Question

Which of the following important nerves originate from brachial plexus?
A. Radial
B. Obturator
C. Phrenic
D. Median
E. Ulnar

• A. A, D and E only
• B. A, C and D only
• C. A, C and E only
• D. A, B and C only

Hint:

Brachial plexus → Radial, Median, Ulnar, Axillary, Musculocutaneous. Lumbar plexus → Obturator. Cervical plexus → Phrenic.

Answer 1

The Correct Option is A

Step 1: Brachial Plexus Composition.
The brachial plexus is a nerve network formed by the ventral rami of spinal nerves C5 through T1.
It innervates the upper limb, including the shoulder, arm, forearm, and hand.

Step 2: Key Brachial Plexus Nerves.
- Radial nerve (A): Serves posterior muscles of the arm and forearm.
- Median nerve (D): Innervates the majority of forearm flexors and specific hand muscles.
- Ulnar nerve (E): Supplies intrinsic hand muscles and some forearm flexors.

Step 3: Non-Brachial Plexus Nerves.
- Obturator nerve (B): Arises from the lumbar plexus (L2–L4), not the brachial plexus.
- Phrenic nerve (C): Originates from the cervical plexus (C3–C5), not the brachial plexus.

Step 4: Determination.
Therefore, the Radial, Median, and Ulnar nerves are the correct nerves originating from the brachial plexus.