Skeletal Muscle Flashcards by B King

sternocleidomastoid

Origin:
manubrium & medial clavicle

Insertion:
mastoid process of temporal

Action:
flexion and rotation of neck

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pectoralis major*

Origin:
clavicle, sternum, and costal cartilages

Insertion:
intertubercular sulcus of humerus

Action:
flexes, adducts, and medially rotates shoulder

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serratus anterior

Origin:
lateral portion of ribs 1-8

Insertion:
medial border of scapula

Action:
protracts and rotates scapula

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deltoid*

Origin:
spine of scapula, acromion, lateral clavicle

Insertion:
deltoid tuberosity of humerus

Action:
abducts shoulder

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external intercostals*

Origin:
inferior border of rib above

Insertion:
superior border of rib below

Action:
elevate rib cage during inspiration

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internal intercostals*

Origin:
superior border of rib below

Insertion:
inferior border of rib above

Action:
depress rib cage during forced expiration

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rectus abdominus*

Origin:
pubic crest and symphysis

Insertion:
xiphoid process, cartilage of ribs 5-7

Action:
flexes and rotates vertebral column

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external oblique*

Origin:
anterior surface of lower 8 ribs

Insertion:
linea alba, pubic crest, iliac crest

Action:
flexion and lateral rotation of trunk

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trapezius*

Origin:
occipital bone, cervical & thoracic vertebrae

Insertion:
spine & acromion of scapula, acromion

Action:
elevates, rotates, and retracts scapula

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latissimus dorsi*

Origin:
iliac crest; lumbar vertebrae

Insertion:
intertubercular sulcus of humerus

Action:
extends, adducts, medially rotates shoulder

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infraspinatus

Origin:
infraspinous fossa of scapula

Insertion:
greater tubercle of humerus

Action:
laterally rotates shoulder

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supraspinatus

Origin:
supraspinous fossa of scapula

Insertion:
greater tubercle of humerus

Action:
abducts shoulder

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teres major*

Origin:
inferior angle of scapula

Insertion:
Intertubercular sulcus of humerus

Action:
extends, adducts, medially rotates shoulder

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rhomboid major*

Origin:
spinous processes of T1-T5

Insertion:
medial border of scapula

Action:
retracts and stabilizes scapula

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triceps brachii - long head*

Origin:
inferior edge of glenoid cavity of scapula

Insertion:
olecranon process of ulna

Action:
forearm extension

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triceps brachii - lateral head*

Origin:
posterior proximal humerus

Insertion:
olecranon process of ulna

Action:
forearm extension

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biceps brachii - long head*

Origin:
superior edge of glenoid cavity of scapula

Insertion:
radial tuberosity

Action:
forearm flexion and supination

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biceps brachii - short head*

Origin:
coracoid process of scapula

Insertion:
radial tuberosity

Action:
forearm flexion and supination

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brachioradialis*

Origin:
lateral distal humerus

Insertion:
styloid process of radius

Action:
forearm flexion

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brachialis*

Origin:
anterior distal humerus

Insertion:
coronoid process of ulna

Action:
forearm flexion

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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