Inferior cardiac branches of the vagus nerve

Inferior Cardiac Branches of the Vagus Nerve

The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. (Inferior cardiac nerve labeled at center right.)

The Inferior Cardiac Branches of the Vagus Nerve are a group of nerve fibers that originate from the vagus nerve and provide parasympathetic innervation to the heart. These branches play a crucial role in the regulation of heart rate and cardiac function.

Anatomy

The inferior cardiac branches arise from the vagus nerve at the lower part of the neck. They descend along the esophagus and form a network of nerves known as the cardiac plexus. The branches then continue to the heart, where they provide parasympathetic innervation.

Function

The inferior cardiac branches of the vagus nerve are responsible for slowing the heart rate. They release acetylcholine, a neurotransmitter that reduces the rate of spontaneous depolarization in the heart's pacemaker cells, thereby slowing the heart rate.

Clinical Significance

Damage to the inferior cardiac branches of the vagus nerve can lead to a condition known as tachycardia, where the heart rate is abnormally high. This can result in symptoms such as shortness of breath, chest pain, and fainting.

See Also

• Vagus nerve
• Cardiac plexus
• Tachycardia