Which structure is formed from the nerves C1-C5 in the peripheral nervous system?

• A. Lumbar plexus
• B. Brachial plexus
• C. Cervical plexus
• D. Sacral plexus

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the concept of a nerve plexus. A nerve plexus is a network of intersecting nerves in the peripheral nervous system that serves specific regions of the body. The major plexuses include cervical, brachial, lumbar, and sacral plexuses.
2. Step 2: Identify the spinal nerves involved in the cervical plexus. The cervical plexus is formed by the anterior rami of spinal nerves C1-C5. These nerves contribute to motor and sensory innervation in the neck and upper shoulder region.
3. Step 3: Compare the cervical plexus to other plexuses. The brachial plexus involves nerves C5-T1 and serves the upper limbs, the lumbar plexus involves nerves L1-L4 and serves the lower abdomen and thighs, and the sacral plexus involves nerves L4-S4 and serves the pelvis and lower limbs.
4. Step 4: Recognize the specific function of the cervical plexus. It provides motor innervation to muscles such as the diaphragm (via the phrenic nerve) and sensory innervation to areas of the neck, shoulder, and upper chest.
5. Step 5: Conclude that the structure formed from nerves C1-C5 is the cervical plexus, based on its anatomical location and nerve composition.