Back Muscles

Question 0

Latissimus dorsi

Answer 0

Subscapular artery. Thoracodorsal nerve C6-C8.

Extends, adducts, and medially rotates humerus.

Question 1

Trapezius

Answer 1

Transverse cervical artery (also acromial branch of supra scapular artery and dorsal branches of posterior intercostals). Motor innervation: CN XI (spinal accessory nerve). Sensory innervation: ventral rami of C3 and C4.

Superior portion elevates scapula
Middle: retracts scapula.
Inferior depresses scapula

Question 2

Levator scapulae

Answer 2

Dorsal scapular artery and nerve. C3- C5. Elevates scapula.

Question 3

Rhomboid major and minor

Answer 3

Dorsal scapular artery. Ventral rami via dorsal scapular nerve. C4, C5.

Adducts and elevates scapula

Question 4

Serratus posterior superior

Answer 4

Posterior Intercostal arteries and dorsal scapular artery. Anterior rami of upper thoracic nerves and intercostal nerves. T2-T5. Elevates ribs 2-5.

Question 5

Serratus posterior inferior

Answer 5

Lumbar arteries (from aorta). Anterior rami of lower thoracic nerves and intercostal nerves. T9-T12.

Depress ribs 9-12, prevents elevation when diaphragm contracts.

Question 6

Splenius cervicis

Answer 6

Blood supply: aorta. Lower cervical nerves. C6-C8.

Head side to side, together elevate head

Question 7

Erector spinae

Answer 7

ILS. Lateral sacral artery. Posterior branch of spinal nerve.

Question 8

Transversospinalis

Answer 8

Dorsal Rami; lateral sacral artery, along with deep cervical arteries, posterior intercostal arteries, lumbar arteries

Semispinalis, multifidus, rotatores