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mediastinum
(redirected from Posterior mediastinal cavity)

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
me·di·as·ti·num  (md--stnm)
n. pl. me·di·as·ti·na (-n)
The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.

[New Latin mediastnum, from neuter of Medieval Latin mediastnus, medial, from Latin, inferior servant, drudge (anatomical sense probably influenced by Latin intestnum, intestine), from medius, middle; see medhyo- in Indo-European roots.]

medi·as·tinal (-nl) adj.

mediastinum [ˌmiːdɪəˈstaɪnəm]
n pl -na [-nə] Anatomy
1. (Life Sciences & Allied Applications / Anatomy) a membrane between two parts of an organ or cavity such as the pleural tissue between the two lungs
2. (Life Sciences & Allied Applications / Anatomy) the part of the thoracic cavity that lies between the lungs, containing the heart, trachea, etc.
[from medical Latin, neuter of Medieval Latin mediastīnus median, from Latin: low grade of servant, from medius mean]
mediastinal  adj
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.mediastinum - the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymusmediastinum - the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body
chest cavity, thoracic cavity - the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart


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