Question
Which of the following muscle is supplied by the nucleus present beneath the area marked by the arrow below? Mark the image
A. Risorius
B. Lateral rectus
C. Inferior oblique
D. Medial pterygoid
Show Answer
Correct Answer » B
Explanation
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Ans: B. Lateral rectus
(Ref: Gray’s 41/e p275. 40/e p240)
- The marked structure is facial colliculus.
- Abducent nerve nucleus is located deep to facial colliculus.
- Supplies lateral rectus.
Facial colliculus:
- Situated in pons.
- Overlies abducent nucleus.
- Facial nerve originates from its nucleus & goes around abducent nerve.
- This is called as neurobiotaxis.
- Formed by axons of facial nerve (not by abducens nucleus deep to it).
Muscle |
Nerve Supply |
Superior rectus |
Oculomotor (Superior division)° |
Inferior rectus |
Oculomotor (Inferior division)° |
Medial rectus |
Oculomotor (Inferior division)° |
Lateral rectus |
Abducens° |
Superior oblique |
Trochlear° |
Inferior oblique |
Oculomotor (Inferior division)° |
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