Question
All of the following are true about Scalenus anterior muscle:
| A. |
It is attached to the 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
|
Show Answer
|
Correct Answer » D
Explanation
|
|
The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the scalenus anterior, scalenus medius, and scalenus posterior. These extend from the transverse processes of the cervical vertebrae to the first two ribs. Thus they help to either elevate the ribs of bend the neck laterally.
Of these scalenus medius is the largest and scalenus posterior is the smallest.
The scalenus anterior inserts into the scalene tubercle of the first rib, not the second rib.
The transverse cervical artery passes anterior to the scalenus anterior, not posterior to it.
The phrenic nerve runs on the anterior surface of the scalenus anterior muscle; it does not pierce it.
Subclavian vein lies anterior to scalenus anterior . Subclavian artery lies posterior to scalenus anterior. Hence It separates the subclavian vein from the subclavian artery
