98 



ANATOMY OF THE RABBIT 



artery is attached to the caudal region of the arch of the aorta by 

 the arterial (Botallo's) ligament which was a functioning 

 vessel in fetal Hfe and, with the foramen ovale, conducted the 



^^ — p 



Fig. 26. — Principal branches of thoracic aorta. AC, ascending cervical; B, 

 innominate; C, coronaries; CA, cervical axis; EC, external carotid; EM, external 

 maxillary; I, first pair of ribs; IC, intercostals; IM, internal mammary; IN, 

 internal carotid; IT, inferior thyroid; LCC, left common carotid; LS, left sub- 

 clavian; P, phrenics; RCC, right common carotid; V, vertebral. 



blood from the pulmonary artery to the aorta, thus preventing 

 the blood from passing to the lungs. At birth this duct and the 

 foramen ovale normally close, and at this time pulmonary 



