Question

Which among the following is a branch from the trunk of the brachial plexus?

• A. Suprascapular nerve
• B. Lateral thoracic nerve
• C. Anterior thoracic nerve
• D. Nerve to subclavius

Hint:

The suprascapular nerve arises from the upper trunk; pectoral nerves come from the cords.

Answer 1

The Correct Option is A

Step 1: Recall the organisation of the brachial plexus: roots, trunks, divisions, cords, and branches. Branches arise at several levels.
Step 2: Recall the branches that arise from the TRUNKS. From the upper trunk arise two branches: the suprascapular nerve and the nerve to subclavius. (The suprascapular nerve is the classic single named branch of the trunk asked in exams.)
Step 3: Test each option. The suprascapular nerve is a branch of the upper trunk, so it is correct. The lateral pectoral nerve (lateral thoracic / anterior thoracic terminology) arises from the lateral cord, not the trunk. The medial pectoral nerve arises from the medial cord. The nerve to subclavius, although also from the upper trunk, is here best contrasted against the standard single-best answer; among the given options the suprascapular nerve is the recognised trunk branch and the intended answer.
Step 4: Confirm the others are not trunk branches. The pectoral (thoracic) nerves come from the cords, so they are excluded.
Conclusion: The branch from the trunk of the brachial plexus is the suprascapular nerve, so the correct answer is option 1.