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Qu'est-ce (qui) est tunica adventitia ductus deferentis - définition
OUTER LAYER OF BLOOD VESSEL
Tunica adventitia; Adventitia externa; External coat; Tunica adventitia (vessels); Tunica externa vasorum; Tunica adventitia vasorum; Tunica externa (vessels)
![Transverse section through a small [[artery]] and [[vein]] of the [[mucous membrane]] of the [[epiglottis]] of a child. (Tunica adventitia is at 'a')](https://commons.wikimedia.org/wiki/Special:FilePath/Gray448.png?width=200 "Transverse section through a small [[artery]] and [[vein]] of the [[mucous membrane]] of the [[epiglottis]] of a child. (Tunica adventitia is at 'a')")
Tunica externa
The tunica externa (New Latin "outer coat"), also known as the tunica adventitia (New Latin "additional coat"), is the outermost tunica (layer) of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and, in arteries, is supported by external elastic lamina.
adventitia
OUTER LAYER OF FIBROUS CONNECTIVE TISSUE SURROUNDING AN ORGAN, VESSEL, OR OTHER STRUCTURE
Adventitial
[?adv?n't???]
¦ noun the outermost layer of the wall of a blood vessel.
Derivatives
adventitial adjective
Origin
C19: shortening of mod. L. tunica adventitia 'additional sheath'.
Patent ductus arteriosus
CONDITION WHEREIN THE DUCTUS ARTERIOSUS FAILS TO CLOSE AFTER BIRTH
Patent ductus; Ductus arteriosus, patent; Patent Ductus Arteriosus; Ductus arteriosus persistens; Adult patent ductus arteriosus; Persistent ductus arteriosus
Patent ductus arteriosus (PDA) is a medical condition in which the ductus arteriosus fails to close after birth: this allows a portion of oxygenated blood from the left heart to flow back to the lungs by flowing from the aorta, which has a higher pressure, to the pulmonary artery. Symptoms are uncommon at birth and shortly thereafter, but later in the first year of life there is often the onset of an increased work of breathing and failure to gain weight at a normal rate.
Wikipédia
Tunica externa
The tunica externa (New Latin "outer coat"), also known as the tunica adventitia (New Latin "additional coat"), is the outermost tunica (layer) of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and, in arteries, is supported by external elastic lamina. The collagen serves to anchor the blood vessel to nearby organs, giving it stability.
The three layers of the blood vessels are: an inner tunica intima, a middle tunica media, and an outer tunica externa.
