Week 6

Question 1

1. The somatic nervous system is
   a) responsible for delivering motor signals to the heart
   b) part of the autonomic nervous system
   c) part of the parasympathetic nervous system
   d) responsible for delivering motor signals to skeletal muscles

Answer 1

d) responsible for delivering motor signals to skeletal muscles

Question 2

2. Which of the following is NOT a CNS structure?
   a) the vagus nerve (cranial nerve X)
   b) thalamus
   c) cerebellum
   d) medulla

Answer 2

a) the vagus nerve - cranial nerve X

Question 3

3. Which of the following descriptions of the parasympathetic nervous system is correct?
   a) initiates flight, fright & fight responses
   b) consists of motor neurones that extend all the way from the CNS to the target
   muscle/gland
   c) includes motor neurones that exit the CNS at the sacral region of the spinal cord
   d) innervates skeletal muscles

Answer 3

c) includes motor neurones that exit the CNS at the sacral region of the spinal cord

Question 4

4. The sacral plexus
   a) is where a sciatic nerve originates from.
   b) forms peripheral nerves that innervate muscles of the hand.
   c) originates from the dorsal rami of spinal nerves.
   d) is the point of origin of the vagus nerves.

Answer 4

a) is where the sciatic nerve originates from

Question 5

5. The ______ ________ of several spinal nerves fuse with one another to form
   complicated nerve plexuses, such as the brachial plexus
   a) sympathetic ganglia
   b) rami communicantes
   c) ventral rami
   d) dorsal rami

Answer 5

c) ventral rami

Question 6

6. Which structure of the fibrous tunic in the eye refracts light?
   a) the choroid
   b) the cornea
   c) the lens
   d) the sclera

Answer 6

b) the cornea

Question 7

7. In the retina, ROD cells facilitate
   a) colour vision
   b) vision under low light conditions
   c) the focusing of light onto the retina
   d) the delivery of neural signals to the cochlear nerve

Answer 7

b) vision under low light condition

Question 8

8. Sensory impulses must pass through the following structures in what order to make us
   consciously aware that the skin on our foot has been touched?
9. Somatosensory cortex
10. Spinal cord
11. Thalamus
12. Peripheral nerve

Answer 8

d) 4, 2, 3, 1

Question 9

9. The following structures are components of the inner ear EXCEPT the
   a) cochlea duct
   b) utricle
   c) tympanic membrane
   d) saccule

Answer 9

c) tympanic membrane

Question 10

10. You are asked to attend to an individual who has fallen and received a blow to the head.
    You shine a penlight in their eyes and observe that the pupils remain dilated. This
    observation suggests
    a) the vagus nerves are compressed with a subsequent loss of function
    b) the iris of each eye has received increased stimulation from somatic motor neurones
    c) there is a reduction in sympathetic nervous system stimulation to the eyes
    d) nerves containing neurones servicing the parasympathetic motor system may be
    compressed or otherwise damaged

Answer 10

d) nerves containing neurones servicing the parasympathetic motor system may be
compressed or otherwise damaged