Superficial Back Muscles

Question 1

Attachments, actions & innervation of Latissimus Dorsi

Answer 1

Attach: Lower thoracic spinous processes, thoracolumbar fascia, iliac crest to the intertubercular sulcus of humerus
Action: adduction, extension, internal/medial rotation of humerus
Innervation: thoracodorsal nerve

Question 2

Attachments, actions & innervation of Levator Scapulae

Answer 2

Attach: transverse processes of C1-4 to superior angle and superomedial border of scapula
Action: elevation, downward rotation of scapula
Innervation: dorsal scapular nerve (sensory: direct branches of C3-4)

Question 3

Attachments, actions & innervation of Rhomboids

Answer 3

Attach: spinous processes of C7-T2 to medial border of scapula
Action: retraction, elevation, downward rotation of scapula
Innervation: dorsal scapular nerve (sensory: direct branches of C3-4)

Question 4

Attachments, actions & innervations of Trapezius

Answer 4

Attach: superior nuchal line, external occipital protuberance, ligamentum nuchae, cervical and thoracic spinous processes to clavicle, acromion process, and scapular spine
Action: scapular elevation (upper), depression (lower), retraction (transverse), upward rotation (upper and lower)
Innervation: accessory nerve (CN XI -motor) and C3-4 (sensory)