The heart is innervated by autonomic nerve fibers which arise from the cardiac plexus, located on the bifurcation of the trachea.

File:2018 Conduction System of Heart.jpg - Wikimedia Commons
Figure 1. Nerve conduction of the heart (Credit: OpenStax, CC BY-SA 4.0)

Description

The cardiac plexus can be divided into superficial and deep cardiac plexus.

Sperficial cardiac plexus

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