Skeletal Muscle Flashcards
sternocleidomastoid
Origin:
manubrium & medial clavicle
Insertion:
mastoid process of temporal
Action:
flexion and rotation of neck
pectoralis major*
Origin:
clavicle, sternum, and costal cartilages
Insertion:
intertubercular sulcus of humerus
Action:
flexes, adducts, and medially rotates shoulder
serratus anterior
Origin:
lateral portion of ribs 1-8
Insertion:
medial border of scapula
Action:
protracts and rotates scapula
deltoid*
Origin:
spine of scapula, acromion, lateral clavicle
Insertion:
deltoid tuberosity of humerus
Action:
abducts shoulder
external intercostals*
+
Origin:
inferior border of rib above
Insertion:
superior border of rib below
Action:
elevate rib cage during inspiration
internal intercostals*
+
Origin:
superior border of rib below
Insertion:
inferior border of rib above
Action:
depress rib cage during forced expiration
rectus abdominus*
Origin:
pubic crest and symphysis
Insertion:
xiphoid process, cartilage of ribs 5-7
Action:
flexes and rotates vertebral column
external oblique*
Origin:
anterior surface of lower 8 ribs
Insertion:
linea alba, pubic crest, iliac crest
Action:
flexion and lateral rotation of trunk
trapezius*
Origin:
occipital bone, cervical & thoracic vertebrae
Insertion:
spine & acromion of scapula, acromion
Action:
elevates, rotates, and retracts scapula
latissimus dorsi*
Origin:
iliac crest; lumbar vertebrae
Insertion:
intertubercular sulcus of humerus
Action:
extends, adducts, medially rotates shoulder
infraspinatus
Origin:
infraspinous fossa of scapula
Insertion:
greater tubercle of humerus
Action:
laterally rotates shoulder
supraspinatus
Origin:
supraspinous fossa of scapula
Insertion:
greater tubercle of humerus
Action:
abducts shoulder
teres major*
Origin:
inferior angle of scapula
Insertion:
Intertubercular sulcus of humerus
Action:
extends, adducts, medially rotates shoulder
rhomboid major*
Origin:
spinous processes of T1-T5
Insertion:
medial border of scapula
Action:
retracts and stabilizes scapula
triceps brachii - long head*
Origin:
inferior edge of glenoid cavity of scapula
Insertion:
olecranon process of ulna
Action:
forearm extension
triceps brachii - lateral head*
Origin:
posterior proximal humerus
Insertion:
olecranon process of ulna
Action:
forearm extension
biceps brachii - long head*
Origin:
superior edge of glenoid cavity of scapula
Insertion:
radial tuberosity
Action:
forearm flexion and supination
biceps brachii - short head*
Origin:
coracoid process of scapula
Insertion:
radial tuberosity
Action:
forearm flexion and supination
brachioradialis*
Origin:
lateral distal humerus
Insertion:
styloid process of radius
Action:
forearm flexion
brachialis*
Origin:
anterior distal humerus
Insertion:
coronoid process of ulna
Action:
forearm flexion
pronator teres*
Origin:
medial epicondyle of humerus
Insertion:
middle of radius
Action:
forearm pronation
flexor carpi radialis*
Origin:
medial epicondyle of humerus
Insertion:
metacarpals II and III
Action:
flexes and abducts wrist
palmaris longus*
Origin:
medial epicondyle of humerus
Insertion:
palmar aponeurosis
Action:
flexes wrist
flexor carpi ulnaris*
Origin:
medial epicondyle of humerus
Insertion:
metacarpal V
Action:
flexes and adducts wrist
flexor digitorum superficialis*
Origin:
medial epicondyle of humerus
Insertion:
phalanges of digits 2-5
Action:
flexes fingers
extensor carpi radialis longus*
Origin:
lateral epicondyle of humerus
Insertion:
metacarpal II
Action:
extends and abducts wrist
extensor carpi radialis brevis*
Origin:
lateral epicondyle of humerus
Insertion:
metacarpal III
Action:
extends and abducts wrist
extensor digitorum*
Origin:
lateral epicondyle of humerus
Insertion:
phalanges of digits 2-5
Action:
extends fingers
extensor carpi ulnaris*
Origin:
lateral epicondyle of humerus
Insertion:
metacarpal V
Action:
extends and adducts wrist
sartorius*
Origin:
anterior superior iliac spine
Insertion:
medial proximal tibia
Action:
flexes and laterally rotates hip; flexes knee
pectineus*
Origin:
superior pubic ramus
Insertion:
posterior proximal femur
Action:
hip adduction & flexion
adductor longus*
Origin:
pubic symphysis
Insertion:
linea aspera of femur
Action:
hip adduction & flexion
gracilis*
Origin:
inferior pubic ramus
Insertion:
medial proximal tibia
Action:
hip adduction &flexion
rectus femoris*
Origin:
anterior inferior iliac spine
Insertion:
tibial tuberosity
Action:
hip flexion, knee extension
vastus lateralis*
Origin:
greater trochanter of femur
Insertion:
tibial tuberosity
Action:
knee extension
vastus medialis*
Origin:
intertrochanteric line of femur
Insertion:
tibial tuberosity
Action:
knee extension
vastus intermedius*
Origin:
anterior proximal femur
Insertion:
tibial tuberosity
Action:
knee extension
tensor fascia lata*
Origin:
anterior iliac crest
Insertion:
iliotibial tract/band
Action:
stabilizes knee and pelvis
gluteus maximus*
Origin:
ilium, sacrum, and coccyx
Insertion:
gluteal tuberosity of femur
Action:
hip extension
biceps femoris - long head*
Origin:
ischial tuberosity
Insertion:
head of fibula
Action:
hip extension and knee flexion
biceps femoris - short head*
Origin:
linea aspera of femur
Insertion:
head of fibula
Action:
hip extension and knee flexion
semitendinosus*
Origin:
ischial tuberosity
Insertion:
medial proximal tibia
Action:
hip extension and knee flexion
semimemembranosus*
Origin:
ischial tuberosity
Insertion:
medial proximal tibia
Action:
hip extension and knee flexion
fibularis longus*
Origin:
head of fibula
Insertion:
metatarsal I
Action:
everts and plantarflexes foot
fibularis brevis*
Origin:
lateral distal fibula
Insertion:
metatarsal V
Action:
everts and plantarflexes foot
tibialis anterior*
Origin:
anterior proximal tibia
Insertion:
metatarsal I
Action:
dorsiflexes foot
extensor digitorum longus*
Origin:
lateral condyle of tibia
Insertion:
phalanges of toes 2-5
Action:
extends toes
gastrocnemius - medial head*
Origin:
medial condyle of femur
Insertion:
calcaneus
Action:
plantarflexes foot
gastrocnemius - lateral head*
Origin:
lateral condyle of femur
Insertion:
calcaneus
Action:
plantarflexes foot
soleus*
Origin:
proximal tibia and fibula
Insertion:
calcaneus
Action:
plantarflexes foot
