GENERAL HISTOLOGY

Detailed explanation-1: -The blood supply to the diaphragm is from the superior phrenic, musculophrenic, inferior phrenic, pericardiacophrenic, and lower internal intercostal arteries. The superior phrenic arteries arise from the thoracic aorta.

Detailed explanation-2: -The phrenic nerves provide motor innervation to the diaphragm and work in conjunction with secondary respiratory muscles (trapezius, pectoralis major, pectoralis minor, sternocleidomastoid, and intercostals) to allow respiration.

Detailed explanation-3: -The descending thoracic aorta passes through the diaphragm’s aortic hiatus at the T12 vertebral level at which point it continues as the abdominal aorta. The abdominal aorta terminates as it bifurcates into common iliac arteries, which subsequently provide arterial supply to the pelvis and lower limbs.

Detailed explanation-4: -Three important structures pass through the diaphragm: the esophagus, and the two main blood vessels of the lower half of the body, the inferior vena cava, and the descending aorta.