Muscles Superficial back

Question 1

Supraspinatus Origin

Answer 1

Supraspinous fossa of scapula

Question 2

Supraspinatus Insertion

Answer 2

greater tubercle of humerus

Question 3

Supraspinatus Innervation

Answer 3

Suprascapular nerve

Question 4

Supraspinatus Action

Answer 4

1) Initiates and assists deltoid in abduction of arm

2) Acts with rotator cuff muscles (RCM)

Question 5

Supraspinatus Blood Supply

Answer 5

Suprascapular artery

Question 6

Infraspinatus Origin

Answer 6

Infraspinous fossa of scapula

Question 7

Infraspinatus Insertion

Answer 7

greater tubercle of humerus

Question 8

Infraspinatus Innervation

Answer 8

Suprascapular nerve

Question 9

Infraspinatus Action

Answer 9

1) Laterally rotates arm

2) Acts with RCM

Question 10

Infraspinatus Blood Supply

Answer 10

Suprascapular artery

Question 11

Teres Major Origin

Answer 11

Inferior angle of scapula

Question 12

Teres Major Insertion

Answer 12

Intertubercular groove

Question 13

Teres Major Innervation

Answer 13

Lower subscapular nerve

Question 14

Teres Major Action

Answer 14

1) Adducts arm
2) medially rotates arm
* **NOT RCM

Question 15

Teres Major Blood Supply

Answer 15

Subscapular and circumflex scapular arteries

Question 16

Teres Minor Origin

Answer 16

Lateral border of scapula

Question 17

Teres Minor Insertion

Answer 17

greater tubercle on humerus

Question 18

Teres Minor Innervation

Answer 18

Axillary nerve

Question 19

Teres Minor Action

Answer 19

1) Laterally rotate arm

2) acts as RCM

Question 20

Teres Minor Blood Supply

Answer 20

Subscapular and circumflex scapular arteries

Question 21

Subscapularis Origin

Answer 21

Subscapular fossa (anterior most part of scapula directly against ribs)

Question 22

Subscapularis Insertion

Answer 22

Lesser tubercle of humerus

Question 23

Subscapularis Innervation

Answer 23

Upper and lower subscapular nerves

Question 24

Subscapularis Action

Answer 24

1) medially rotates arm

2) acts as RCM

Question 25

Subscapularis Blood Supply

Answer 25

Subscapular artery

Question 26

Trapezius Origin

Answer 26

1) Nuchal line 2) Nuchal ligament 3) exterior occiptal protuberance 4) T7-T12 spinous processes

Question 27

Trapezius Insertion

Answer 27

1) spine of scapula 2) acromion 3) lateral 3rd of clavicle

Question 28

Trapezius Innervation

Answer 28

Cranial Nerve 11 (spinal accessory nerve)

Question 29

Trapezius Action

Answer 29

1) Ascending fibers: Depress scapula (lower shoulder) 2) Middle fibers: Retract scapula (pull it posteriorly) 3) Descending fibers: elevate scapula 4) Rotates scapula superiorly (with serratus anterior) * *Descending and ascending act together to rotate glenoid cavity superiorly

Question 30

Trapezius Blood Supply

Answer 30

transverse cervical artery

Question 31

Latissimus Dorsi Origin

Answer 31

T6 to thoracolumbar fascia, attaches to sacrum and illiac crest

Question 32

Latissimus Dorsi Insert

Answer 32

Intertuburcular groove of humerus

Question 33

Latissimus Dorsi Innervation

Answer 33

Thoracodorsal nerve

Question 34

Latissimus Dorsi Action

Answer 34

1) Extends arm 2) Medially rotate arm/humerus 3) Propel body upwards while climbing 4) Adducts arm (with trapezius)

Question 35

Latissimus Dorsi Blood Supply

Answer 35

Thoracodorsal artery

Question 36

Rhomboid Major and Rhomboid Minor Origin

Answer 36

Major: spinous processes of T2-T5 Minor: spinous processes of C7 and T1 vertebrae (and Nuchal ligament)

Question 37

Rhomboid Major and Rhomboid Minor Insertion

Answer 37

Medial border of scapula

Question 38

Rhomboid Major and Rhomboid Minor Innervation

Answer 38

Dorsal scapular nerve

Question 39

Rhomboid Major and Rhomboid Minor Action

Answer 39

1) Retract scapula 2) rotate glenoid cavity inferiorly 3) Fix scapula to the thoracic wall

Question 40

Rhomboid Major and Rhomboid Minor Blood Supply

Answer 40

Dorsal scapular artery

Question 41

Levator Scapulae Origin

Answer 41

Transverse processes of C1-C4

Question 42

Levator Scapulae Insertion

Answer 42

Medial border of scapula to superior angle

Question 43

Levator Scapulae Innervation

Answer 43

Dorsal scapular nerve

Question 44

Levator Scapulae Action

Answer 44

1) Elevates scapula (assist trapezius) | 2) Rotates glenoid cavity inferiorly

Question 45

Levator Scapulae Blood Supply

Answer 45

Dorsal scapular artery