shoulder AOIN

Question 1

Supraspinatus

Answer 1

A: abduct shoulder, stabilize humerus in glenoid
O: supraspinous fossa
I: superior facet of greater tubercle
N: suprascapular nerve C4,5,6

Question 2

Infraspinatus

Answer 2

A: lateral rotation and adduction of shoulder, stabilization of humerus in glenoid
O: infraspinous fossa
I: middle facet of greater tubercle
N: suprascapular nerve C4,5,6

Question 3

Teres Minor

Answer 3

A: lateral rotation and adduction of shoulder, stabilization of humerus in glenoid
O: upper 2/3 of lateral border of scapula
I: inferior facet of greater tubercle
N: axillary nerve C5,6

Question 4

Subscapularis

Answer 4

A: medial rotation of shoulder, stabilization of humerus in glenoid
O: subscapular fossa
I: lesser tubercle
N: upper and lower subscapular nerve C5,6,7

Question 5

Deltoid

Answer 5

A: all fibers - abduct shoulder
: anterior fibers - flexion, medial rotation, horizontal adduction of the shoulder
: posterior fibers - extension, lateral rotation, horizontal abduction of the shoulder
O: lateral 1/3 of clavicle, acromion and spine of scapula
I: deltoid tuberosity
N: C5,6

Question 6

Teres Major

Answer 6

A: extension, medial rotation of shoulder
O: inferior angle and lower 1/3 of lateral border of scapula
I: crest of lesser tubercle
N: lower subscapular nerve C5,6,7

Question 7

Trapezius

Answer 7

A: upper fibers - bilaterally: extend head and neck - unilaterally: laterally flex, rotate head and neck, elevate and upwardly rotate scapula
: middle fibers - adduct and stabilize scapula
: lower fibers - depress and upwardly rotate scapula
O: external occipital protuberance, medial superior nuchal line, ligaments and spinous processes of C7-T12
I: lateral 1/3 of clavicle, acromion and spine of scapula
N: spinal portion of accessory nerve and ventral ramus C2,3,4

Question 8

Latissimus Dorsi

Answer 8

A: extend, adduct, medially rotate shoulder
O: inferior angle, spinous processes of last 3-4 ribs, posterior iliac crest
I: intertubercular groove of humerus
N: thoracodorsal nerve C6,7,8

Question 9

Levator Scapula

Answer 9

A: unilateral - elevate scapula, downwardly rotate, laterally flex and rotate head and neck
: bilateral - extend head and neck
O: transverse processes of 1st-4th cervical vertebra
I: medial border, between superior angle and superior spine of scapula
N: cervical 3 and 4, dorsal scapular nerve C4,5

Question 10

Rhomboid Major

Answer 10

A: adduction, elevation and downward rotation of scapula
O: spinous process of T2-T5
I: medial border between spine and inferior angle
N: dorsal scapular C4,5

Question 11

Rhomboid Minor

Answer 11

A: adduction, elevation and downward rotation of scapula
O: spinous process of C7-T1
I: upper medial border across from spine of scapula
N: dorsal scapular C4,5

Question 12

Pectoralis Major

Answer 12

A: all fibers - adduction and medial rotation of shoulder, elevation of thorax
: upper fibers - flexion and horizontal adduction of shoulder
: lower fibers - extend shoulder
O: medial half of clavicle, sternum, and cartilage of 1-6 ribs
I: crest of greater tubercle of humerus
N: upper - lateral pectoral nerve C5,6,7
: lower - lateral and medial pectoral nerve C6,7,8,T1

Question 13

Pectoralis Minor

Answer 13

A: depress, abduct and downwardly rotate scapula. with scapula fixed elevate thorax
O: 3,4,5 ribs
I: medial surface of coracoid process
N: medial pectoral nerve from branch of the lateral pectoral nerve C6,7,8,T1

Question 14

Serratus Anterior

Answer 14

A: with origin fixed abduct, upwardly rotate and depress scapula. with scapula fixed elevate thorax.
O: external surface of upper 8 ribs
I: anterior surface of medial border of scapula
N: long thoracic nerve C5,6,7,8

Question 15

Subclavius

Answer 15

A: depress clavicle, elevate 1st rib, stabilize SC joint
O: 1st rib and cartilage
I: inferior surface of middle 1/3 of clavicle
N: subclavian C5,6