VEINS 97 



passes inwards, resting on the interosseous muscles and deep 

 to flexor tendons and lumbricals to the back part of the ist 

 interosseous space, and anastomoses with dorsalis pedis, 

 completing plantar arch. 



The plantar arch is placed across the tarsal end of the meta- 

 tarsus, and is accompanied by the deep branch of the external 

 plantar nerve. 



Branches from the Plantar Arch : 



Recurrent : small branches passing back to tarsal joints ; 

 anas, branches of internal plantar. 



Posterior perforating (3) : ascend to dorsum of foot through 

 posterior part of three outermost interosseous spaces ; anas. 

 interosseous of metatarsal. 



Digital (4) : supply both sides of three outer toes and outer 

 half of 2nd ; inner three bifurcate at the cleft of toes ; give 

 off at point of division, anterior perforating to anas, with inter- 

 osseous arteries of dorsum. 



THE VEINS. 



VEINS OF THE HEAD AND NECK. 



Cerebral : noted for their thin coats, absence of muscular 

 tissue and valves. 



Superior (10 to 12 on each side) : lodged chiefly in sulci on 

 cerebral surface, pass forwards and inwards to superior longi- 

 tudinal sinus. 



Anterior inferior: from under surface of anterior lobes; ter- 

 minate in cavernous sinus. 



Inferior lateral (3 to 5) : terminate in lateral sinus. 



Inferior median : from posterior lobe, etc., to straight sinus 

 behind venae Galeni. 



Venae Galeni (2, one from right, one from left lateral ven- 

 tricle) : formed by vena corporis striati and vena choroidea ; 

 pass backwards out of transverse fissure to unite and end in 

 straight sinus. 



Cerebellar : superior, inferior, and lateral sets ; the ist 

 open into straight, the 2nd into lateral, the 3rd into superior 

 petrosal sinuses. 



Sinuses (17 in number): Superior longitudinal: begins at 

 crista Galli, where it may communicate through foramen 



7 



