Anatomy Superficial Back Muscles (Origin/Insertion, Nerve Innervation, Blood Supply & Action))

Trapezius Origin (4)

1. external occipital protuberance

2. superior nuchal line

3. nuchal ligament

Trapezius Insertion (3)

1. superior aspect of spine of the scapula

2. medial aspect of acromion process

3. lateral 1/3 of clavicle (posterior superior aspect)

Trapezius nerve innervation

spinal accessory nerve

Trapezius blood supply

superficial branch of the transverse cervical artery

Trapezius action (upper (2) , middle (2) & lower (2))

Upper -

1. elevation of distal clavicle scapula

2. cervical extension

Middle -

1. ADD

2. upward rotation of scapula

Lower -

1. ADD

2. depression of scapula

latissimus dorsi origin (4)

1. spinous processes of T7-12 (and all lumbar spines)

2. thoracolumbar fascia

3. iliac crest

4. lower three ribs

latissimus dorsi insertion (1)

1. floor of the intertubercle groove of the humerus

Latissimus dorsi nerve innervation

thoracodorsal nerve

Latissimus dorsi blood supply

thoracodorsal artery

Latissimus dorsi action (2)

1. extension

2. ADD of upper extremity

Rhomboid major origin (1)

1. spinous process of T2-5

Rhomboid major insertion (1)

1. medial border of scapula

Rhomboid major nerve innervation

dorsal scapular nerve

Rhomboid major blood supply

dorsal scapular artery

Rhomboid major action (3)

1. ADD of scapula

2. rotates scapula

3. elevates scapula

Rhomboid minor origin (2)

1. ligamentum nuchae

2. spinous process C7-T1

Rhomboid minor insertion (1)

1. medial border of scapula

Rhomboid minor nerve innervation

dorsal scapular nerve

Rhomboid minor blood supply

dorsal scapular artery

Rhomboid minor action (3)

1. ADD of scapula

2. rotates scapula

3. elevates scapula

Levator scapulae origin (1)

1. transverse processes of C1-C4

Levator scapulae insertion (1)

1. superior angle of the scapula

Levator scapulae nerve innervation

dorsal scapular nerve

Levator scapulae blood supply

dorsal scapular artery

Levator scapulae action (2)

1. elevates scapula

2. rotates the scapula