BIOL 030 Lecture Notes - Lecture 11: Temporal Bone, Temporal Muscle, Masseter Muscle

• School: College of The Sequoias
• Department: Biology (BIOL)
• Course: BIOL 030
• Professor: Dewey

Document Summary

Axial muscles: facial expression, mastication, head and neck, thorax, back, abdomen. Muscles of facial expression: frontalis, the muscle that covers the frontal bone and lifts the eyebrows, causing the forehead to wrinkle, orbicularis oculi, a muscle surrounding the eye that forcefully closes the eye when contracted. It originates on the frontal and maxillary bones: zygomaticus, extends from the zygomatic arch to the corners of the mouth. It draws the angle of the mouth superiorly and posteriorly (smiling: orbicularis oris, surrounds the mouth and enables the puckering of lips (kissing muscle). It originates on the maxillary bones or mandible. Muscles that move the head: three muscles involved in moving the head, which are grouped into posterior and anterior muscles, are discussed in this course. Anterior: the sternocleidomastoid muscle flexes the neck with bilateral contraction, and rotates the head to the opposite site with unilateral contraction, muscle terminology: sterno= sternum. , cleido= clavicle, mastoid= mastoid process of the temporal bone.