All of the following are branches of subclan aery except :
**Core Concept**
The subclavian artery is a major artery that arises from the aortic arch and supplies blood to the upper limb, neck, and thoracic wall. It has several branches that supply these regions.
**Why the Correct Answer is Right**
The branches of the subclavian artery include the vertebral artery, internal thoracic artery, and thyrocervical trunk. These branches arise from the subclavian artery to supply blood to the corresponding regions. The vertebral artery supplies the posterior circulation of the brain, the internal thoracic artery supplies the anterior chest wall, and the thyrocervical trunk supplies the neck and shoulder region. The branches of the subclavian artery are critical for maintaining blood flow to these regions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the branches of the subclavian artery do not include the axillary artery, which is actually a continuation of the subclavian artery and not a separate branch.
**Option B:** This option is incorrect because the costocervical trunk is actually a branch of the thyrocervical trunk, not a direct branch of the subclavian artery.
**Option C:** This option is incorrect because the suprascapular artery is a branch of the thyrocervical trunk, not a direct branch of the subclavian artery.
**Clinical Pearl / High-Yield Fact**
The subclavian artery is a common site for atherosclerotic disease, particularly in the context of thoracic outlet syndrome. This can lead to arm claudication and other symptoms.
**Correct Answer: A. Axillary artery. Axillary artery.**