THE PIGEON. 233 



The arteries are distinguished by transverse, the veins by longitudinal 

 shading: only the anterior and posterior portions of the vessels of the 

 neck (carotids and jugulars) are shown : the kidneys are represented in 

 outline, the right (left of figure) being supposed to be partly dissected 

 away to show the vessels traversing it : the apex of tht; heart and the 

 coccygeo-mesenteric vein {c.m.v) are displaced to the left. 



a.ao, arch of the^aorm: a.m. a, anterior mesenteric artery; a.r.v, 

 afferent renal veins : a.r.i/, vein bringing blood from pelvis into renal 

 portal system : br.a, brachial artery : br.v, brachial vein ; ,.-, caudal 

 artery and vein; c.c. common carotid artery: c.m.v, coccygeo-mesen- 

 teric vein : ca.a,- cceliac artery": d.ao, d orsal a orta : e.c, external carotid 

 artery: epg, epigastric vein: c.r.v, efferent renal veins ;/;«, femoral 

 artei-y : f.z\ femoral vein : h.v, hepatic vein : i.c, internal carotid artery : 

 i.il, internal iliac artery and vein : i.m, internal mammary artery and 

 vein : in.a, innoniinate_artery : i.v, iliac vein : ju, ju gular vein : ju', 

 anastomosis of jugular veins: l.au, left auricle : /,/.a7l£SZSlmonary 

 artery : l.prc, IglL preca val vein ; l.vn, left ventricle ; pc, lefc pectoral 

 arteries and veins- : pea, right pectoral artery : pc.v, right pectoral vein : 

 p.m. a, posterior mesenteric artery \ ptc, gostcayal vein : r.a.i, anterior, 

 r.a.2, middle,, and r.a.^, posterior, reiial~artery : r.^i7{, right auricle : 

 r.p, renal portal vein : r.p.a, rip ht pulnto nary-arrery :, 'r.prcj ^ight pre- 

 caval vein ; r.v, renal vein : r.'vn, right ventricle: sea, sciatic artery : 

 sc.v, sciatic vein: sd.a, subclavian artery : vr. Vertebral artery and 

 vein. 



219. The femoral vein (/w), a large trunk returning 

 the greate^ part of the blood from the leg,' and passing 

 between the anterior and middle lobes of the kidney to join 

 the iliac vein. 



Just after entering the body cavity from- the leg, the femoral receives 

 a small vein, which runs along the ventral edge of the pubis, and collects 

 the blood from the side wall of the pelvis. 



220. The principal renal vein (r.?'), a large longitudinal 

 vessel on the ventral surface of the kidney, entering the 

 iliac vein at its junction with the femoral. 



The reiial vein receives several efferent renal veins (e.r.v) from the 

 middle and posterior lobe of the kidney : the blood from the anterior 

 lobe is poured by a separate efferent vein directly into the iliac. 



^ It ihe muscles are to be dissected in the same specimen, it will 

 be advisable to defer tracing the blood-vessels into the leg for the 

 present, and to follow them at a later stage (see §§ 328—337, pp. 252- 

 254), pari passu with the dissection of the muscles of the thigh. 



