Lab 1 Muscles Of The Back

Question 1

Latissimus Dorsi innervation

Answer 1

Thoracodorsal nerve

Question 2

Deltoid innervation

Answer 2

Axillary nerve

Question 3

Trapezius innervation

Answer 3

Spinal accessory nerve XI

Question 4

Trapezius action

Answer 4

Descending (superior) part elevates. Inferior (ascending) part depresses. Middle part (all together) retract scapula and rotate glenoid superiorly.

Question 5

Levator scapulae action

Answer 5

Elevates scapula

Question 6

Teres minor action and innervation

Answer 6

Axillary nerve. Laterally rotates shoulder

Question 7

Rhomboid action and innervation

Answer 7

Retract scapula, dorsal scapular nerve

Question 8

Erector spinae action and innervation

Answer 8

extends and laterally rotates vertebral column

posterior rami of spinal nerve

Question 9

Supraspinatus innervation and action

Answer 9

Suprascapular nerve

Abduction of shoulder up to 15 degrees, initiates

Question 10

Levator scapulae innervation

Answer 10

Dorsal scapular nerve

Question 11

Subscapularis action and innervation

Answer 11

Medial rotation and adducts

Upper and lower subscapular nerve

Question 12

Infraspinatus innervation and action

Answer 12

Subscapular nerve.

Laterally rotates arm

Question 13

Latissimus Dorsi action

Answer 13

Extends, adducts, and medially rotates arm

Question 14

Deltoid action

Answer 14

Anterior flexes

Middle abducts 15 to 90 degrees

Posterior extends arm

Question 15

Teres major action and innervation

Answer 15

Lower subscapular nerve. Adducts and medially rotates shoulder

Question 16

Serratus anterior action and innervation

Answer 16

Protracts scapula. Rotates it. Long thoracic nerve.