HTHSCI 1H06 Lecture Notes - Lecture 42: Tunica Intima, Brachiocephalic Artery, Dorsalis Pedis Artery

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 1H06
• Professor: Alexander Ball

Document Summary

3. mammary gland, skin, vertebrae and spinal cord. Abdominal and pelvic viscera and lower extremities abdominal aorta pericardium, esophagus, bronchi, diaphragm, intercostal and chest muscles, Great cardiac vein, middle cardiac vein, small cardiac vein. Venous blood from gi organs and spleen go to the liver before going to the inferior vena cava. Vasa vasorum (arteries that supply other arteries) Veins have a much thinner layer and tunica externa. Veins have no elastic layers but they do have valves. Veins have almost no blood pressure to resist which means the vessel wall can be much thinner and weaker. The valves are necessary to prevent back ow and assist in venous blood return. Must resist the pressure from the contractions of the heart and provide pressure between heart beats. Tunica media is full of elastic bres of connective tissue. Elastic arteries expand when the blood pressure increases and contract with the blood pressure decreases.