Lab 11
Gross Anatomy of the Brain and Cranial Nerves
Spinal Cord, Spinal Nerves and the Autonomic Nervous System
Exercise 19
Exercise 21
Brain and Cranial Nerves
Activity 1: Identifying External Brain Structures (Consult Lab Exam 2 Review Sheet)
Activity 2: Identifying Internal Brain Structures (Consult Lab Exam 2 Review Sheet)
Activity 3: Identifying and Testing the Cranial Nerves. Note: Cranial nerves will be
tested from Lab Manual Figure 19.9 or Text Figure 13.5. (Consult Lab Exam 2 Review
Sheet)
Dissection: The Sheep Brain. Instructions will be given in class. Please mark changes in
your lab manual. (Consult Lab Exam 2 Review Sheet)
You are not required to touch the dissection, but you are responsible for the material.
Spinal Cord and Spinal Nerves
Use figures in the lab manual and models where appropriate to identify the structures
listed on the review sheet.
Name____________________________
Lab Section ________________
Review Sheet
Sheep Brain Dissection
Compare the size of the cerebral hemispheres, brain stem and olfactory lobe in the sheep
brain to the preserved human brain when answering below.
1. Which is (are) larger in the human brain? ______________________________
Why do you think this is so?
_______________________________________________________________
_______________________________________________________________
2. Which is (are) larger in the sheep brain? ______________________________
Why do you think this is so?
_______________________________________________________________
_______________________________________________________________
3. Which is (are) about the same size in both brains? ___________________________
Why do you think this is so?
_______________________________________________________________
_______________________________________________________________
Gross Anatomy of the Brain and Cranial Nerves
1. Match the labels on the figure with the terms below:
A
B
___ Brain stem
C
___ Central sulcus
D
___ Cerebellum
E
___ Frontal lobe
F
___ Gray matter
G
___ Gyrus
___ Occipital lobe
H
___ Parietal lobe
I
___ Postcentral gyrus
___ Precentral gyrus
J
K
___ Sulcus
L
___ Temporal lobe
M
___ White matter
A
B
C
I
D
E
J
F
K
G
L
H
2. Label on the figure above:
____ Arbor vitae
____ Intermediate mass of thalamus
____ Cerebral aqueduct
____ Medulla oblongata
____ Choroid plexus
____ Occipital lobe
____ Corpora quadrigemina
____ Pineal Gland
____ Corpus callosum
____ Pituitary Gland
____ Hypothalamus
____ Pons
3. Trace the flow of cerebrospinal fluid from the lateral ventricles to the point where it is
returned to the circulatory system in the dural sinus. Use the figure in the text or in
the lab manual.
Lateral Ventricle 
______________________ 
______________________
______________________
Fourth Ventricle 
______________________OR ___________________
OR_____________________ 
4. a. List the three
meninges of the central
___________________
 nervous system.
___________________  Dural Sinus
_____________________
_____________________
_____________________
b. In what major way do the meninges of the spinal cord differ from the meninges of
the brain?
5. The Cranial Nerves. List and learn the name, number, type, part of the brain, and part
of the body associated with each of the cranial nerves. Use Table 19.1
Double-check your answers. There are 3 that are essentially purely sensory, 3 that are
essentially motor, and 5 that are considered mixed.
Name of Nerve
Number of
Nerve
Type
(Sensory,
Motor or
Mixed)
Brain
Association
Forebrain
Forebrain
Midbrain
Midbrain
Pons
Pons
Pons
Pons
Medulla
Oblongata
Medulla
Oblongata
Medulla
Oblongata
Medulla
Oblongata
Spinal Cord
Body
Association
1. Match the labels on the figure with the following terms:
____ Dorsal root
E
A
____ Dorsal root ganglion
____ Dura mater
B
____ Gray matter
F
____ Pia mater
G
____ Spinal nerve
H
____ Spinous process
____ Ventral root
C
I
____ White matter
D
Identifying the Major Nerve Plexuses and Peripheral Nerves
1. Match the four major nerve plexuses with the major nerve - or nerves - associated
with each.
Nerve Plexus
Major Nerve(s)
Femoral
Phrenic
Musculocutaneous, Radial, Ulnar,
Median
Sciatic
Name____________________________
Lab Section ________________
Pre-lab Activity – Eye and Ear.
1. What are the three basic layers of the eyeball?
___________________,
______________________, and ___________________.
2. The transparent part of the outer layer of the eyeball is called the ____________ .
3. The hole in the center of the iris is called the __________ .
4. Put the following terms in the correct order for the pathway of light into the eyeball.
______ Cornea
______ Retina
______ Lens aqueous humor
______ Vitreous humor
______ Pupil
6. The three parts of the ear are the
___________________,
______________________, and ___________________.
7. What is the name of the organ of hearing?
8. Other than hearing, what is another role for the inner ear.
9. Trace the pathway of sound waves into the ear.
______ Auditory canal
______ Perilymph of inner ear
______ Malleus, Incus, Stapes
______ Oval window
______ Tympanic membrane