upper limb muscles

Question 1

Deltoid

Answer 1

Origin: AF - anterior lateral 1/3 of the clavicle
MF- acromion
process
PF- posterior
acromion

insertion: deltoid
tuberosity

Action: AF - flexion +
medially rotates
MF- abduction
PF- extension +
medially rotates

Question 2

Teres minor

Answer 2

origin: lateral border of the scapula

Insertion: greater tubercle of humerus

action: external rotationI

Question 3

Infraspinatous

Answer 3

Origin: infraspinous fossa of posterior surface of scapula

Insertion: greater tubercle of humerus

Action: lateral rotation

Question 4

Supraspinatus

Answer 4

Origin: supraspinous fossa

Insertion: greater tubercle of humerus

action: abduction

Question 5

subscapularis

Answer 5

Origin: subscapular fossa

Insertion: lesser tubercle

Action: internal rotation

Question 6

Trapezius

Answer 6

Origin: occipital bone , spinous process of vertebrae c7 - c12

Insertion: lateral 1/3 clavicle , acromion + spine of scapula

Action: elevates, retracts and depresses the scapula

Question 7

Levator scapula

Answer 7

origin: Transverse process of c1-c4

Insertion: medial border of scapula between superior angle + base of spine

Action: downward rotator of scapula

Question 8

Rhomboid major

Answer 8

origin: spinous process of T2-T5

Insertion: medial border of scapula

Action: retraction of scapula + downward rotatpr

Question 9

Rhomboid minor

Answer 9

origin: spinous process of T C7-T1

Insertion: medial border of scapula

Action: retraction + downward rotation of scapula

Question 10

Pec minor

Answer 10

Origin: ribs 3-5

Insertion: coracoid process

Action: downward rotation of scapula + depression

Question 11

Pec major

Answer 11

origin: medial 1/2 clavicle
sternum
distal sternum ribs
5+6

insertion: lateral lip of intertubercle groove of humerus

Action: adduction + internal rotation

Question 12

serratus anterior

Answer 12

Origin: rib 1-9

Insertion: medial border of scapula

Action: upward rotation

Question 13

Biceps brachii

Answer 13

Origin: LH - supraglenoid
tubercle
SH- coracoid
process

Insertion: radial tuberosity + bicipital groove

Action: Flexion shoulder + flexion elbow

Question 14

Teres major

Answer 14

Origin: inferior angle of scapula

Insertion: intertubercle groove of humerus

Action: internal rotation

Question 15

lat dorsi

Answer 15

origin: spinous process lower 6 thoracic + all lumbar + sacral vertebrae + outer lip of iliac crest + inferior angle of scapula

insertion: intertubercle groove of humerus

Action: Extension, adduction + internal rotation

Question 16

coracobrachialis

Answer 16

Origin: coracoid process

Insertion: medial shaft of humerus

Action: flexion + adduction

Question 17

brachialis

Answer 17

origin: medial of humerus

insertion: coranoid process + tuberosity of ulnar

Action: elbow flexion

Question 18

brachioradialis

Answer 18

origin: lateral supracondylar ridge of humerus

Insertion: radial styloid

Action: elbow flexion (mid prone)

Question 19

Triceps

Answer 19

Origin: LH - infraglenoid tubercle
Medial + lateral head - posterior humerus

insertion: olecranon

Action: elbow extension

Question 20

pronator teres

Answer 20

Origin: Humeral head = medial epicondyle of humerus
Ulnar head - coronoid process

Insertion: lateral surface of radius

Action: pronation

Question 21

Flexor carpi ulnaris

Answer 21

Origin: Medial epicondyle of humerus + olecranon

insertion: pisiform, hook of hamate + base of 5th

action: flexes wrist + ulnar deviates

Question 22

Flexor carpi radialis

Answer 22

Origin: medial epicondyle of humerus

insertion: base of 2nd + 3rd metacarpals

Action: flexes wrist + radial deviation

Question 23

flexor digitorum superficialis

Answer 23

Origin: medial epicondyle of humerus , coronoid process of ulna + anterior border of radius

Insertion: middle phalanges digits 2-5

Action: flexes wrist + MCP flexion

Question 24

flexor pollicis longus

Answer 24

Origin: anterior surface of radius

Insertion: base of distal phalanx

Action: Flexes IP JOINT OF THUMB + ASSISTS WRIST FLEXION

Question 25

flexor digitorum profondus

Answer 25

origin: anterior + medial surfaces of ulna insertion: base of distal phalnges of digits 2-5 action: flexes dip joints

Question 26

Extensor carpi ulnaris

Answer 26

origin: lateral epicondyle of humerus insertion: base of 5th metacarpal Action extend wrist + ulnar deviate

Question 27

extensor carpi radialis longus

Answer 27

origin: lateral supracondylar ridge of humerus insertion: base 2nd metacarpal action: extends wrist + radial deviation

Question 28

extensor carpi radialis brevis

Answer 28

origin: lateral epicondlyar ridge of humerus insertion: base of 3rd metacarpal action: extends wrist + radial deviation

Question 29

extensor digitorum communis

Answer 29

Origin: lateral epicondyle of humerus insertion: extensor expansion digits 2-5 action: extends wrist + finger

Question 30

extensor digiti minimi

Answer 30

origin: lateral epicondyle of humerus insertion: extensor expansion of 5th digit action: extends little finger

Question 31

Extensor indices

Answer 31

Origin; posterior ulna insertion: extensor expansion of 3nd digit action: extends index finger

Question 32

Abductor pollicis longus

Answer 32

origin: posterior surface of ulna + radius # Insertion: base 1st metacarpal action: abducts thumb

Question 33

extensor pollicis brevis

Answer 33

origin: posterior surfacr of radius insertion: base of proximal phalanx of thumb action: extends thumb

Question 34

extensor pollicis longus

Answer 34

origin: posterior surface of ulna insertion: base of distal phalanx of thumb action: extends the thumb