longitudinal anastomosis of intersegmental arteries in the embryo that gives rise to the thyrocervical and costocervical trunks.
pre·cos·tal an·as·to·mo·sis
(prē-kos'tăl ă-nas'tŏ-mō'sis) Longitudinal anastomosisof intersegmental arteries in the embryo that gives rise to the thyrocervical and costocervical trunks.