Head and Neck
All of the following are true about Scalenus anterior muscle except (AIIMS – Nov - 2010)
|A||It is attached to the scalene tubercle of second rib|
|B||It is anterior to the transverse cervical artery|
|C||It is pierced by the phrenic nerve|
|D||It separates the subclavian vein from the subclavian artery|
1. Scalenus anterior is attached to scalene tubercle on first rib.
2. Usually ‘transverse cervical artery’ passes anterior to the scalenus anterior muscle but variations have been documented and the muscle may be anterior to the artery.
3. Phrenic nerve passes anterior to the scalenus anterior muscle. Sometime it is seen piercing the muscle as a variation.
Scalenus anterior muscle is sandwiched between the subclavian artery and vein, separating the two on the first rib. The artery lies posterior and the vein is anterior to the muscle