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Muscles A+P

Function, origin and insertion points

masseter closes mouth and retracts mandible maxilla and zygomatic arch ramus of mandible
buccinator presses cheeks against teeth, used for chewing, sucking, whistling and blowing alveolar processes of maxilla and mandible orbicularis oris
sternocleidomastoid extend head, elevates sternum in forced inhalation, and rotates head sternum and clavicle mastoid process
pectoralis major rotates, extends, and flexes arm clavicle, sternum, costal cartilage of 2nd through 6th ribs greater tubercle and intertubercular sulcus of humerus
external oblique flexes and rotates vertebral column, compresses abdomen inferior 8 ribs iliac crest and linea alba
rectus abdominis urination, childbirth, forced exhalation, and flexes vertebral column pubic crest and symphysis cartilage of 5th and 7th ribs, xiphoid process
deltoid (blank) clavicle, acromion, spine of scapula deltoid tuberosity
trapezius elevates scapula, extends head, and stabilizes scapula occipital bone, spines of 7th cervical and athoracic vertebrae clavicle and acromion
biceps brachii flexes forearm, flexes arm scapula, coracoid process of scapula radial tuberosity, bicipital aponeurosis
rectus femorus extends legs, flexes thigh anterior iliac spine patella
gracilis adducts and rotates thigh, flexes leg body and inferior ramus of pubis medial surface of tibia
biceps femoris flexes leg, extends thigh ischial tuberosity, femur head of fibula, lateral condyle of tibia
gastrocnemius plantar flexes foot and flexes leg lateral and medial condyles of femur, knee capsule calcaneus
Pectoralis Major Flex upper arm (blank) (blank)
Created by: ashley814