ANATOMY: SUPERFICIAL MUSCLES OF THE BACK

origin, insertion, actions, innervation, blood supply

What is the trapezius origin?

external occipital protuberance

superior nuchal line

nuchal ligament

spinous process C7 and T1-T12

What is the trapezius insertion?

superior aspect of spine of scapula

medial aspect of acromion process

lateral 1/3 of clavicle, posterior superior aspect

What is the trapezius nerve innervation?

spinal accessory nerve

(arises from CN XI)

What is the trapezius blood supply?

superficial branch of the transverse cervical artery

(arises from subclavian artery and crosses posterior cervical triangle to deep surface of trapezius)

What is the trapezius action?

upper trap: elevation of distal clavicle and scapula with cervical extension

middle trap: ADD and upward rotation of scapula

lower trap: ADD and depression of scapula

What is the latissimus dorsi origin?

spinous processes of T7-T12 and all lumbae spines

thoracolumbal fascia

iliac crest

lower 3 ribs

What is the latissimus dorsi insertion?

floor of intertubercle groove of humerus

What is the latissimus dorsi nerve innervation?

thoracodorsal nerve (arises from posterior cord of brachial plexus)

What is the latissimus dorsi blood supply?

thoracodorsal artery (branch from subscapular artery from 3rd part of axillary artery)

What is the latissimus dorsi action?

EXT and ADD of upper extremity

What is the rhomboid major origin?

spinous processes T2-T5

What is the rhomboid major insertion?

medial border of scapula

What is the rhomboid major nerve innervation?

dorsal scapular nerve

What is the rhomboid major blood supply?

dorsal scapular artery

What is the rhomboid major action?

adducts, rotates, and elevates scapula

What is the rhomboid minor origin?

nuchal ligament

prinous process C7 and T1

What is the rhomboid minor insertion?

medial border of scapula

What is the rhomboid minor nerve innervation?

dorsal scapulae nerve

What is the rhomboid minor blood supply?

dorsal scapular artery

What is the rhomboid minor action?

adducts, rotates, and elevates the scapula

What is the levator scapulae origin?

transverse process of C1-C4

What is the levator scapulae insertion?

superior angle of the scapula

What is the levator scapulae nerve innervation?

dorsal scapulae artery

What is the levator scapulae blood supply?

dorsal scapular artery

What is the levator scapulae action?

elevates and rotates the scapula