CAS BI 108 Lecture Notes - Lecture 8: Orbicularis Oculi Muscle, Zygomatic Arch, Pronator Quadratus Muscle
11 Nov 2016
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Anatomy and physiology 121: muscles of the human body. Epicranius: covers upper cranium, raises eyebrows, surprise, headaches, parts. Orbicularis oculi: ring (sphincter) around eye, blinking, closing, squinting. Orbicularis oris: sphincter muscle of mouth, subcutaneous (between skin and mouth, lip movements, closing, puckering. Buccinator: wall of cheek, forward from ramus of jaw to corner of mouth, compression of cheek (holds food, blows air, purses lips) Zygomaticus: from zygomatic arch to corner of mouth, corner of mouth drawn upward (smiling or laughing) Platysma: sheetlike muscle, from chin, over neck, down to chest, pouting, lowers mandible. Masseter: thick flattened muscle (jaw muscle, extends from zygomatic arch to mandible, raises jaw, chewing. Temporalis: fan shaped muscle above and in front of the ear, from temporal bone, beneath zygomatic arch, to mandible, raises mandible. Sternocleidomastoid: long muscle in side of neck, originates from anterior surface of sternum and upper surface of clavicle, turns head, flexes neck, elevates sternum.
