Presentation on theme: "Gross anatomy of lungs There are a pair of lungs in the thoracic cavity. Each lung is covered by pleura. Protected by thoracic skeleton. Each lung has."— Presentation transcript:
1Gross anatomy of lungsThere are a pair of lungs in the thoracic cavity.Each lung is covered by pleura. Protected by thoracic skeleton.Each lung has an apex, a broad base or inferior surface, sharp anterior border, and sharp inferior border.Each lung has sterno-costal surface, diaphragmatic surface and mediastinal surface.Right lung is shorter than the left due to right lobe of liver pushing the right lung superiorly.There are 3 lobes in right lung and 2 lobes on left lung.There are two fissures in right lung, oblique and horizontal fissures.Left lung has only one oblique fissure.
2The pleura is a serous membrane over the lungs It has a parietal layer and a visceral layer.The space between them is the pleural cavity, containing a scanty amount of pleural fluid.The inflammation of pleura is called as pleurisy. The parietal pleura has somatic nerve supply and it is pain sensitive. Where as visceral pleura is pain insensitive.Due to injury pleural cavity may contain blood, it is hemothorax, pyothorax if it contains pus and pneumothorax if it contains air.
3The right lungThe right lung displaying its two main fissures the horizontal and the oblique one.They divide the right lung into three lobs "the upper lobe, the middle lobe, and the inferior lobe“.
4The left lung displaying its fissure that separates it into two lobes upper and lower.
5A Pancoast tumor, labelled 'P', in the right lung of a 47-year-old female smoker
6Hilum is situated on the mediastinal surface allowing structures to enter and leave the lung
9A bronchopulmonary segment is an independent unit The trachea divides into the left and right principal bronchi and enter the lung substance and divide.Each principal bronchus divides into secondary bronchi, superior lobar, middle lobar and inferior lobar bronchi. Each lobar bronchus divides in to tertiary bronchi. The lung substance attached to each tertiary bronchus constitutes a BP segment.Each segment has its own pulmonary arterial branch and thus, the bronchopulmonary segment is a portion of lung supplied by its own bronchus and artery.Each segment is functionally and anatomically discrete meaning that a single segment can be surgically removed without affecting its neighbours.
10Left lung Right lung A PALM Seed Makes Another Little Palm superior lobeapicalposterioranteriormiddle lobelateralmedialinferior lobesuperiormedial-basalanterior-basallateral-basalposterior-basalLeft lungsuperior lobeapico-posterior (merger of "apical" and "posterior")anteriorlingula of superior lobeinferior lingularsuperior lingularinferior lobesuperioranteromedial basal (merger of "anterior basal" and "medial basal")posterior basallateral basal
11As the trachea divides into two principal bronchi, the right bronchus is wider and shorter and runs more vertically than the left.Because of the right bronchus is wider and shorter and runs vertically than the left bronchus, aspirated foreign bodies are more likely to enter and lodge in it or one of its branches.