Trochlear Nerve

Question 1

What type of motor fibers to skeletal muscle are given off by the trochlear nerve?

Answer 1

somatic efferent (SE)

Question 2

What is the embryonic origin of skeletal muscles innervated by the trochlear nerve?

Answer 2

the skeletal muscle is derived from the somites hence somatic efferent (SE)

Question 3

At its apparent origin cranial nerve IV conveys which classification of neural pathways?

Answer 3

somatic efferent pathway

Question 4

What is the location for multipolar SE neurons of the fourth cranial nerve?

Answer 4

trochlear motor nucleus

Question 5

The fourth cranial nerve’s apparent origin is from what location?

Answer 5

dorsal surface of the midbrain

Question 6

Somatic efferent fibers from the left nucleus of the fourth cranial nerve will have an apparent origin from which side?

Answer 6

right side

Question 7

What unique feature of the fourth cranial nerve occurs within the midbrain?

Answer 7

it decussates

Question 8

What are the two unique features of the fourth cranial nerve?

Answer 8

• it is the only cranial nerve with an apparent origin from the dorsal surface of the brain
• it is the only cranial efferent nerve to decussate within the midbrain from its nucleus

Question 9

The right fourth cranial nerve will innervate which side target muscle?

Answer 9

the right side muscle

Question 10

SE fibers from the fourth cranial nerve will innervate which muscle?

Answer 10

superior oblique