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: Structure of brachial plexus.
The brachial plexus is a network of nerves formed by the ventral rami of spinal nerves C5–T1.
It supplies the upper limb (shoulder, arm, forearm, and hand).
Step 2: Major nerves from brachial plexus.
- Radial nerve (A): Supplies posterior arm and forearm muscles.
- Median nerve (D): Supplies most forearm flexors and some hand muscles.
- Ulnar nerve (E): Supplies intrinsic hand muscles and some forearm flexors.
Step 3: Excluded nerves.
- Obturator nerve (B): Originates from lumbar plexus (L2–L4), not brachial plexus.
- Phrenic nerve (C): Originates from cervical plexus (C3–C5), not brachial plexus.
Step 4: Conclusion.
Thus, the correct nerves from brachial plexus are Radial, Median, and Ulnar.