Superficial Back Muscles

Question 0

Latissimus Dorsi

Answer 0

Origin: Spinous processes of T7-12 thoracolumbar facia; iliac crest, and inferior 3 or 4 ribs.

Insertion: Floor of intertubercular sulcus (groove) of humerous

Innervation: Thoracodorsal nerve, segment C6-C8

Question 1

Trapezius

Answer 1

Origin: Medial third of superior nuchal line; external occipital protuberance, nuchal ligament; spinous processes of C7-T12

Insertion: Lateral third of clavicle, acromion, and spine of scapula

Innervation: Spinal accessory nerve (CN XI, motor); segment C3,C4

Question 2

Rhomboid Major

Answer 2

Origin: Spinous processes of T2-T5 vertebrae

Insertion: Medial border of scapula from level of spine to inferior angle

Innervation: Dorsal Scapular Nerve (C4,C5)

Question 3

Rhomboid Minor

Answer 3

Origin: Nuchal ligament, spinous proceses of C7 and T1

Insertion: Triangular area at medial end of scapular spine

Innervation: Dorsal Scapular Nerve (C4,C5)

Question 4

Levator Scapula

Answer 4

Origin: Posterior tubercles of transverse processes of C1-C4

Insertion: Medial boarder of scapula superior to root of spine

Innervation: Dorsal Scapular Nerve (C5), and Cervical Nerve (C3,C4)