Skeletal Muscles- Origins, Insertions, & Functions Flashcards
Temporalis
O-temporal bone
I- coronoid process of mandible
F-raises mandible
Trapezius
O-occipital bone, spines of thoracic vertebrae
I-spine of scapula, clavicle
F-raises and rotates scapula
Sternocleidomastoid
O-manubrium of sternum, and clavicle
I-mastoid of temporal bone
F-head flexion, tilting and rotation
Pectoralis major
O-clavicle,sternum
I-greater tubercle of humerus
F-arm flexion, throwing, pushing, climbing
Digastric
O-lower margin of mandible
I-hyoid bone
F-movement of hyoid bone, opening action of mouth;depress mandible
Deltoid
O-clavicle, acromian and spine of scapula
I-deltoid tuberosity of humerus
F-arm abduction
External intercostals
O-inferior border of rib above
I-superior border of rib below
F-elevate the rib cage in inspiration
Latissimus dorsi
O-T6-L5, iliac crest, ribs and scapula
I-intertubercular groove of humerus
F-arm extension and arm adduction; hammering, swimming, striking a blow
Biceps brachii
O-caracoid process and lip of glenoid facet
I-radial tuberosity
F-flexes elbow joint; supination
Triceps brachii
O-lower glenoid facet of scapula and humerus
I-olecranon process of ulna
F-forearm extension
External oblique
O-lower 8 ribs
I- linea alba and pubic crest
F- compression of abdominal wall and aid in trunk rotation
Internal oblique
O-lumbar fascia, iliac crest
I-linea alba, pubic crest
F-compresses abdomeninal wall, trunk rotation
Rectus abdominis
O-pubic crest abd symphysis
I-xiphoid process
F-increase intra abdominal pressure
Gluteus muscle
O-ilium and sacrum
I-femur
F-thigh extension; climbing stairs and running
Adductor femoris (magnus)
O-ischium and pubis
I-linea aspera of femur adducts and rotates thigh
