BIOL 319 Lab 5 AOI's

Action of pectoralis major

flexion of arm, medial rotation of arm, adduction of arm, tension of arm from flexed position

origin of pectoralis major

medial clavicle, sternum, costal cartilages 1-6, aponeurosis of external abdominal oblique muscle

insertion of pectoralis major

intertubercular sulcus (groove) of humerus (pm)

action of latissimus dorsi

adduction of arm, extension of arm, medial rotation of arm

origin of latissimus dorsi

sacral and lumbar spines, iliac crest, thoracolumbar fascia, ribs 9-12, spinous processes of T6-T12, inferior angle of scapula

insertion of latissimus dorsi

intertubercular sulcus (groove) of humerus (ld)

action of deltoid

flexion and medial rotation of the arm, extension and lateral rotation of the arm, abduction of the arm

origin of deltoid

lateral third of clavicle, acromion and spine of scapula

insertion of deltoid

deltoid tuberosity of humerus

action of trapezius

elevation and depression of scapula, adduction of scapula, superior rotation of scapula

origin of trapezius

superior nuchal line of occipital bone, spinous processes of C7-T12

insertion of trapezius

lateral clavicle, acromion and spine of scapula

action of pectoralis minor

stabilization of scapula, abduction of scapula, lateral rotation of scapula

origin of pectoralis minor

ribs 3-5

insertion of pectoralis major

coracoid process of scapula

action of external oblique

rotation and flexion of trunk, compression of abdominal wall and viscera (e)

origin of external oblique

ribs and costal cartilages 5-12

insertion of external oblique

linea alba, iliac crest

action of internal oblique

rotation and flexion of trunk, compression of abdominal wall and viscera (i)

origin of internal oblique

inguinal ligament, iliac crest, thoracolumbar fascia

insertion of internal oblique

linea alba, costal cartilages 7-10

action of transverse abdominis

compression of abdominal wall and viscera

origin of transverse abdominis

iliac crest, inguinal ligament, thoracolumbar fascia, costal cartilages 7-12

insertion of transverse abdominis

pubis, linea alba, xiphoid process of sternum

action of brachioradialis

flexion of forearm, pronation of forearm, supination of forearm

origin of brachioradialis

lateral distal shaft of humerus

insertion of brachioradialis

styloid process of radius

action of pronator teres

pronation of forearm

origin of pronator teres

medial epicondyle of humerus, coronoid process of ulna

insertion of pronator teres

lateral mid-shaft of radius

action of flexor carpi radialis

flexion of wrist, abduction of hand

origin of flexor carpi radialis

medial epicondyle of humerus (fcr)

insertion of flexor carpi radialis

base of metacarpals II and III

action of palmaris longus

weak flexion of wrist, tense palmar aponeurosis

origin of palmaris longus

medial epicondyle of humerus (pl)

insertion of palmaris longus

palmar aponeurosis

action of flexor carpi ulnaris

flexion of wrist, adduction of hand

origin of flexor carpi ulnaris

medial epicondyle of humerus, olecranon of ulna, posterior border of ulna

insertion of flexor carpi ulnaris

pisiform, hamate, base of metacarpal V

action of extensor carpi radialis longus

extension of wrist, abduction of hand (l)

origin of extensor carpi radialis longus

lateral supracondylar ridge of humerus

insertion of extensor carpi radialis longus

base of metacarpal II

action of extensor carpi radialis brevis

extension of wrist, abduction of hand (b)

origin of extensor carpi radialis brevis

lateral epicondyle of humerus (ecrb)

insertion of extensor carpi radialis brevis

base of metacarpal III

action of extensor digitorum

extension of fingers 2-5, extension of wrist

origin of extensor digitorum

lateral epicondyle of humerus (ed)

insertion of extensor digitorum

middle and distal phalanges of fingers 2-5

action of extensor carpi ulnaris

extension of wrist, adduction of hand

origin of extensor carpi ulnaris

lateral epicondyle of humerus, posterior shaft of ulna

insertion of extensor carpi ulnaris

base of metacarpal V

action of flexor pollicis longus

flexion of thumb (l)

origin of flexor pollicis longus

anterior midshaft of radius, interosseous membrane, coronoid process of ulna

insertion of flexor pollicis longus

distal phalanx of thumb (f)

action of flexor digitorum profundus

flexion of fingers 2-5, flexion of wrist, flexion of metacarpophalangeal joints

insertion of flexor digitorum profundus

proximal anterior shaft of ulna, interosseous membrane

insertion of flexor digitorum profundus

distal phalanges of fingers 2-5

action of abductor pollicis longus

abduction of thumb, extension of thumb

origin of abductor pollicis longus

proximal posterior radius, proximal posterior ulna, interosseous membrane

insertion of abductor pollicis longus

base of metacarpal I

action of extensor pollicis longus

extension of thumb

origin of extensor pollicis longus

posterior midshaft of ulna, interosseous membrane

insertion of extensor pollicis longus

distal phalanx of thumb (e)

action of supinator

supination of forearm

origin of supinator

posterior proximal shaft of ulna, lateral epicondyle of humerus

insertion of supinator

lateral proximal shaft of radius

action of abductor pollicis brevis

abduction of thumb

origin of abductor pollicis brevis

scaphoid, trapezium, flexor retinaculum

insertion of abductor pollicis brevis

lateral side of proximal phalanx of thumb (a)

action of flexor pollicis brevis

flexion of thumb (b)

origin of flexor pollicis brevis

trapezium, trapezoid, capitate, flexor retinaculum

insertion of flexor pollicis brevis

lateral side of proximal phalanx of thumb (f)

action of opponens pollicis

opposition of thumb

origin of opponens pollicis

trapezium, flexor retinaculum

insertion of opponens pollicis

shaft of metacarpal I

action of adductor pollicis

adduction of thumb

origin of adductor pollicis

capitate, metacarpal II, metacarpal III

insertion of adductor pollicis

proximal phalanx of thumb

action of opponens digiti minimi

opposition of pinky

origin of opponens digiti minimi

hamate, flexor retinaculum

insertion of opponens digiti minimi

shaft of metacarpal V

action of lumbricals of hand

flexion of fingers at metacarpophalangeal joints, extension of fingers at interphalangeal joints

origin of lumbricals of hand

tendons of flexor digitorum profundus

insertion of lumbricals of hand

proximal phalanges of fingers 2-5 via extensor expansions of fingers 2-5

action of palmar interossei of hand

adduction of fingers 2-5, flexion of fingers 2-5 at metacarpophalangeal joints, extension of fingers 2-5 at interphalangeal joints

origin of palmar interossei of hand

palmar surfaces of metacarpals II-V

insertion of palmar interossei of hand

extensor expansions of fingers 2-5, base of proximal phalanges of fingers 2-5

action of dorsal interossei of hand

abduction of fingers 2-5, flexion of fingers at metacarpophalangeal joints, extension of fingers 2-5 at interphalangeal joints

origin of dorsal interossei of hand

metacarpals I-V each attaching to the adjacent sides of two metacarpals

insertion of dorsal interossei of hand

extenspr expansions of fingers 2-4, bases of proximal phalanges of fingers 2-4

pectoralis major

latissimus dorsi (anterior view)

latissimus dorsi (posterior view)

deltoid (anterior view)

deltoid (posterior view)

trapezius (anterior view)

trapezius (posterior view)

pectoralis minor

external oblique

internal oblique