Describe nerve supply of the lungs???

The lungs receive nerve supply from the autonomic nervous system, which is responsible for regulating involuntary bodily functions. The nerves that innervate the lungs originate from the parasympathetic and sympathetic divisions of the autonomic nervous system.

The parasympathetic nerves that supply the lungs arise from the vagus nerve, specifically the left and right vagus nerves. These nerves travel down from the brainstem and branch out to form the pulmonary plexus. The parasympathetic fibers within this plexus release acetylcholine, which acts on muscarinic receptors in the smooth muscles of the bronchi and bronchioles. Stimulation of these receptors causes bronchoconstriction, mucus secretion, and increased glandular activity, leading to decreased airflow and increased resistance in the airways.

On the other hand, the sympathetic nerves that supply the lungs arise from the sympathetic chain ganglia located in the thoracic region of the spinal cord. These nerves form the sympathetic chain, which runs alongside the vertebral column. The sympathetic fibers innervate the smooth muscles of the bronchi and bronchioles, as well as the blood vessels in the lungs. Stimulation of these fibers releases norepinephrine, which acts on adrenergic receptors. Activation of these receptors causes bronchodilation, relaxation of the smooth muscles, and vasoconstriction of the blood vessels in the lungs, leading to increased airflow and decreased resistance.

Overall, the nerve supply of the lungs plays a crucial role in regulating the diameter of the airways and blood vessels, thus influencing the airflow and blood flow within the lungs.