Biol129_C16 - Pleurae and Lungs The Lungs Main organ of the...

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1 Pleurae and Lungs The Lungs • Main organ of the thorax and essential for respiration • There are two multi lobed lungs – Right has 3 lobes, left 2 lobes • Attached at the hilus by a centrally located “root” – containing the vessels and bronchi • Lungs have a superior apical region and an inferior basal region
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2 Lungs - 2 • The right lung has a middle lobe – Remember heart on left • Both have an oblique fissure • The middle lobe creates a horizontal fissure • The medial aspect of each lobe has special surface features that match anatomy
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3 Lungs - 3 • On the right lung – Esophageal groove – SVC groove, IVC groove • On the left lung – Aortic arch groove – Large cardiac impression Airways • The trachea descends into the thorax and splits at the level of the sternal angle • There is a right and left main bronchus • Right is wider, shorter and runs more vertically than the left • The left passes inferior to the aorta and anterior to thoracic aorta
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4 Airways - 2 • The main bronchi further divide into lobar bronchi and then into segmental bronchi • Each lobe has five segmental bronchi to serve bronchopulmonary segments – Exception: since right lung has an extra lobe, the superior lobe has 3 segments with the middle has 2 segments (that is 5 combined) – The segments are Superior (or Apical) then a Bronchi
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Bronchopulmonary Segments • Large anatomic subdivisions of lung • Segments separated by CT septa – Implies they are surgical subdivisions • Each segment has an apical presentation toward the root and a basal presentation at the pleural surface • Each drained by pulmonary vv in CT between segments Progressive Segments • Beyond Segmental bronchi, naming ends • These give rise to 20-25 terminal bronchioles • Terminal bronchioles serve multiple respiratory bronchioles . • Respiratory bronchioles serve 2-11
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This note was uploaded on 03/31/2008 for the course BIOL 129 taught by Professor Sachshowardgeor during the Spring '08 term at Pennsylvania State University, University Park.

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Biol129_C16 - Pleurae and Lungs The Lungs Main organ of the...

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