Texas A&M Biol 319 AOI Lab 5(1)

pectoralis major (action)

Action: -Arm flexion

-Rotates arm medially

-Adducts arm

pectoralis major (origin)

Origin: -sternal end of clavicle

-sternum

-cartilage of ribs 1-6

pectoralis major (insertion)

Insertion:

Intertubercular sulcus and greater tubercle of humerus

latissimus dorsi (action)

Action: -arm extension

-adducts arms

-medially rotates arm at shoulder

latissimus dorsi (origin)

Origin: -Spines of T7-L5; ribs 9-12; iliac crest

latissimus dorsi (Insertion)

Insertion: -intertubercular sulcus of humerus

deltoid (action)

Action: -arm abduction

-flexion and medial rotation of humerus

-extension and lateral rotation of arm

deltoid (origin)

Origin: -lateral 3rd of clavicle

-acromion and spine of scapula

deltoid (Insertion)

Insertion: -deltoid tuberosity of humerus

trapezius (action)

Action: -stabilizes, raises, retracts and rotates scapula

trapezius (origin)

Origin: -occipital bone

-spinous process of c7 and all thoracic vertebrae

trapezius (insertion)

Insertion: -Acromion and spine of scapula

-lateral 3rd of clavicle

pectoralis minor (action)

Action: -draws scapula forward and downward

pectoralis minor (origin)

Origin: -anterior surfaces of ribs 3-5

pectoralis minor (Insertion)

Insertion: -coracoid process of scapula

external oblique (action)

Action: -flexes vertebral column

-compress abdominal wall

-rotating trunk and flexing laterally

external oblique (origin)

Origin: -outer surface of ribs 5-12

external oblique (insertion)

Insertion: -linea alba

-pubic crest

-iliac crest

brachioradialis (action)

Action: -forearm flexion

-stabilizes the elbow during rapid flexion and extension

brachioradialis (origin)

Origin: -lateral supracondylar ridge at distal end of humerus

brachioradialis (insertion)

Insertion: -styloid process of radius

pronator teres (action)

Action: -pronates forearm

-weak flexor of elbow

pronator teres (origin)

Origin: -medial epicondyle of humerus

-coronoid process of ulna

pronator teres (insertion)

Insertion: -lateral radius

flexor carpi radialis (action)

Action: -powerful flexor of wrist

-abducts hand

flexor carpi radialis (insertion)

Insertion: -base of 2nd and 3rd metacarpals

palmaris longus (action)

Action: -tenses skin and fascia of palm during hand movements

palmaris longus (insertion)

Insertion: -palmar aponeurosis

flexor carpi ulnaris (action)

Action: -wrist flexor

-adducts hand

flexor carpi ulnaris (origin)

Origin: -medial epicondyle of humerus

-olecranon process and posterior surface of ulna

flexor carpi ulnaris (insertion)

Insertion: -pisiform; hamate ; 5th metacarpal

extensor carpi radialis longus (origin)

Origin: -lateral supracondylar ridge of humerus

extensor carpi radialis longus (insertion)

Insertion: -base of 2nd metacarpal

extensor carpi radialis brevis (insertion)

Insertion: -base of 3rd metacarpal

extensor digitorum (action)

Action: -extension of fingers

extensor digitorum (insertion)

Insertion: -distal phalanges of fingers 2-5

(extensor)

extensor carpi ulnaris (origin)

Origin: -lateral epicondyle of humerus

-posterior border of ulna

extensor carpi ulnaris (insertion)

Insertion: -base of 5th metacarpal

flexor pollicis longus (action)

Action: -flexes distal phalanx of thumb

flexor pollicis longus (origin)

Origin: -anterior surface of radius

flexor pollicis longus (insertion)

Insertion: -distal phalanx of thumb

flexor digitorum profundus (action)

Action: -flexes distal interphalangeal joints

-wrist flexion

flexor digitorum profundus (origin)

Origin: -coronoid process

-anteromedial surface of ulna

flexor digitorum profundus (insertion)

Insertion: -distal phalanges of fingers 2-5

(flexor)

abductor pollicis longus (action)

Action: -abducts and extends thumb

abductor pollicis longus (origin)

Origin: -posterior surface of radius and ulna

abductor pollicis longus (insertion)

Insertion: -base of 1st metacarpal

-trapezium

extensor pollicis longus (action)

Action: -extends thumb

extensor pollicis longus (origin)

Origin: -dorsal shaft of radius and ulna

extensor pollicis longus (insertion)

Insertion: -base of distal phalanx of thumb

supinator (action)

Action: -assists biceps brachii to supinate forearm

supinator (origin)

Origin: -lateral epicondyle of humerus

-proximal ulna

supinator (insertion)

Insertion: -proximal end of radius

abductor pollicis brevis (action)

Action: -abducts thumb

abductor pollicis brevis (origin)

Origin: -flexor retinaculum

(abductor)

abductor pollicis brevis (insertion)

Insertion: -lateral base of thumb's proximal phalanx

flexor pollicis brevis (action)

Action: -flexes thumb

flexor pollicis brevis (origin)

Origin: -flexor retinaculum

(flexor)

flexor pollicis brevis (insertion)

Insertion: -lateral side of base of proximal phalanx of thumb

opponens pollicis (action)

Action: -opposition of thumb

opponens pollicis (origin)

Origin: -flexor retinaculum

-trapezium

opponens pollicis (insertion)

Insertion: -anterior side of 1st metacarpal

adductor pollicis (action)

Action: -adducts and helps to oppose thumb

adductor pollicis (origin)

Origin: -capitate and base of metacarpals 2-4

adductor pollicis (insertion)

Insertion: -medial side of base of proximal phalanx of thumb

opponens digiti minimi (action)

Action: -opposition of the 5th metacarpal

opponens digiti minimi (origin)

Origin: hamate

-flexor retinaculum

opponens digiti minimi (insertion)

Insertion: Medial side of 5th metacarpel