Are extraocular muscle responsible for the closure of the eye?
Answers:
Yes and no. In a literal sense, all the muscles that aren't inside the eye are "extraocular". Closure of the eye is effect by a muscle that is outside the eye (see MJ's answer).
That mortal said, when medical professionals use the term "extraocular muscles" they are if truth be told referring to the muscles on the outside of the eye that are responsible for moving it (i.e., superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique, inferior oblique--mediated by cranial nerves III, IV, and VI). On a physical exam, doctors repeatedly write "extraocular movements intact" (or "EOM intact") to indicate that the patient is moving his eyes customarily and that those cranial nerves are functioning normally. The orbicularis oculi muscle is assessed separately (or more precisely, it is the function of cranial gall VII that you are usually concerned with a bit than the muscle itself).
the muscle responsible for eye closure is called the "orbicularis oculi" its fibers run surrounded by circles around the eye, it's one of the facial muscles and supplied by the facial nerve (the 7th cranial nerve).
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