Question

The cervical plexus gives rise to 2 out of the 3 roots that make up the phrenic nerve. A.True B.False

Answer 1

The statement is false because the phrenic nerve arises from spinal nerves C3, C4, and C5, not just two of them. This nerve is important for diaphragm function and respiration.

Step-by-step explanation:

The statement that the cervical plexus gives rise to 2 out of the 3 roots that make up the phrenic nerve is false. The phrenic nerve, which is essential for respiratory diaphragm function, arises from spinal nerves C3, C4, and C5. These nerves combine to form the phrenic nerve that innervates the diaphragm, a major muscle involved in respiration. Any damage to these cervical levels, especially C3 to C5, may affect breathing because these nerves are responsible for the motor fibers that drive muscle contractions during ventilation.