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BIO 117

Muscular System (Major Muscles of the body)

MuscleLocation, DescriptionFunction
Orbicularis oculi circular muscle around eye closes eyes; winking, blinking, and squinting
Levator palpebrae superioris origin on bony orbit of eye; inserts on upper eyelid Elevates eyelid (opens eye)
Orbicularis oris Encircles mouth closes, purses lips; kissing muscle
Buccinator Horizontal cheek muscle; origin on maxilla and mandible; inserts on orbicularis oris flattens cheeks; trumpeter's muscle; whistling muscle; helps with chewing by positioning food between teeth
Zygomaticus Origin on cheekbone; inserts on corner of mouth elevates corner of mouth; smiling muscle
Platysma Origin in fascia of shoulder and anterior chest; inserts on mandible, angle of lower mouth, soft tissue of lower face pouting muscle; "open your mouth wide" muscle
Temporalis flat fan-shaped muscle over temporal bone (origin); inserts on mandible closes jaw; retracts jaw
Masseter covers lateral part of lower jaw; origin on maxilla, zygomatic process of the temporal bone; inserts on mandible closes jaw; retracts jaw
Sternocleidomastoid extends along each side of neck; strong narrow muscles that extend obliquely from sternum and clavicle; origin upward to mastoid process of temporal bone (insertion) contraction of both muscles flexes the head at the neck; contraction of one rotates head toward opposite side
Trapezius large, flat, trapezoid-shaped muscle on back of neck and upper back; origin on occipital bone, C7, and all thoracic vertebrae; inserts on clavicle and scapula hyperextends head so as to look up in the sky; lateral flexion of head
Scalenes Origin on cervical vertebrae (C1-C7); insert on rib 1 and 2 act synergistically with sternocleidomastoid to flex neck
Frontalis Flat muscle covering forehead; origin on cranial aponeurosis; inserts on skin above eyebrows Raises eyebrows; surprised look; wrinkles forehead
Created by: Ekane34
 

 



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