Arterial System in Chinese Tree Shrew (Tupaia belangeri chinensis)

The specimens involved in this paper include 3 males,2 females captured from Lu Quan County,China and are deposited as the anatomic examples in order to observe the arterial system under the surgical microscope.The results are as follows:The arterial system indicates evolutionary position of the animal.The characters of this animal are different from other animals,particular in primates,on the following respects:1.There are three branches on arcus aortae (anonyma,left common carotid and subclavian arteries),which are similar to the A type shown in the other primates;2.Stapedial artery including the superior branch (the thick one) and the inferior branches (the slendr one) are observed;3.Willis circle exist;4.Four branches originated from subclavian artery,whick are the vertebral branch,suprascapular branch,deep cervical and costo-cervical trunk;5.There are two trunks resulted from axillary artery,I.e.the common trunks consisting of thoraco-acromial,the lateral thoracic arteries,and those consisting circumflex humerus artery and subscapular artery;6.Brachial artery gives off only a branch,accompanied by ulnar nerves in the anterior arm,which becomes slender ulnar artery;7.In the anterior arm,brachial artery continue to become the mediana artery,instead of dividing into radial and ulnar arteries;8.Mediana artery gives off as four arteriae digitales palmares communes and no true palmar arch exists.But the most ulnaris arteries by the ulna communicate with the descend slender ulnar artery following the ulnar nerves;9.Common iliac artery was not observed,but the distal end of the abdominal aorta divided into the external and internal iliac arteries;10.Being smaller and slender,ischiac artery distribute in the muscules of posterior aspect of the thigh;11.From femoral artery,two branches are arisen directly.It correspond to its supplying area of the blood,the deep femoral artery existing in the human;12.In order to supply the blood of plantar area,saphenous artery continue to form posterior tibial artery;13.Dorsal pedes artery comes from anterior tibial artery.