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Jul 9, 2019 · Tonic-type muscle fibers: unique to extraocular muscles, they contract slowly and smoothly. They are associated with smooth pursuit eye movements. The fibers are innervated by multiple grapelike nerve endings (en grappe). Twitch-type muscle fibers: similar to skeletal muscle fibers, they contract rapidly.
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
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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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- 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.
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.
Nov 3, 2023 · Bony cavity within the skull that houses the eye and its associated structures (muscles of the eye, eyelid, periorbital fat, lacrimal apparatus) Bones of the orbit. Maxilla, zygomatic bone, frontal bone, ethmoid bone, lacrimal bone, sphenoid bone and palatine bone. Structure of the eye. Cornea, anterior chamber, lens, vitreous chamber and retina.
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Extraocular muscles are the most specialized skeletal muscles in the human body. These are broadly divided into voluntary and involuntary muscles. The voluntary muscles include seven extraocular muscles that control the movements of the eye and eyelids, and are important for binocular single vision. These include four recti muscles, two oblique ...
