Origin, Insertion and Action of Muscles Flashcards
Action: flexes and rotates the head at neck
Origin: clavicle and sternum
Insertion: mastoid process of the temporal bone
sternocleidomastoid
Action: elevates the mandible
Origin: maxilla and zygomatic arch
Insertion: mandible
masseter
Action: flexes the vertebral column and compresses the abdomen
Origin: pubic bone
Insertion: ribs and sternum
rectus abdominis
Action: flexes the vertebral column and compresses the abdomen
Origin: Ribs 5-12
Insertion: Iliac crest and the linea alba
External oblique
Action: adducts and medially rotates the humerus
Origin: clavicle and upper ribs
Insertion: proximal humerus
pectoralis major
Action: aids in extension, flexion, internal and external rotation
Origin: lateral clavicle
Insertion: deltoid tubercle of humerus
deltoid
Action: rotates scapula, extends neck
Origin: occipital bone all the way to T12
Insertion: upper fibers of clavicle
trapezius
Action: extends, adducts, rotates arms
Origin: Iliac crest, spine, ribs 7-12
Insertion: floor or bicipital groove of humerus
latissimus dorsi
Action: flexes and supinates the forearm
Origin: coracoid process of the scapula and supraglenoid tubercle
Insertion: radial tuberosity
biceps brachii
Action: extends the forearm
Origin: scapula and posterior
Insertion: olecranon process of the ulna
triceps brachii
Action: supinates the forearm
Origin: distal humerus
Insertion: styloid process of the radius
brachioradialis
Action: flexes the forearm at the elbow
Origin: distal anterior surface of the humerus
Insertion: coronoid process of the ulna
brachialis
Action: stabilizes the hips
Origin: middle portion of the ileum
Insertion: oblique ridge of the femur
gluteus maximus
Action: dorsiflexes and inverts the foot
Origin: proximal and lateral tibia
Insertion: first cuneiform and first metatarsal
tibialis anterior
Action: plantar flexes the foot
Origin: medial and lateral condyles of the femur
Insertion: calcaneus
gastrocnemius
