Introduction – Lung Anatomy

by Jeremy Brown, PhD

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    00:01 In the basic course on respiratory disease, I will discuss first the anatomy of the lung, hoping to show you that the anatomy of the lung is dictated by its function. Then I'll describe the physiology of respiratory function. And then, in the subsequent lectures, I'll discuss how the doctor approaches the patient to take a history, examine the patient, and then thinks about and uses diagnostic tests to fully evaluate what the respiratory problem may be that the patient is presenting with. And the anatomy of the lung includes • The bones (the vertebrae, the ribs, the sternum) • The lower airways (the trachea, bronchial tree, bronchioles, and alveoli) • The blood supply to the lungs (the pulmonary arteries, veins, and the bronchial circulation as well as lymphatic drainage) • The muscles that move the lung (the thoracic cage muscles, the intercostals, the diaphragm) • The lining of the lung and the internal aspect of the thoracic cage (the visceral and parietal pleurae) • And we'll also touch on some of the nerves involved (the phrenic and the vagus nerve) One aspect I won't discuss—but is very important—is that the respiratory tract actually starts in the nose, so the upper airways are part of the respiratory tract as well, and that includes the nose, the mouth, the sinuses, the pharynx, the larynx, and the vocal cords.

    01:14 All right, so this diagram gives a general overview of the respiratory tract, and you can see in the middle, the gray objects are the lungs: the right lung on the right-hand side, the left lung on the left-hand side, and they're nestling either side of the heart in the pericardium. And on the outside, we have a layer of skin, muscle, and then we have bones, and you can see the pleurae, which actually hang down below both lungs on both sides. And underneath the thoracic cavity, we have the right and the left hemidiaphragms, which separate the thoracic cavity from the abdomen and are vital for respiration. Above the thoracic cavity, we have the trachea, which takes air in and out of the lungs and up into the upper airways in the neck. This is a more schematic diagram showing the airways in their entirety, starting at the nose, moving on to the pharynx, which is at the back of the nose, and then the larynx, the trachea, the bronchi, and then the lungs at the end of the respiratory tract. The lungs are kept within a articulated skeletal

    About the Lecture

    The lecture Introduction – Lung Anatomy by Jeremy Brown, PhD is from the course Introduction to the Respiratory System.

    Author of lecture Introduction – Lung Anatomy

     Jeremy Brown, PhD

    Jeremy Brown, PhD

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