THE VASCULAR SYSTEM. 
145 
arm, and accompanies the subclavian artery. The external 
jugular veins are large 
vessels lying on either 
side of the neck beneath 
the platysma myoides 
muscle. When the skin is 
removed, the veins are 
plainly seen through this 
very thin muscle. The 
external jugular is formed 
ventral to the angle of 
the mandible by the union 
of the internal and exter- 
Fic. 78. VENTRAL VIEW OF THE 
CHIEF VEINS OF THE TRUNK, 
Neck, AND Heap. 
az, Azygos; au, anterior auri- 
cular; br, innominate; cd, 
caudal; cph, cephalic; em, 
anterior facial; ex, ex- 
ternal jugular; eic, external 
iliac; hp, hepatic; im, pos- 
terior facial; ij, internal 
jugular ; ims, inferior mesen- 
teric; im, iliolumbar; ilc, 
common iliac; wc, internal 
iliac; —, inferior labial; na, 
anterior facial; ov, ovarian 
or spermatic; pan, posterior 
auricular; pd, pancreato- 
duodenalis; psv, superior 
vena cava; pst, inferior vena 
cava; prt, portal; phrn, 
phrenic; 71n, renal; _ ste, 
superficial temporal; st, gas- 
tro-epiploica and coronary; 
sr, suprarenal; str, sternal 
or internal mammary; sf, 
gastrosplenic; sm, superior 
mesenteric; sbcl, subclavian; 
tr, transverse; tg, submental; 
vtr, vertebral; 1, 2, 3, 4, 5, 
6, the transverse foramina of 
the first six cervical verte- 
bre; w, intercostals; 4, su- 
perior intercostals. 
14 
SSS ee 
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