Trochlear Nerve Flashcards Preview

Spinal Anatomy I - Exam 3 > Trochlear Nerve > Flashcards

Flashcards in Trochlear Nerve Deck (10)
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1
Q

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

A

somatic efferent (SE)

2
Q

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

A

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

3
Q

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

A

somatic efferent pathway

4
Q

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

A

trochlear motor nucleus

5
Q

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

A

dorsal surface of the midbrain

6
Q

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

A

right side

7
Q

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

A

it decussates

8
Q

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

A
  • 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
9
Q

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

A

the right side muscle

10
Q

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

A

superior oblique

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