posterior intercostal veins


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pos·te·ri·or in·ter·cos·tal veins

[TA]
veins draining the intercostal spaces posteriorly; those of the first 1-C space drain into the brachiocephalic veins; from spaces 2-3, they drain into right and left superior intercostal veins; from the 4th-11th spaces on the right, they are tributaries of the azygos vein; on the left, they empty into either the hemiazygos or accessory hemiazygos veins.
Farlex Partner Medical Dictionary © Farlex 2012

pos·te·ri·or in·ter·cos·tal veins

(pos-tēr'ē-ŏr in'tĕr-kos'tăl vānz) [TA]
Drain the intercostal spaces posteriorly; those of the first intercostal space drain into the brachiocephalic veins; from the 2nd-3rd, they drain into right and left superior intercostal veins; from the 4th-11th spaces on the right, they are tributaries of the azygos vein; on the left, they empty into either the hemiazygos or accessory hemiazygos veins.
Synonym(s): venae intercostales [TA] .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
At the beginning of azygos arch, right superior intercostal veins joins it having received the 2nd, 3rd and 4th posterior intercostal veins. At the level of 4th thoracic vertebra, azygos vein arches above the hilar structure of right lung to enter the SVC with oesophagus medial to it in the posterior mediastinum.
Maksoud, "The second and third right posterior intercostal veins: an alternate route for central venous access with an implantable port in children," Journal of Pediatric Surgery, vol.
It ascends cranially draining the lower eight right posterior intercostal veins (RPIVs) into the superior vena cava at the level of T3 (Snell).
The unicolumnar type consisted of a single vein located in the midline draining the posterior intercostal veins from both sides.
In the third type 2A cadaver a longitudinal vein connected to the left superior intercostal vein, which then descended to drain the 4th to 9th left posterior intercostal veins terminating by joining the HV at the level of T10-T11 after crossing anterior to the 10th left posterior intercostal vein: this longitudinal vein can be considered an AHV draining into the HV.
Three type 3 variations were observed in which the AV and HV united to form a single vein located in the midline draining the right and left posterior intercostal veins into the SVC.
The origin of the AHV was highly variable as it was formed at different levels from the union of the posterior intercostal veins and often communicated with the left superior intercostal vein.
The AV drained the eight lower right posterior intercostal veins in 30 % of cadavers, with its termination observed to be between T2 and T3.
The HV drained the lower four left posterior intercostal veins in 33 % of cadavers, with its termination being between T6 and T10.
The preaortic interazygos vein was a direct continuation of the hemiazygos vein which drained the 9th to 11th left posterior intercostal veins. The venous vessel passed obliquely on the anterior surface of the aorta to open into the azygos vein at T9 vertebral level (Fig.
The interazygos veins can be formed by independent left posterior intercostal veins uniting to form a common trunk, the hemiazygos, accessory hemiazygos veins or the commonly found hemiazygos - accessory hemiazygos anastomosis (Celik et al, 1996; Gilkeson et al, 1997; Ozbek et al, 1999; Ozdemir et al, 2002).
All the right posterior intercostal veins are traced to the site of their termination into the azygos vein.

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