postcostal anastomosis

post·cos·tal a·nas·to·mo·sis

longitudinal anastomosis of intersegmental arteries giving rise to the vertebral artery.

post·cos·tal a·nas·to·mo·sis

(pōst-kos'tăl ă-nas'tŏ-mō'sis)
Longitudinal anastomosis of intersegmental arteries giving rise to the vertebral artery.