and help us to learn about the brain. Being able to
locate important structures in the sheep brain will be of great benefit to understanding
how structures are related to each other in the human brain. If the same structure exists in
both brains (and most structures are the same), they are in the same relative location.
During the course of the dissection, I will point out some of the differences between
brains so that you will be better able to appreciate the development of the human brain.
It is extremely important for the rest of the class that you learn the structure of the
sheep's brain well. In the rest of the course, we will regularly refer to structures that we
examine in this dissection.
Please follow the following steps in order. All terms that you need to know are in
bold italics the first time they are listed.
Materials and Preparation
1. Before beginning inspection and dissection of the brain you should have these
materials on hand:
dissection pan dissection kit:
brain scalpel
probe
scissors
2. The brains are stored in a preservative solution. To minimize the drying of your
hands, rinse the brain under a slow stream of running water before proceeding
with the dissection. When not in use, the brains should be stored in preservative
solution in the container given to you and sealed tightly.
3. These steps will need to be repeated prior to each laboratory session.
www.notesolution.com
Sheep Brain Dissection Guide Page 2
Procedure
Directions.
Before beginning the dissection of the sheep brain you will need to know the
terms used to specify the location and relative location of various brain structures. Below
are illustrations of direction. All these terms are both absolute and relative. Let me
explain that. Let us take lateral. It both means at the side of the brain, and closer to the
side. So some structure that is quite in the middle can be lateral to another structure that
is even closer to the middle of the brain. To summarize, anterior or rostral mean in the
front or towards the front. Posterial or caudal is at or towards the back Lateral means
on the side or towards the side. Medial is at or towards the middle. Dorsal means on
top, in the brain and head only, and ventral means on the bottom, in the brain and head
only. The positions and directions are illustrated in the next two illustrations.
Dorsal
Ventr
al
Anterior
or
Rostral
Media
l
Latera
l
Posterior
or
Caudal
Anterior
or
Rostral
Posterior
or
Caudal
www.notesolution.com
Sheep Brain Dissection Guide Page 3
Planes of Orientation.
In addition to the direction, the brain as a three dimensional object can be divided
into three planes. There is the frontal or coronal planes which divides front from back.
It can divide the brain and any location as long as it divides the brain from front to back.
Next are the saggital planes which divides the left from the right of the brain. In the
figure below, the most important saggital plane is illustrated the mid-saggital plane.
However, as with the frontal planes, any plane that is parallel to the mid-saggital plane, is
also a saggital plane. The last planes are the horizontal planes that divide the brain in to
top and bottom portions. These planes are illustrated with samples in the illustrations
below.
A Frontal or Coronal Plane
A
Saggit
al
Pl
A Horizontal
A Frontal or Coronal
Plane
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Sheep Brain Dissection Guide Page 1 DISSECTION OF THE SHEEPS BRAIN Introduction The purpose of the sheep brain dissection is to familiarize you with the three- dimensional structure of the brain and teach you one of the great methods of studying the brain: looking at its structure. One of the great truths of studying biology is the saying that anatomy precedes physiology. You will get sick of me saying that phrase this phrase if I teach well. What this phrase means is that how something is put together tells us much about how it works. My challenge to you with this exercise and throughout the term will be to examine a structure and think what this means about the operation of the brain. Your ideas can be as valid as anyone elses who has tackled this delightfully impossible task if you think carefully While the course will emphasize the human brain, observation and evolution indicate that there are many similarities between the sheep brain and the human brain. Even the differences are instructive and help us to learn about the brain. Being able to locate important structures in the sheep brain will be of great benefit to understanding how structures are related to each other in the human brain. If the same structure exists in both brains (and most structures are the same), they are in the same relative location. During the course of the dissection, I will point out some of the differences between brains so that you will be better able to appreciate the development of the human brain. It is extremely important for the rest of the class that you learn the structure of the sheeps brain well. In the rest of the course, we will regularly refer to structures that we examine in this dissection. Please follow the following steps in order. All terms that you need to know are in bold italics the first time they are listed. Materials and Preparation 1. Before beginning inspection and dissection of the brain you should have these materials on hand: dissection pan dissection kit: brain scalpel probe scissors 2. The brains are stored in a preservative solution. To minimize the drying of your hands, rinse the brain under a slow stream of running water before proceeding with the dissection. When not in use, the brains should be stored in preservative solution in the container given to you and sealed tightly. 3. These steps will need to be repeated prior to each laboratory session. www.notesolution.com Sheep Brain Dissection Guide Page 2 Procedure Directions. Before beginning the dissection of the sheep brain you will need to know the terms used to specify the location and relative location of various brain structures. Below are illustrations of direction. All these terms are both absolute and relative. Let me explain that. Let us take lateral. It both means at the side of the brain, and closer to the side. So some structure that is quite in the middle can be lateral to another structure that is even closer to the middle of the brain. To summarize, anterior or rostral mean in the front or towards the front. Posterial or caudal is at or towards the back Lateral means on the side or towards the side. Medial is at or towards the middle. Dorsal means on top, in the brain and head only, and ventral means on the bottom, in the brain and head only. The positions and directions are illustrated in the next two illustrations. Lateral Anterior Media l Posterior or or Rostral Caudal Dorsal Posterior or Anterior Caudal or Rostral Ventr al www.notesolution.com
More Less
Unlock Document


Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit