Superficial Muscles Of The Back

Question 0

Levator scapulae

Answer 0

O: transverse processes of C1 - C4

I: medial border of scapula

N: dorsal scapular nerve C5; C3-C4

A: elevates scapula; rotates glenoid cavity.

Question 1

Trapezius

Answer 1

O: external occipital protuberance, superior nuchal line, ligamentum nuchal, spines C7-T12

I: spine of scapula, acromion, and lateral third of clavicle.

N: spinal accessory nerve, C3-C4.

Question 2

Rhomboid minor

Answer 2

O: spines of C7-T1

I: root of spine of scapula.

N: dorsal scapular nerve (C5)

A: adducts scapula

Question 3

Rhomboid major

Answer 3

O: spines T2-T5

I: medial border of scapula

N: dorsal scapular nerve (C5)

A: adducts scapula

Question 4

Latissimus dorsi

Answer 4

O: spines of T7-T12, thoradorsal facia, iliac crest, ribs 9-12.

I: floor of bicipital groove of humerus.

N: thoracodorsal nerve.

A: adducts, extends and rotates arm medialy; depresses scapula.

Question 5

Serratus posterior-superior

Answer 5

O: ligamentum nuchae, supraspinal ligament, and spines of C7-T3.

I: upper border of ribs 2-5.

N: intercostal nerve.

A: elevation of ribs.

Question 6

Serrated posterior-inferior

Answer 6

O: supraspinatus ligament and spines of T11-L2.

I: lower border of ribs 9-12.

N: intercostal nerve T9-T12.

A: depresses ribs.