Thorax and lungs, Biology

Thorax and Lungs:

The  lungs, a pair of conical-shaped organs lie  in  the  thoracic cavity, protected by the bony  thorax composed of the  sternum and ribs a interiorly and ribs, scapulae and the vertebral column posteriorly. The apices of  lungs lie just  above the clavicles and  the concave base posteriorly extends to the  11th or 12th rib. The lung is described as having a medistinal and a costal surface. The costal surface is  in  contact with  the wall of  the pleural cavity which consist of  the  ribs and intercostals muscles  forming the  thoracic cavity. The thoracic cavity  is  lined with pleura. The pleura  is a continuous serous membrane; one surface of it  lines the inside of the rib &ge  knows as the parietal  pleura and the other surface covers the lungs knows as  the visceral pleura. The space between  the  two  surfaces is known as potential space, containing a  few milliliters of serous fluid that prevents friction between the  two surfaces. 

The  lungs are separated from each other by  the mediastinum which contains the heart and great vessels, the esophagus and, in  its upper part the trachea. The chief feature of the mediastinal  surface is  the presence of the hilum where the main  bronchus and pulmonary  artery enter and pulmonary veins leave the  lungs. Group of lymph glands which drain the  lungs are situated at the hylum and at the bifurcation of trachea. The right and  left lungs are divided by  deep fissures into lobes, the right lungs has upper, middle and lower lobes and left lung has upper and  lower. Each  lobe  is  further divided into segments. Air  is conducted to each segment through the bronchioles the  smallest branches of the bronchi.

336_lungus.jpg

Posted Date: 10/27/2012 7:52:42 AM | Location : United States







Related Discussions:- Thorax and lungs, Assignment Help, Ask Question on Thorax and lungs, Get Answer, Expert's Help, Thorax and lungs Discussions

Write discussion on Thorax and lungs
Your posts are moderated
Related Questions
Segregation and Treatment of Dressing Waste In many departments waste is less and normally they do not have treatment facility for the bio-medical waste. In their case, interme

BLOO D VESSELS - Some vessles supply blood to wall of large vessels these are vessel of vessels or vasa vasorum . Mainly artery and vein, 2 types of vessels present.

Q. Can you explain Antibiotics? The antibiotics are the chemicals produced by microorganisms which are able to destroy or inhibit the growth of other microorganisms. The therap

What is photoperiodism? Photoperiodism is the biological response shown by some living beings to their daily time of light exposure (photoperiod).

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Q What are the amphibian features that make them dependent on water to survive? Permeable skinexternal fecundation, body subject to dehydration, larval stage and eggs without s

Describe several factors which affect Productivity in Medical Transcription. Definition of Medical Transcription Show the various factors thataffect Productivity in Medi

Define The Names of Some Immemorial Plants? From the time immemorial plants have been known by some name, they are common, vernacular or local names given by different persons.

ELECTRON TRANSPORT CHAIN All processes require energy. In living cells, we constantly use energy for a number of biochemical reactions e.g. muscular movements, synthesis  of ne