Posterior Axio-Appendicular (Extrinsic) Muscles

Question 1

Latissimus Dorsi (swimmers muscle)

Answer 1

Proximal: thoracolumbar fascia, iliac crest, spinous process of T6-T12, ribs, & inferior angle of scapula
Distal: medial lip of intertubercular sulcus
Innervation: thoracodorsal nerve/middle subscap nerve (C6-C8)
Blood supply: subscapular artery
Functions: IR, ADD, & EXT of GH joint

Question 2

Trapezius

Answer 2

Proximal: occipital protuberance, nuchal ligament, & spinous process of C7-T12
Distal: lateral 1/3 of clavicle, acromial process, & spine of scapula
Innervation: spinal accessory nerve (CN XI)
Blood supply: superficial transverse cervical artery
Functions: elevation & rotation of scapula

Question 3

Levator Scapulae

Answer 3

Proximal: transverse processes C1-C4
Distal: superior angle of scapula (twisted)
Innervation: dorsal scapular nerve (C4-C5)
Blood supply: dorsal scapular artery
Functions: elevation & downward rotation of scapula

Question 4

Rhomboid Major

Answer 4

Proximal: spinous processes T2-T5
Distal: medial border of scapula
Innervation: dorsal scapular nerve (C4-C5)
Blood supply: dorsal scapular artery
Functions: ADD & downward rotation of scapula

Question 5

Rhomboid Minor

Answer 5

Proximal: spinous process C7-T1
Distal: superior angle of the scapula
Innervation: dorsal scapular nerve (C4-C5)
Blood supply: dorsal scapular artery
Functions: ADD & downward rotation of scapula