Back Muscles

Question 1

Actions of Serratus Posterior Inferior

Answer 1

Depresses ribs 9-12

Question 2

Innervation of Latissimus Dorsi

Answer 2

Thoracodorsal nerve.

Question 3

Function of Latissimus Dorsi

Answer 3

Extends, adducts and medially rotates the upper limb.

Question 4

Actions of trapezius

Answer 4

The upper fibres of the trapezius elevates the scapula and rotates it during abduction of the arm. The middle fibres retract the scapula and the lower fibres pull the scapula inferiorly.

Question 5

Innervation of Trapezius

Answer 5

Motor innervation is from the accessory nerve. It also receives proprioceptor fibres from C3 and C4 spinal nerves.

Question 6

Innervation of Serratus Posterior Superior

Answer 6

Intercostal nerves.

Question 7

Action of Levator Scapula

Answer 7

Elevates scapula

Question 8

Actions of Serratus Posterior Superior

Answer 8

Elevates ribs 2-5.

Question 9

Rhomboids actions

Answer 9

Retracts and rotates the scapula.

Question 10

Innervation of Levator Scapula

Answer 10

Dorsal scapular nerve

Question 11

Rhomboids innervation

Answer 11

Dorsal scapular nerve

Question 12

Innervation of Serratus Posterior Inferior

Answer 12

Intercostal nerves.