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Dec 22, 2022 · The extraocular muscles are located within the orbit, but are extrinsic and separate from the eyeball itself. They act to control the movements of the eyeball and the superior eyelid. There are seven extraocular muscles – the levator palpebrae superioris, superior rectus, inferior rectus, medial rectus, lateral rectus, inferior oblique and ...
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Apr 22, 2018 · The extraocular muscles. In total, there are seven extraocular muscles. Six of these are responsible for the movement of the eye, with the seventh being responsible for the movement of the superior eyelid. The muscles responsible for the movement of the eye may be divided into the four recti muscles and the two oblique muscles.
- Medical Content
- 18 min
- Bones of the orbit. The bony orbit is made out of seven bones, which include the maxilla, zygomatic bone, frontal bone, ethmoid bone, lacrimal bone, sphenoid bone and palatine bone.
- Eyelid anatomy. The eyelids are soft tissue structures that cover and protect the anterior surface of the eyeball. The anatomy of the eyelid may seem complex, but if we dissolve its multi-layered structure it is actually quite simple
- Lacrimal gland. The lacrimal gland is a part of the lacrimal apparatus, which besides the gland consists of its numerous ducts, the lacrimal canaliculi, lacrimal sac and nasolacrimal duct.
- Eye muscles. There are two groups of eye muscles: Extraocular muscles that move the eyeballs within the orbit. Intrinsic ocular muscles which are within the eyeball itself and control how the eyes accommodate.
Oct 30, 2023 · Extraocular muscles are also referred to as the extrinsic (arising externally) or muscles of the orbit. There are 6 of these extraocular muscles that control eye movement (cows only have 4 of these), and one muscle that controls eyelid elevation. The position of the eye at the time of muscle contraction is what determines how the 6 muscles of ...
- Alice Ferng
- 7 min
- Content Manager
- Lateral Rectus. The lateral rectus is a muscle of the eye’s orbit. The main function of this muscle is to pull the pupil away from the midline of the body.
- Medial Rectus. The medial rectus is also a muscle of the eye’s orbit. The only function of the medial rectus is to bring the pupil closer to the midline of the body.
- Inferior Rectus. The inferior rectus is also a muscle of the orbit. This muscle has multiple functions, mainly helping to extort the eye. The name comes from the Latin, and the word inferior means “lower.”
- Superior Rectus. The superior rectus is mostly in charge of elevation, which means it helps you look up. It has other functions but that is the primary one.
The eye is poised in the fascia and fat of the orbit, and equilibrium is maintained by all the muscles, none of which ever acts alone. Moreover, the two eyes move together in unison (conjugately). Movements may be considered to be around a vertical axis (abduction and adduction), a lateromedial axis (elevation and depression) and even an anteroposterior axis (extorsion and intorsion).
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The trochlea is located on the roof of the orbit medial and anterior to the eye and redirects the tendon of the superior oblique muscle to reach the eye from the anterior and medial direction. Unique among the muscles of the eye, the inferior oblique muscle arises from the maxilla on the medial floor of the orbit and inserts at an oblique angle ...
