Extrinsic UE muscles

Question 1

Rhomboid Major

Answer 1

PA: SP T2-5

DA: posterior medial border of scapula inferior to roo

N: dorsal scapular (c4-5)

A: retract, downward rotate and fix scapula to thoracic wall

Question 2

Rhomboid minor

Answer 2

PA: SP c7-T1, inferior end of nuchal ligament

DA: medial border btwn base of spine and superior angle

N: dorsal scapular (c4-5)

A: retract, downward rotate and fix scapula to thoracic wall

Question 3

Levator Scapula

Answer 3

PA: TP c1-4

DA: superior angle of scapula

N: dorsal scapular c4-5

A: elevates and downward rotates scapula

Question 4

Serratus Anterior

Answer 4

PA: lateral part of ribs 1-8 (9?)

DA: anterior surface of medial border of scapula

N: long thoracic nerve c5-7

A: protracts, upward rotates and stabilizes scap

Question 5

Trapezius upper fibers

Answer 5

PA: medial superior nuchal line, ligamentum nuchae

DA: lateral third clavicle

N: spinal accessory nerve (XI)
Sensory: c3-4

A: elevate scapula, UR scapula

Question 6

Trapezius middle fibers

Answer 6

PA: ligamentum nuchae and upper T SP’s

DA: acromion and lateral spine of scapula

N: spinal accessory nerve XI
sensory c3-4

A: retracts scapula

Question 7

Trapezius lower fibers

Answer 7

PA: lower thoracic SP’s

DA: spine of scapula

N: spinal accessory nerve XI
sensory 3-4

A: depress and UR

Question 8

Teres major

Answer 8

PA: inferior angle and lower lateral border of scapula

DA: medial lip of inter tubercular groove on humerus

N: lower scapular nerve c5-6

A: adduct and medially rotate arm, assists in extension

Question 9

Latissimus Dorsi

Answer 9

PA: SP t7-sacrum, posterior iliac crest, lower 3-4 ribs, thoracolumbar fascia

DA: floor on inter tubercular groove

A: extends, adducts, medially rotates humerus

N: thoracodorsal nerve c6-8

Question 10

Anterior Deltoid

Answer 10

PA: lateral third of clavicular

DA: deltoid tuberosity of humerus

A: flexes, IR and horizontal adduction

N: axillary nerve c5-6

Question 11

Middle Deltoid

Answer 11

PA: acromion

DA: deltoid tuberosity of humerus

A: abduct arm

N: axillary c5-6

Question 12

Posterior deltoid

Answer 12

PA: spine of scapula

DA: deltoid tube on humerus

A: extends, ER and horizontal abduct

N: axillary c5-6

Question 13

Pectoralis major: clavicular head

Answer 13

PA: medial half clavicular

DA: lateral lip of inter tubercular groove

A: medial rotation of humerus, horizontal ADD, flexion of arm to horizontal

N: lateral and medial pectoral nerve c5-t1
clavicular head c5-6

Question 14

Pectoralis Major- sternal head

Answer 14

PA: manubrium and body of sternum and costal cartilages of ribs 1-6

DA: lateral lip of inter tubercular groove

A: medial rotation, horizontal ADD, ext of arm in flexed position

N: lateral and medial pectoral nerve c5-t1
sternal head c7-t1

Question 15

Pectoralis Minor

Answer 15

PA: ribs 3-5 near costal cartilage

DA: coracoid process of scapula

A: stabilize scapula, depress scapula, weak protractor

N: medial pectoral c8-t1