The lobes are further divided into segments and then into lobules, hexagonal divisions of the lungs that are the smallest subdivision visible to the naked eye. The lungs are divided into the right lung and left lung. Each lobule, measuring about one millimetre in diameter, consists of numerous cords of rectangular liver cells, or hepatocytes, that radiate from central veins, or terminal hepatic venules, toward a … The lower lobe is the bottom lobe of the right lung. l's of epididymis the wedge-shaped parts of the head of the epididymis, each comprising an efferent ductule of the testis. All lung lobes have the same primary function: to receive oxygen rich air as it travels through the respiratory tract and to harbor the exchange of oxygen and carbon dioxide in the alveoli. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The lobules are arranged into segments that comprise the lung lobes. After entering the lungs, the right bronchus divides into three lobar bronchi, while the left bronchus divides into two lobar bronchi [10] – one for each of the lung lobes. Between the lobules run the secondary bronchial branches and the pulmonary arterial branches. All the lung lobes have the same primary function – receiving oxygen-rich air as it travels down the airways and housing the oxygen-carbon dioxide exchange in the alveoli [13]. lobule of lung: One of the physiological units of the lung consisting of a respiratory bronchiole and its branches (alveolar ducts, alveolar sacs, and alveoli). For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. ; The slightly larger right lung is divided into the superior lobe, middle lobe, and inferior lobe lobe. Legal. The human left lung is divided into two lobes, an upper and a lower, by the oblique fissure. The Left Lung: This has a concave depression that accommodates the shape of the heart, called the cardiac notch. The right lung has three lobes, whereas the left lung has only two lobes. It bears medial and lateral bronchopulmonary segments. Conversely, more than the expected number of lobes may be produced by new fissures e.g. Master respiratory system anatomy with these interactive quizzes, worksheets and labeled diagrams. [ "article:topic", "license:ccbysa", "showtoc:no" ], https://med.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fmed.libretexts.org%2FBookshelves%2FAnatomy_and_Physiology%2FBook%253A_Anatomy_and_Physiology_(Boundless)%2F21%253A_Respiratory_System%2F21.4%253A_The_Lungs_and_Pleurae%2F21.4B%253A_Lobes_Fissures_and_Lobules, Distinguish between the right and left lungs based on their lobes, fissures, and lobules. The left lung has only two formal lobes because of the space taken up in the left side of the chest cavity by the heart, though it does have the lingula, which is similar to a lobe. Blood circulation is very important, as blood is required to transport oxygen from the lungs to other tissues throughout the body. Primary pulmonary lobule is not a term used with any frequency in HRCT, but is the reason the secondary pulmonary lobule has its name.. A primary pulmonary lobule is defined as the lung unit distal to the respiratory bronchioles. Have questions or comments? The alveoli branch off from the bronchioles and bronchi that connect to the trachea and allow air to pass into the lungs. The hilium is important because it is the primary way in which the respiratory system links with the cardiovascular and nervous systems. The oblique fissure separates the superior and inferior lobe Which regions serve as a dual function for respiration and digestion (nasopharynx, oropharynx, laryngopharynx) and how? The right lung has three lobes and left has two lobes. The left lung is divided into two lobes, the superior lobe and the inferior lobe, by the oblique fissure.The left lung is somewhat smaller than the right and has a cardiac notch, a deviation in its anterior border that accommodates the heart. hepatic lobule one of the small vascular units composing the substance of the liver. The function of the … …of clusters of cells called lobules, where the vital functions of the liver are carried out. The diaphragm contracts during inhalation, and relaxes during exhaltion. The lobes are further separated into smaller segments, with the right lung having 10 segments and the left lung having 9 [2]. Visceral pleura ... Intrapleural space. Each alveolus is tightly wrapped in blood vessels and it is here that gas exchange actually occurs. This gas is a waste product that is made by the cells during their normal, everyday functions. eval(ez_write_tag([[250,250],'therespiratorysystem_com-large-mobile-banner-1','ezslot_1',114,'0','0']));eval(ez_write_tag([[250,250],'therespiratorysystem_com-large-mobile-banner-1','ezslot_2',114,'0','1']));Oblique Fissures: Separates the superior or upper lobe from the lower lobes of both lungs [9]. Published on November 13th 2017 by admin under. The upper lobe of the left lung contains anterior and apicoposterior bronchopulmonary segments. Hi, and I apologize in advance that I may not be able to answer your question to your satisfaction. The lungs are located in two chambers of the thoracic cavity on either side of the heart. The secondary pulmonary lobules measure approximately 1-3 centimeters in diameter and are most anatomically well-defined along the surface of the lungs. 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