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| | + | {{toplink |
| | + | |backcolour = FAFAD2 |
| | + | |linkpage =Cardiorespiratory System - Anatomy & Physiology |
| | + | |linktext =Cardiorespiratory System |
| | + | |maplink = Cardiorespiratory (Content Map) - Anatomy & Physiology |
| | + | |pagetype =Anatomy |
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| | + | <br> |
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| | ==Introduction== | | ==Introduction== |
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| − | The surface of the inner wall of all of the body cavities is lined by a serous membrane which consists of a single layer of flat epithelium with a thin underlying propria (connective tissue). Within the thoracic cavity, this is known as the ''pleura''. The '''visceral pleura''' which coats the outer surface of the lung is derived from the ''splanchnic mesoderm''. The '''parietal pleura''' lining the thoracic cavity is derived from '''somatic mesoderm'''. The '''pleural cavity''' is a potential space between the two areas of pleural membrane, which normally are adhesed to each other. | + | The surface of the inner wall of all of the body cavities are lined by a serous membrane which consists of a single layer of flat epithelium with a thin underlying propria (connective tissue). Within the thoracic cavity, this is known as the ''Pleura''. |
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| − | ==Pleural Membranes==
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| − | ===Structure of the Pleural Membranes===
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| − | [[Image:PleuralMembranesSchematic.jpg|right|thumb|350px|'''Schematic Diagram of the Pleural Membranes''' (Cross section through thoracic cavity at the level of the heart)]]
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| − | Each [[Lungs - Anatomy & Physiology|lung]] is placed within a separate layer of membrane, thus there are two pleural sacs. The space between the two sacs is known as the [[Mediastinum - Anatomy & Physiology|mediastinum]], and is almost in the midline of the thorax. The pleura covering the surface of the lung is known as '''pulmonary pleura''' or '''visceral pleura'''. This becomes continuous with the '''mediastinal pleura''', as it wraps around the [[Lungs - Anatomy & Physiology|lung]]. The '''diaphragmatic''' and '''costal pleura''' are continuous with the mediastinal pleura. Together, these three membranes are the '''parietal pleura'''.
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| − | Between the parietal and visceral pleura is the '''intrapleural space''', or '''pleural cavity'''. This contains a small amount of serous fluid which establishes adhesion between the layers and allows smooth movement between the lung and chest wall, and between individual lobes of the [[Lungs - Anatomy & Physiology|lungs]]. The [[Heart - Anatomy & Physiology|heart]] is invested in a parietal and visceral layer of [[Heart Structure - Anatomy & Physiology#Pericardium|'''pericardium''']] with the '''pericardial space''' separating the two membranes. Cranially, the costal and mediastinal pleura adjoin to form a 'dome' of pleura which extends to the thoracic inlet. This is known as the '''cupulae pleurae'''. This region is only protected by soft tissue, and thus is vulnerable to injury.
| + | ==Structure of the Pleural Membranes== |
| | + | [[Image:PleuralMembranesSchematic.jpg|right|thumb|350px|'''Schematic Diagram of the Pleural Membranes''']] |
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| − | Within the pleural sac encasing the right [[Lungs - Anatomy & Physiology|lung]], there is a fold which encases the vena cava. It is known as the '''Plica Venae Cavae'''. The pleural membranes are larger than the [[Lungs - Anatomy & Physiology|lungs]] which they encase, thus there are areas where the facing surfaces of parietal pleura touch each other. These are known as '''pleural recesses'''. One example is the '''costodiaphragmatic recess''', the space between the costal and diaphragmatic pleura. The volume of the recess varies to a point due to the phase of [[Ventilation - Anatomy & Physiology#Inspiration|inspiration]]/[[Ventilation - Anatomy & Physiology#Expiration|expiration]].
| + | *Each lung is placed within a separatte layer of membrane, thus there are two pleural sacs. |
| | + | *The space between the two sacs is known as the [[Mediastinum - Anatomy & Physiology|Mediastinum]]. |
| | + | ** |
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| − | ===Pleural Membrane Function=== | + | ==Function== |
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| − | The Pleural Cavity is filled with a small amount of serous fluid which forms a thin film of liquid between the pleural layers. This is vital in that it prevents separation of the two pleural layers and lubricates the surface, so the [[Lungs - Anatomy & Physiology|lungs]] can move easily within the thoracic cavity. The pleural fluid also provides surface tension, keeping the lung suitably close to the wall of the thorax, despite the lungs not being directly fixed to it. The pleurae thus allow the volume of the [[Lungs - Anatomy & Physiology|lungs]] to change with the volume of the thoracic cavity, enabling [[Ventilation - Anatomy & Physiology|ventilation]]. The left and right pleural sacs are separate so that in the event of one being punctured, the other lung can continue to function effectively.
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| | ==Vasculature== | | ==Vasculature== |
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| − | The pleural membranes are supplied by the '''bronchial''' and '''pulmonary arteries'''.
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| | ==Innervation== | | ==Innervation== |
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| − | '''Parietal Pleura''' is innervated by the intercostal nerves, with the mediastinal and diaphragmatic pleura also innervated by the phrenic nerve. '''Visceral pleura''' is innervated by the vagus nerve and sympathetic fibres. It is insensitive to pain stimuli.
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| − | ==Species Differences== | + | ==Lymphatics== |
| − | [[Image:Dogthorax1.jpg|right|thumb|350px|''The mediastinum is visible in this dog dissection, left lung removed. ©RVC 2008]]
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| − | In '''cattle''', the [[Mediastinum - Anatomy & Physiology|mediastinum]] is a tough membrane, in contrast to '''horses, dogs''' and '''cats''' where it is rather thin and more delicate.
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| − | '''Birds''' do not have a pleural cavity as [[Avian Respiration - Anatomy & Physiology|avian lungs]] do not have the capacity to inflate. The [[Respiration in Non-Homeotherms - Anatomy & Physiology|respiratory systems of non-homeotherms]] are also very different to that of mammals.
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| − | ==Links== | + | ==Histology== |
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| − | Click here for information on [[:Category:Pleural Cavity and Membranes - Pathology|pathology of pleural cavity membranes]].
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| − | {{Template:Learning
| + | ==Species Differences== |
| − | |powerpoints = [[Respiratory System Histology resource|Histology of the respiratory system, including the pleural membranes]]
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| − | }}
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| − | ==References==
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| − | {{citation|initiallast = Dyce|initialfirst = K.M|2last = Sack|2first = W.O|finallast = Wensing|finalfirst = C.J.G|year = 2002|title = Textbook of Veterinary Anatomy|ed =3rd|city = Philadelphia|pub = Saunders}}
| + | ==Links== |
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| − | {{citation|initiallast = Budras|initialfirst = K.D|2last = McCarthy|2first = P.H|3last = Fricke|3first = W|finallast = Richter|finalfirst = R|year = 2002|title = Anatomy of the Dog|ed =4th|city = Hannover|pub = Schlutersche GmbH & Co. KG, Verlag und Druckerei}}
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| − | {{review}}
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| − | ==Webinars==
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| − | <rss max="10" highlight="none">https://www.thewebinarvet.com/respiratory/webinars/feed</rss>
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| − | [[Category:Respiratory System - Anatomy & Physiology]]
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| − | [[Category:A&P Done]]
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