In adducted eye, action of superior oblique muscle of the eye is
Correct Answer: Depression of the eyeball
Description: Ans. b (Depression of the eye ball) (Ref. Ganong Physiology 21st ed., Fig. 8-30; Chapter 8)EYE MOVEMENTS# Since the oblique muscles pull medially, their actions vary with the position of the eye. When the eye is turned nasally, the inferior oblique elevates it and the superior oblique depresses it. When it is turned laterally, the superior rectus elevates it and the inferior rectus depresses it.# Extraocular muscles subserving the six cardinal positions of gaze. The eye is adducted by the medial rectus and abducted by the lateral rectus. The adducted eye is elevated by the inferior oblique and depressed by the superior oblique; the abducted eye is elevated by the superior rectus and depressed by the inferior rectus. EO muscleNerve supplyPrimary actionSecondary actionTertiary actionMedial rectusCN IIIAdduction----Superior rectusCN IIIElevationIntortionAdductionInferior rectusCN IIIDepressionExtortionAdductionInferior obliqueCN IIIExtorsionElevationAbductionSuperior obliqueCN IVIntorsionDepressionAbductionLateral rectusCN VIAbduction----Extraocular muscles subserving the six cardinal positions of gaze:# The eye is adducted by the medial rectus and abducted by the lateral rectus.# The adducted eye is elevated by the inferior oblique and depressed by the superior oblique.# The abducted eye is elevated by the superior rectus and depressed by the inferior rectus.
Category:
Ophthalmology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now