Middle cardiac nerve

The middle cardiac nerve (great cardiac nerve), the largest of the three cardiac nerves, arises from the middle cervical ganglion, or from the trunk between the middle and inferior ganglia.[1]

Middle cardiac nerve
Diagram of the cervical sympathetic.
Details
From	middle cervical ganglion
Identifiers
Latin	nervus cardiacus cervicalis medius
Anatomical terms of neuroanatomy

On the right side it descends behind the common carotid artery, and at the root of the neck runs either in front of or behind the subclavian artery; it then descends on the trachea, receives a few filaments from the recurrent nerve, and joins the right half of the deep part of the cardiac plexus.

In the neck, it communicates with the superior cardiac and recurrent nerves.

On the left side, the middle cardiac nerve enters the chest between the left carotid and subclavian arteries, and joins the left half of the deep part of the cardiac plexus.