Posterior Axio-Appendicular Muscles

Question 1

Trapezius - Origin

Answer 1

Medial third of superior nuchal line
External occipital protuberance
Nuchal ligament
Spinous processes of C7-T12 vertebrae

Question 2

Trapezius - Insertion

Answer 2

Lateral third of clavicle

Acromion and spine of the scapula

Question 3

Trapezius - Innervation

Answer 3

Spinal accessory nerve (CN XI; motor fibers)

C3 & C4 spinal nerves (pain and proprioception)

Question 4

Trapezius - Action(s)

Answer 4

Descending (superior) part – elevates scapula
Ascending (inferior) part – depresses scapula
Middle part – retracts scapula
Superior and Inferior parts together rotate glenoid cavity superiorly

Question 5

Latissimus Dorsi - Origin

Answer 5

Spinous processes of inferior six thoracic vertebrae (T7-T12)
Thoracolumbar fascia
Iliac crest
Inferior three or four ribs

Question 6

Latissimus Dorsi - Insertion

Answer 6

Floor of the intertubercular sulcus (groove) of humerus

Question 7

Latissimus Dorsi - Innervation

Answer 7

Thoracodorsal nerve (C6, C7, C8)

Question 8

Latissimus Dorsi - Action(s)

Answer 8

Extends, adducts, and medially rotates shoulder joint

Raises body toward arms during climbing

Question 9

Levator Scapulae - Origin

Answer 9

Posterior tubercles of transverse processes of C1-C4 vertebrae

Question 10

Levator Scapulae - Insertion

Answer 10

Medial border of scapula superior to the root of the spine

Question 11

Levator Scapulae - Innervation

Answer 11

Dorsal Scapular nerve (C5)

Cervical spinal nerves (C3,C4)

Question 12

Levator Scapulae - Action

Answer 12

Elevates scapula and rotates glenoid cavity inferiorly

Question 13

Rhomboid Minor - Origin

Rhomboid Major

Answer 13

Minor: nuchal ligament
Spinous processes of C7 and T1 vertebrae

Major: spinous processes of T2-T5 vertebrae

Question 14

Rhomboid Minor - Insertion

Rhomboid Major

Answer 14

Minor: triangular area at medial end of scapular spine

Major: medial border of scapula from level of spine to inferior angle

Question 15

Rhomboid Minor - Innervation

Rhomboid Major

Answer 15

Dorsal Scapular Nerve (C4, C5)

Question 16

Rhomboid Minor - Action(s)

Rhomboid Major

Answer 16

Retracts scapula and rotates glenoid cavity inferiorly

Fix scapula to thoracic wall