Inferior oblique muscle of the eye – Human Anatomy | Kenhub

Hey everyone! This is Matt from Kenhub, and in this tutorial,
we will be discussing the inferior oblique muscle, its origin and insertion, function,
innervation and blood supply. The inferior oblique muscle is one of the
six extraocular muscles that control movements of the eye. Of the six extraocular muscles, four are rectus
muscles and two are oblique muscles. The inferior oblique is situated primarily
on the inferior aspect of the eye while the other oblique extraocular muscle – the superior
oblique – lies primarily on the superior aspect of the eye. The inferior oblique muscle originates from
the orbital surface of the maxilla just lateral to the nasolacrimal groove. It is important to note that this is the only
extraocular muscle that does not originate from the common tendinous ring also known
as the annulus of Zinn. The inferior oblique muscle inserts onto the
posterior, inferolateral surface of the eye just inferior to the insertion of the superior
oblique muscle. The inferior oblique’s point of insertion
is covered by the lateral rectus muscle as you can see here. When the eye is in a neutral position, the
inferior oblique is responsible for extorsion which is rotation of the eye outwards, elevation
which is movement of the eye superiorly, and abduction which is movement of the eye laterally
away from the nose. The nerve supply to the inferior oblique comes
from the inferior branch of the oculomotor nerve – the third cranial nerve. Arterial blood is supplied to the inferior
oblique muscle by branches off of the infraorbital artery. This tutorial might be over, but there are
more videos you can watch related to this topic. You can also subscribe to our YouTube channel
or go to our website where you’ll find fun quizzes, related articles, and atlas sections
– all you need to kick some gluteus maximus in anatomy and histology. I’ll see you soon!


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