Various branching pattern of aortic arch in the Siberian roe deer (543.7)

Abstract

This study examined the branching pattern of the aortic arch and its major branches in Siberian roe deer (Capreolus pygargus) and compared its branching patterns with those of other ruminants. Silicone casts were taken from 16 carcasses (male 7, female 9) with body weights ranging from 7.70~26.35 kg. Silicone casts of the vessels were made by a retrograde injection into the abdominal aorta. Only the brachiocephalic trunk (Bct) branched from the aortic arch in all carcasses. The left costocervical trunk (LCct) branched off as the first branch of Bct in 2 cases, but, in 9 of the 16 cases, the LCct and the left subclavian artery (LSb) were branched off first at the same level; rest 5 case had LCct from LSb. The right costocervical trunk (RCct) branched separately off before the right subclavian artery (RSb) was exhibited in 7 cases. The case that Bct trifurcated into the bicarotid artery (Bc), the RCct and the RSb was observed in 3 cases; however, Bct bifurcated in to Bc and RSb from which the RCct branched off as the first artery were showed in 5 cases. The right common carotid artery (RCc) branching at same site with RCct so that having no Bc was observed in only 1 case. In 4 cases the highest intercostal artery (Hi) formed the common trunk with the dorsal scapular artery (Ds). The combination in these different branching orders of costocervical trunk in both side and the formation of common trunk of Hi and Ds resulted in 12 types of the branching patterns in Siberian roe deer. These results suggest that the Siberian roe deer has a Bct with various branching patterns and its types are different with those of other ruminants.Grant Funding Source: Supported by NRF‐2013028138