Anatomy: The Extraocular Muscles Flashcards
Name the muscle shown in blue
Inferior rectus
Name the origin of the recti muscles
All originate from common tendinous ring
Name the muscles which synergistically depress eyes by working antagonistically as adductors/abductors
Superior oblique and inferior rectus
Name the cranial nerve which supplies all of the extra-ocular muscles with the exception of the lateral rectus and the superior oblique?
CN III (oculomotor nerve)
The medial rectus can only _____ the eyeball
Adduct
When in adduction, the superior oblique can only ______
Depress
What is indicated by the arrow?
Superior tarsus muscle
Which nerve supplies the levator palpebrae superioris?
CN III
The lateral rectus can only _____ the eyeball
Abduct
What is indicated by the arrow?
Orbicularis oculi
How would you test the function of the superior rectus muscle?
Ask patient to look laterally and upward
Name the muscles which synergistically elevate the eyes by working antagonistically as rotators
Superior rectus and inferior oblique
Name the origin of levator palpebrae superioris
Lesser wing of sphenoid
How would you test the function of the inferior rectus muscle?
Ask patient to look laterally and downward
How would you test the function of the lateral rectus muscle?
Ask patient to look laterally
Describe the innervation of the superior tarsal muscle (Mueller’s muscle)
Sympathetic fibres from the superior cervical ganglion