DPT ~ Superficial Back Muscles AIONS

Trapezius origin

Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous process of C7-T12 vertebrae

Trapezius insertion

Lateral third of clavicle; acromion and spine of scapula

Trapezius action

Descending part elevates; ascending part depresses; middle part (or all parts together) retracts scapula ; descending and ascending parts act together to rotate glenoid cavity superiorly.

Trapezius innervation

Spinal accessory nerve (CN XI) (motor fibers)

And

- C3,C4 (pain and proprioceptive fibers)

Latissimus Dorsi origin

Spinous process of T7 T12 directly, and spinous process of L1-L5 through thoracolumbar fascia, iliac crest, inferior 3-4 ribs

Latissimus Dorsi insertion

Floor of intertubercular sulcus of humerus

Latissimus Dorsi action

Extends, adducts and internally rotates humerus; raises body towards arms climbing

Latissimus Dorsi innervation

Thoracodorsal nerve (C6, C7, C8)

Levator Scapulae origin

Posterior tubercle of transverse process of C1-C4 vertebrae.

Levator Scapulae insertion

Medial border and Superior angle of scapula

Levator Scapulae action

Elevates scapula and rotates its glenoid cavity inferiorly by rotating scapula

Levator Scapulae innervation

Dorsal scapular (C4,C5) and cervical nerve (C3,C4)

Rhomboid Major origin

Spinous process of T2-T5

Rhomboid Major insertion

Medial border of scapula inferior to the spine of the scapula

Rhomboid Major action

Retracts scapula and rotates its glenoid cavity inferiorly; fixes scapula to thoracic wall.

Rhomboid Major innervation

Dorsal Scapular Nerve (C4,C5)

Rhomboid Minor origin

Nuchal ligaments; spinous process of C7 and T1 vertabrae

Rhomboid Minor insertion

Medial border of the scapula at the level of the spine of the scapula

Rhomboid Minor action

Retracts scapula and rotates its glenoid cavity inferiorly; fix scapula to thoracic wall.

Rhomboid Minor innervation

Dorsal Scapular nerve (C4,C5)