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Major Skeletal Muscles of Head and Neck Chapter 6 Lecture 3 The Skeletal Muscles There are about 650 muscles in the human body. They enable us to move, maintain posture and generate heat. In this section we will only study a sample of the major muscles. Masseter Facial muscle Closes Jaw Zygomaticus Facial muscle Raises corner of mouth during a smile “Smiling” muscle Orbicularis oris Facial muscle Closes and Protrudes (puckers) Lips “kissing” muscle Buccinator Facial and chewing muscle Compresses Cheek (whistling/sucking) and holds food between teeth while chewing Orbicularis oculi Facial muscle Blinks and Closes Eyes Temporalis Chewing muscle Closes jaw Frontalis Facial muscle Raises Eyebrows and wrinkles forehead Sternocleidomastoideus Flexes neck and Rotates Head Trapezius Extend Head, Adduct/Elevate Scapula Platysma Lowers jaw (pulls corners of mouth inferiorly)
