Upper Extremity Muscles

Question 1

subclavius muscle origin

Answer 1

junction of rib and 1st costal cartilage

Question 2

subclavius muscle insertion

Answer 2

inferior middle 1/3 of clavicle

Question 3

subclavius muscle function

Answer 3

anchors and depresses scapula

Question 4

subclavius muscle nerve

Answer 4

nerve to subclavius (C5, C6)

Question 5

subclavius muscle artery

Answer 5

clavicular branch of thoracroacromial a.

Question 6

sternocleidomastoid (SCM) origin

Answer 6

sternum

medial 1/3 of clavicle

Question 7

sternocleidomastoid (SCM) insertion

Answer 7

mastoid process

Question 8

SCM function

Answer 8

UNI: rotates head to OPPOSITE side
pulls head laterally and down to SAME side
BIL: flexes neck

Question 9

SCM nerve

Answer 9

spinal accessory C2, C3 (sensory)

Question 10

SCM artery

Answer 10

SCM branch of occipital a.

Question 11

Deltoid origin

Answer 11

lateral 1/3 clavicle

acromion & spine of scapula

Question 12

deltoid insertion

Answer 12

deltoid tuberosity on lateral side of humerus

Question 13

deltoid function

Answer 13

abducts (full, esp. medial head)
flexes and internally rotates (ant fibers)
extends and laterally rotates (post fibers)

Question 14

deltoid nerve

Answer 14

Axillary (C5, 6)

Question 15

deltoid artery

Answer 15

deltoid branch of thoracoacromial a.

Question 16

Teres major origin

Answer 16

posterior surface of inferior angle of scapula

Question 17

teres major insertion

Answer 17

lesser tubercle (medial lip) humerus

Question 18

teres major function

Answer 18

adducts and medially rotates arm

Question 19

teres major nerve

Answer 19

lower scapular nerve (C5, 6)

Question 20

teres major artery

Answer 20

circumflex scapular a.

Question 21

supraspinatus origin

Answer 21

supraspinous fossa of scapula

Question 22

supraspinatus insertion

Answer 22

superior facet of greater tubercle

Question 23

supraspinatus function

Answer 23

initiates ABduction (first 15 degrees) 
stabilize shoulder joint (w/ other rotator cuff muscles)

Question 24

supraspinatus innervation

Answer 24

suprascapular n. (C5, 6)

Question 25

supraspinatus artery

Answer 25

suprascapular a.

Question 26

infraspinatus origin

Answer 26

infraspinous fossa of scapula

Question 27

infraspinatus insertion

Answer 27

middle facet on greater tubercle

Question 28

infraspinatus function

Answer 28

laterally rotates arm

helps keep humeral head in glenoid cavity

Question 29

infraspinatus nerve

Answer 29

suprascapular n. (C5, 6)

Question 30

infraspinatus artery

Answer 30

suprascapular a.

Question 31

teres minor origin

Answer 31

upper 2/3 of lateral border of scapula

Question 32

teres minor insertion

Answer 32

inferior facet of greater tuberlce

Question 33

teres minor function

Answer 33

laterally rotates arm

Question 34

teres minor nerve

Answer 34

Axillary nerve (C5, 6) from posterior cord of brachial plexus

Question 35

teres minor artery

Answer 35

circumflex scapular a.

Question 36

subscapularis origin

Answer 36

subscapular fossa (medial 2/3 of costal surface of scapula)

Question 37

subscapularis insertion

Answer 37

lesser tubercle of the humerus

Question 38

subscapularis function

Answer 38

medial rotation

assist with extension

Question 39

subscapularis nerve

Answer 39

upper and lower subscapular nn. (C5, 6)

Question 40

subscapularis artery

Answer 40

subscapular a.