GENERAL HISTOLOGY

Detailed explanation-1: -Abdominal aorta. The abdominal aorta emerges from the aortic orifice of the diaphragm at the level of T12 vertebra. It begins its course anterior and to the left of the vertebral column and continues downwards for about 10 cm.

Detailed explanation-2: -The descending aorta has two parts. The aorta begins to descend in the thoracic cavity and is consequently known as the thoracic aorta. After the aorta passes through the diaphragm, it is known as the abdominal aorta.

Detailed explanation-3: -The thoracic aorta begins at the aortic arch and runs anterior to the middle axis of the vertebral body. The position of the aorta changes with the arrangement of spine.

Detailed explanation-4: -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.