Extrinsic Eye Muscles The eye muscles that move the eye and the superior levator loop, known as the trochlea, allowing it to exert an oblique pull on the eyeball. The inferior oblique orbit contains seven muscles: six extrinsicis oriented in a similar manner, but only a portion palpebrae muscle, which raises the upper eyelid. The insertions of these muscles are shown in Figure 25.2. enables movement of the eye in all directions. Their origins are on bones at the back of the orbit. (abel 5) is shown. The interaction of these muscles (label 5) is shown. The interaction of these muscles Note in Figure 25.2 how the optic nerve (yellow) The lateral rectus has been partially removed exits the posterior surface of the eye. in the illustration. Its opposing muscle is the medial rectus (label 2). The superior rectus inserts on the upper surface of the eyeball and is opposed by the in A ferior rectus (label 4) inserted on the lower surface. The superior oblique passes through a cartilaginous Internal Anatomy transverse section of the right eye as seen looking down on it is shown in Figure 25.3. The wall of the eyeball consists of three tunics or layers: an outer Figure 25.3 Internal anatomy of the eye. -Aqueous Humor Choroid Tunic Cliary Body -Cornea Dura Mater 10 11Iris 12Lens 13Optic Nerve Fovea Centralis – _ Optic Disk 14 Pupil 15Retina Sclera Vitreous Humor The Eye

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