Upper Extremities I and II: Muscle Locations

Question 1

Trapezius

Answer 1

O: ext. occipital protuberance, sup. nuchal line, nuchal ligament, C7-T12 spinous processes

I: scapula - lateral third of clavicle, acromion, spine

Question 2

Latissimus dorsi

Answer 2

O: thoracolumbar fascia, lower thoracic spinous processes, iliac crest

I: intertubercular sulcus

Question 3

Levator scapula

Answer 3

O: C1-C4 transverse processes

I: scapula - vertebral border superior to spine

Question 4

Rhomboid minor

Answer 4

O: nuchal ligament, C7/T1 spinous processes

I: scapula - triangle area of spine

Question 5

Rhomboid major

Answer 5

O: upper thoracic spinous processes

I: vertebral border of scapula

Question 6

Deltoid

Answer 6

O: scapula - (clavicular) lateral third of clavicle, (acromial) acromion, (spinous) spine

I: deltoid tuberosity

Question 7

Subscapularis

Answer 7

O: subscapular fossa

I: lesser tubercle

Question 8

Supraspinatus

Answer 8

O: supraspinatus fossa

I: greater tubercle

Question 9

Infraspinatus

Answer 9

O: infraspinatus fossa

I: greater tubercle

Question 10

Teres minor

Answer 10

O: axillary border

I: greater tubercle

Question 11

Teres major

Answer 11

O: inferior portion of axillary border

I: medial lip of intertubercular sulcus

Question 12

Triceps brachii

Answer 12

O: (long) infraglenoid tubercle, (lateral) lateral to radial groove, (medial) medial to radial groove

I: olecranon process

Question 13

Brachioradialis

Answer 13

O: lateral supraepicondylar ridge

I: lateral sfc of distal radius

Question 14

Extensor carpi radialis longus

Answer 14

O: lateral supraepicondylar ridge

I: base of metacarpal II

Question 15

Extensor carpi radialis brevis

Answer 15

O: common extensor origin

I: base of metacarpal III

Question 16

Extensor digitorum

Answer 16

O: common extensor origin

I: extensor expansion of digits 2-5

Question 17

Extensor digiti minimi

Answer 17

O: common extensor origin

I: extensor expansion of digit 5

Question 18

Extensor carpi ulnaris

Answer 18

O: common extensor origin

I: base of metacarpal V

Question 19

Supinator

Answer 19

O: lateral epicondyle and prox. ulna lateral sfc

I: lateral sfc. of prox. radius

Question 20

Extensor indices

Answer 20

O: distal ulna posterior and interosseous membrane

I: extensor expansion of digit 2

Question 21

Abductor pollicis longus

Answer 21

O: mid-prox. ulna lateral sfc. and interosseous membrane

I: dorsal aspect of metacarpal I

Question 22

Extensor pollicus brevis

Answer 22

O: distal radius medial sfc. and interosseous membrane

I: dorsal aspect of pollical prox. phalanx

Question 23

Extensor pollicus longus

Answer 23

O: mid-distal ulna lateral sfc and interosseous membrane

I: dorsal aspect of pollical distal phalanx