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The orbicularis oculi muscle is a flat, elliptical muscle that surrounds the orbit and functions as a sphincter, acting to close the eyelids (Fig. 56-2). Attachments by the palpebral ligaments prevent a circular closure. The medial palpebral ligament is a defined fibrous band connecting the orbicularis oculi muscle with the lacrimal tubercle.
3 wrz 2016 · In contrast to the powerful orbicularis muscle of the equine, ruminant species’ eyelids are much easier to open. However, any eyelid that is being held firmly shut by a patient should not be forced open for examination purposes unless the underlying disease process is known.
11 sie 2016 · The lower eyelid is depressed by the malaris muscle, which is innervated by the dorsal buccal branch of the facial nerve. Note that different branches of the facial nerve supply the orbicularis, which narrows the palpebral fissure, and the malaris, which widens it.
10 paź 2024 · This veterinary anatomical atlas includes 27 scientific illustrations with a selection of labelled structures to understand and discover animal anatomy (skeleton, bones, muscles, joints and viscera). Positional and directional terms are also illustrated.
Intercostal muscles-located between adjacent ribs in the wall of the chest; there are two layers in the depth of the muscle Diaphragm- a large, do me-shaped muscle that is the primary muscle...
22 paź 2022 · The iris muscles consist of a constrictor (sphincter) that encircles the pupil and radial dilator muscles to expand the pupil. The sphincter muscle is an annular band of smooth muscles near the pupillary margin of the iris and is derived from neural ectoderm.
Auriculopalpebral nerve block can be placed to reduce upper eyelid movement before performing a Peterson or retrobulbar block. The auriculopalpebral nerve can be palpated as it crosses the zygomatic arch, roughly 5 cm to 6 cm behind the supraorbital process.
