Introduction
36 + 37
Extrinsic /Superficial layer:
superficial layer
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① Trapezius m.
- N: Accessory nerve (XI) & spinal nerves C3-C4
- B.S: Transverse cervical art.
② Latissimus dorsi
- O:
- → Spinous processes T7 - S5
- → Thoracolumbar fascia
- → iliac spine & iliac crest
- → 10th - 12th ribs
- → inferior angle of scapula
- I: Humerus - crest of lesser tubercle.
- N: Thoracodorsal nerve.
- B.S: Thoracodorsal art.
③ Rhomboid minor
- O: Spinous processes C6-C7
- I: Scapula
- N: dorsal scapular n.
- F: elevation the scapula
- B.S: Dorsal scapular art.
④ Rhomboid major
- O: spi. p: T1-T4
- I: Scapula
- N: Dorsal scapular n.
- F: elevation the scapula
- B.S: Dorsal scapular art.
⑤ levator scapula m.
- O: Transverse process- : C1-C4
- I: Scapula - supe. angle
- N: spinal nerves + dorsal scapular n.
- F: elevation of the scapula.
- B.S: Dorsal scapular art.
⑥ Serratus post. superior
- O: spinous process: C6-T2 (4)
- I: 2nd - 5th ribs
- N: intercostal n.
- F: elevation of the ribs
- B.S: post. intercostal art.
Intermediate muscles
⑦ Serratus post. infer. :
- O: T11 - L2 (4)
- I: 9th - 12th ribs
- N: intercostal n.
- B.S: Subcostal (branch of ant. intercostal) + upper lumber arteries.