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Overview of the 7 Extraocular Muscles – Orbital Muscles and Innervation

by Craig Canby, PhD
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    Welcome to this presentation on orbital muscles and their innervation. When we think about the orbital muscles, we’re going to have two groups of muscles. The major group would include six muscles that actually attach to the eye and move the eye. Then the other group is a one muscle group. We’ll be able to look at these muscles individually as we work through this presentation. We’ll also want to understand their innervation and their actions when they are activated. To shorten, this is very useful in the physical examination of extraocular movements to determine whether or not their innervation remains intact. We’ll explore this in much greater detail when we get to the cranial nerve lecture. We’re first going to focus on the six muscles that attach to the eyeball. Those are shown here on the image on the screen. We have two muscles that are obliquely oriented, the superior oblique and the inferior oblique. Then the other four muscles that attach to the eyeball are recti muscles. Members of the recti component here would be the superior rectus, inferior rectus, medial rectus, and the lateral rectus. So let’s explore this in greater detail so you have an understanding of their orientation within the orbit and the manner in which they attach to the eyeball. Here, we’re looking at the superior oblique. We’re looking at the medial aspect of the orbit. We see the origin here from the annular tendon and it will course on the medial upper side of the orbit. Then it will run through a pulley-like structure and that is referred to as the trochlea. That’s in the upper medial corner of your orbit. Then once it passes through the trochlea, it will then course laterally and posteriorly to attach to the eyeball. The counterpart here...

    About the Lecture

    The lecture Overview of the 7 Extraocular Muscles – Orbital Muscles and Innervation by Craig Canby, PhD is from the course Head and Neck Anatomy.


    Included Quiz Questions

    1. Levator palpebrae superioris
    2. Inferior oblique muscle
    3. Medial rectus
    4. Lateral rectus
    5. Superior oblique muscle
    1. Trochlea
    2. Superior orbital fissure
    3. Foramen ovale
    4. Foramen rotundum
    5. Inferior orbital fissure

    Author of lecture Overview of the 7 Extraocular Muscles – Orbital Muscles and Innervation

     Craig Canby, PhD

    Craig Canby, PhD


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