Superficial Back Muscles

Trapezius Origin

Medial third superior nuchal line

Trapezius Origin

External occupital protuberance

Trapezius Origin

Nuchal ligament

Trapezius Origin

Spinous processes of C7-T12

Trapezius Insertion

Lateral third of clavicle

Trapezius Insertion

Acromion and spine of scapula

Trapezius Innervation

Spinal accessory nerve

Trapezius Innervation

C3 and C4 spinal nerves

Trapezius Actions

Superior - elevates scapula

Inferior - depresses scapula

Middle - retracts scapula

ALL - superiorly rotates scapula

Levator scapulae Origin

Posterior tubercle of transverse processes of C1-C4

Levator scapulae Insertion

Superior part of medial border of scapula

Levator scapulae Innervation

Dorsal scapular C5 and cervical C3-C4 nerves

Levator scapulae Action

Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula

Latissimus dorsi Origin

Spinous processes of T7-T12 vertebrae

Latissimus dorsi Origin

Thoracolumbar fascia

Latissimus dorsi Origin

Iliac crest

Latissimus dorsi Origin

Inferior 3 or 4 ribs

Latissimus dorsi Insertion

Intertubercular sulcus of humerus

Latissimus dorsi Innervation

Thoracodorsal nerve

Latissimus dorsi Action

Extends, adducts, and medially rotates shoulder joint

Latissimus dorsi Action

Elevates body toward arms during climbing

Rhomboid minor Origin

Inferior part of nuchal ligament

Rhomboid minor Origin

Spinous processes of C7 and T1

Rhomboid major Origin

Spinous processes of T2 to T5

Rhomboid minor and major Insertion

Medial border of scapula from level of spine to inferior angle

Rhomboid minor and major Innervation

Dorsal scapular nerve

Rhomboid minor and major Action

Retract scapula and rotate it to depress glenoid cavity

Rhomboid minor and major Action

Fix scapula to thoracic wall