first and second posterior intercostal arteries

first and second posterior intercostal arteries

[TA]
terminal branches of the superior intercostal artery (from costocervical trunk) supplying the posterior portions of the upper two intercostal spaces.

first and sec·ond pos·te·ri·or in·ter·cos·tal ar·te·ries

(fĭrst sek'ŏnd pos-tēr'ē-ŏr in-tĕr-kos'tăl ahr'tĕr-ēz) [TA]
Terminal branches of the superior intercostal artery (from costocervical trunk) supplying upper two intercostal spaces.
Synonym(s): arteriae intercostales posteriores I et II, posterior intercostal arteries 1-2.