lyo 



ELEMENTS OF MAMMALIAN ANATOMY 



with the lateral sinus just before it reaches the jugular foramen. 

 The inferior petrosal sinus, collecting blood from the base of the 

 brain, lies in the groove ventral to the petrosal bone, and unites 

 with the lateral sinus at the jugular foramen. The union of 

 these sinuses at this foramen forms the internal jugular vein. 



3h 



spmJ, 



J 



ca 



r.c 



hi 



r.r 



Fig. 85. — A, Ventral View of Heart and Main Arteries in the Trunk of 

 THE Rabbit. B, Arteries of Man. 

 a, Right atrium; ca, left carotid; c, ax, celiac axis; i. w, innominate; //, common 

 iliac; i. m. inferior mesenteric; /, r, left renal; r, r, right renal; r. c, right inter- 

 costals; sm, superior mesenteric; sp^n, spermatic; sa, sacral; sb, left subclavian. 



which extends deep beneath the muscles of the neck with the 

 carotid artery. It joins the external jugular opposite the 

 shoulder-joint. At the base of the skull the internal jugular 

 gives off a large transverse anastomosing vein to the vertebral, 



