Superficial Back Muscles

Question 0

Trapezius actions.

Answer 0

1) upper elevate scapula
2) middle retract scapula
3) lower pull medial boarder of scapula, orientating the glenoid fossa upward.

Question 1

Trapezius innervated by?

Answer 1

• accessory nerve for motor

- branches of the ventral primary rami of C3 and C4 for sensation

Question 2

Latissimus dorsi innervation.

Answer 2

Thoracodorsal nerve

Question 3

Latissimus dorsi actions.

Answer 3

1) extends arm at glenohumeral joint
2) adducts the arm at the glenohumeral joint
3) medially rotates the arm at the glenohumeral joint

Question 4

Superficial layer of the back?

Answer 4

Trapezius and latissimus dorsi

Question 5

Deep layer of back includes?

Answer 5

Levator scapulae, rhomboid minor, and rhomboid major.

Question 6

Levator scapulae innervated by?

Answer 6

1) dorsal scapular nerve

2) ventral primary rami

Question 7

Levator scapulae actions?

Answer 7

1) pull scapula medially

2) pull scapula upward

Question 8

Rhomboid minor innervated by?

Answer 8

Dorsal scapular nerve

Question 9

Rhomboid minor actions?

Answer 9

1) pull scapula medially

2) pull scapula upward

Question 10

Rhomboid major innervated by?

Answer 10

Dorsal scapular nerve

Question 11

Rhomboid major actions?

Answer 11

1) pull scapula medially

2) pull scapula upward

Question 12

Superficial layer of shoulder?

Answer 12

Deltoid

Question 13

Deep layer of shoulder?

Answer 13

• supraspinatus
• infraspinatus
• subscapularis
• teres minor and major

Question 14

Supraspinatus innervated by?

Answer 14

Suprascapular nerve C5-C6

Question 15

Infraspinatus innervation?

Answer 15

Suprascapular nerve C5-C6

Question 16

Supraspinatus actions?

Answer 16

1) initiates the first 60 degrees of abduction of the arm

2 stabilizes the shoulder joint

Question 17

Infraspinatus actions?

Answer 17

1) laterally rotates the arm

2) stabilizes the shoulder joint

Question 18

Subscapularis innervated by?

Answer 18

1) lower subscapular nerves C5-C6

2) upper subscapular nerves C5

Question 19

Teres minor innervated by ?

Answer 19

Axillary nerve (C5-C6)

Question 20

Teres minor actions?

Answer 20

Lateral rotator

Question 21

Teres major innervation?

Answer 21

Lower subscapular nerve (C5-C6)

Question 22

Teres major actions?

Answer 22

1) medial rotator

2) adduction