GROSS ANATOMY

Detailed explanation-1: -The pulmonary plexus is a network of autonomic nerves and ganglia situated at the pulmonary hila of each lung which regulates bronchial smooth muscle tone, mucus secretion from submucosal glandular mucous secretion, vascular permeability and blood flow.

Detailed explanation-2: -The walls of the bronchi and bronchioles are innervated by the autonomic nervous system. There are b2-adrenergic receptors in the bronchial epithelium and smooth muscle. The b2 receptors are responsible for bronchodilatation and secretion.

Detailed explanation-3: -The pulmonary vasculature is innervated by specific subsets of sympathetic, parasympathetic, and sensory nerve fibers. In contrast to most other organs, innervation density is highest at large-caliber vessels and decreases toward the periphery, and reactivity to vasoactive compounds also changes along the course.

Detailed explanation-4: -The lung receives innervation from two main sources: the pulmonary plexus (a combination of parasympathetic and sympathetic innervation) and the phrenic nerve. The pulmonary plexus is at the root of the lung and consists of efferent and afferent autonomic nerve fibers.

Detailed explanation-5: -The pulmonary plexus is an autonomic plexus formed from pulmonary branches of vagus nerve and the sympathetic trunk. It supplies the bronchial tree and the visceral pleura.