EXCRETORY SYSTEM
MUSCLE ARRANGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Have a broad origin
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Fascicles are in a circular pattern and are arranged in concentric rings
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Examples are muscles that surround the eyes
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None of the above
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Detailed explanation-1: -The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.
Detailed explanation-2: -The orbicularis oculi muscles are the main protractors (closure) of the eyelids. It is a flat, ringlike band of skeletal muscle surrounding the anterior orbit composed of three parts: the orbital portion, the palpebral portion, and the lacrimal portion.
Detailed explanation-3: -EXTRAOCULAR MUSCLES: There are six muscles that attach to the eye to move it. These muscles originate in the eye socket (orbit) and work to move the eye up, down, side to side, and rotate the eye.
Detailed explanation-4: -The tiny muscles that make up the iris, known as the circular and radial muscles, relax and contract to maintain a fairly constant level of light entering the eye. In bright light, the circular muscles contract whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye.
Detailed explanation-5: -Lateral Rectus. The lateral rectus is a muscle of the eye’s orbit. Medial Rectus. The medial rectus is also a muscle of the eye’s orbit. Inferior Rectus. The inferior rectus is also a muscle of the orbit. Superior Rectus. Superior Oblique. Inferior Oblique. 18-Oct-2019