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FMA. 49033. Anatomical terms of muscle. [ edit on Wikidata] The extraocular muscles, or extrinsic ocular muscles, are the seven extrinsic muscles of the eye in humans and other animals. [1] Six of the extraocular muscles, the four recti muscles, and the superior and inferior oblique muscles, control movement of the eye.
Eye movements are used by a number of organisms (e.g. primates, rodents, flies, birds, fish, cats, crabs, octopus) to fixate, inspect and track visual objects of interests. A special type of eye movement, rapid eye movement, occurs during REM sleep . The eyes are the visual organs of the human body, and move using a system of six muscles.
Human eye. Human eye. The eye of the right side of the face, showing its visible components - a white sclera, a light brown iris, and the black pupil, in its orbit surrounded by the lids and lashes. 1. vitreous body 2. ora serrata 3. ciliary muscle 4. ciliary zonules 5.
The iris (brown coloured portion of the eye) controls the size of the pupil by contracting the sphincter pupillae and dilator pupillae muscles. The sphincter pupillae is the opposing muscle of the dilator pupillae. The pupil's diameter, and thus the inner border of the iris, changes size when constricting or dilating.
There are multiple muscles that control reflexes of blinking. The main muscles, in the upper eyelid, that control the opening and closing are the orbicularis oculi and levator palpebrae superioris muscle. The orbicularis oculi closes the eye, while the contraction of the levator palpebrae muscle opens the eye. The Müller's muscle, or the ...
Iris sphincter muscle. Iris, front view. (Muscle visible but not labeled.) The upper half of a sagittal section through the front of the eyeball. ("Sphincter of pupil" labeled near bottom-center.) The iris sphincter muscle ( pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye ...
The ciliary muscle is an intrinsic muscle of the eye formed as a ring of smooth muscle [ 3 ][ 4 ] in the eye's middle layer, uvea ( vascular layer ). It controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humor into Schlemm's canal.
Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. This is known as the pupillary light reflex. The iris contains two groups of smooth muscles; a circular group called the sphincter pupillae, and a radial group called the dilator pupillae. When the sphincter pupillae contract ...