Scalene muscles
| Anterior scalene | Middle + posterior scalenes | |
|---|---|---|
| Origin | Transverse processes C3-6 | Middle: C2-7 Posterior: C4-6 |
| Insertion | Scalene tubercle of 1st rib | ext border of 2nd rib |
in the neighbourhood
- brachial plexus passes through anterior and middle scalene muscles
- phrenic nerve runs inferiorly across anterior surface of anterior scalene
innervation
Anterior rami of cervical nerves:
- anterior - c5-8
- middle - c3-7
- posterior - c5-8
action
- accessory resp muscles - elevate 1st 2 ribs
- bends neck?