LAB 7
CRANIAL NERVES
A. Objective: To Learn the location and function of all 12 pairs of cranial nerves.
1.
Obtain a sheep brain. Carefully remove any remnants of the dura mater, being careful not to tear any cranial nerves
that are still attached to the membrane. Locate each pair of nerves that are still intact on the brain. Travel around
the room to observe other sheep brains that may still have the nerves not found on your specimen. Review the
function of each nerve.
B. Label the numbered structures on the human brain diagram below
1
3
2
4
5
6
7
8
9
12
10
11
13
15
14
VENTRAL VIEW
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QUESTIONS [Refer to the diagram on the previous page to answer the following questions]
1.
Why is the function of structure #11 so crucial to normal life function?
2.
Name structures #4, #8, #10, and #11. What do these four nerves have in common?
3.
Name the nerves that are sensory only.
4.
Which nerve innervates four of the six extrinsic eye muscles?
5.
Which two nerves transmit impulses regarding taste from the tongue? Describe which area of the tongue is
innervated by each nerve.
6.
Which nerve innervates the trapezius muscle?
7.
Damage to which nerve might result in difficulty swallowing and loss of salivation from the parotid gland?
8.
What non-parasympathetic function does the Vagus nerve have?
9.
Which nerve innervates the muscles of the tongue?
10. Name the three branches of structure #6 and differentiate between the region and function of each
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CRANIAL NERVES
NAME
NUMBER
MOTOR,
SENSORY or
BOTH?
I
II
III
IV
V1
V2
V3
28
SPECIFIC AREA
SUPPLIED
AUTONOMICS?
(Yes or no and what is
supplied if yes)
CRANIAL NERVES
NAME
NUMBER
MOTOR,
SENSORY or
BOTH?
VI
VII
VIII
IX
X
XI
XII
29
SPECIFIC AREA
SUPPLIED
AUTONOMICS?
(Yes or no and what is
supplied if yes)