Question

chapter 13 end of chapter review question 15
1 part | -- of 1 point

the phrenic nerve is a branch from the ______.

○ brachial plexus
○ vagus nerve
○ thoracic spinal cord
○ cervical plexus

Explanation:

To solve this, we recall the origin of the phrenic nerve. The phrenic nerve arises from the cervical plexus (specifically from the anterior rami of C3 - C5 spinal nerves, part of the cervical plexus). The brachial plexus supplies the upper limb, the vagus nerve is a cranial nerve with different functions, and the thoracic spinal cord doesn't give rise to the phrenic nerve.

Answer:

D. cervical plexus