614 



TEE VEINS. 



the circumflex vein of the solar plexus, which they concur to form, and above, 

 with the coronary plexus, which is only a coatmuation of them. 



"C CoEONAiiT Venous Plexus.— The coronary venous plexus (Fig 



292, 2, 4) is arranged like a 

 F'g- 292. ramose garland around the second 



phalanx to the origin of the 

 third, and on the surface of the 

 cartilaginous apparatus which 

 completes the latter. 



" It is supported, like the 

 other venous networks of the 

 digit, by a fibrous texture imme- 

 diately subjacent to, and con- 

 tinuous with, the cerium of the 

 coronary substance, and is juxta- 

 posed, as well as adherent, to 

 the expansion of the extensor 

 tendon, the lateral cartilages, 

 and to the bulbous enlargements 

 of the plantar cushion. 



" This plexus proceeds from 

 the intra- osseous, podophyllous, 

 and solar networks. To facili- 

 tate its description, we recognise 

 in it three parts: one central 

 and anterior, situated between 

 the two cartilaginous plates, and 

 two lateral, corresponding to 

 these cartilages. 



" Central Part op the 

 Coronary Plexus. — The central 

 part of the coronary plexus (Fig. 292, 2), immediately subjacent to the 

 substance or cushion of that name, constitutes a very close network formed 

 by innumerable venous radicles, which rise in a tortuous manner from, 

 and are continuations of, the podophyllous plexus, until they reach a 

 large anastomotic vein thrown across from one cartilaginous plexus to 

 the other, and iuto which they open by ten to twelve principal mouths 

 (Fig. 292, 3'). 



" These veins of the central part of the coronary plexus gradually 

 increase in calibre, and diminish in number, from the podophyllus plexus, 

 where they take their origin, to their superior and terminating canal, which 

 itself only appears to be the result of their successive anastomoses. 



" Cartilaginous Plexus, or Lateral Parts op the Coronary Plexus. — 

 The cartilaginous plates serve to support, by their two faces and the 

 canaliculi by which they are traversed, a mass of very close, anastomosing, 

 and converging veins, which, from its situation, may be designated the 

 cartilaginous plexus. 



"This cartilaginous plexus is formed by two layers of vessels — a 

 superficial and deep. 



"Superficial cartilaginous layer or plexus. — The superficial layer (Fig. 

 292, 3, 4), extended over the external surface of the cartilaginous plates and 

 bulbs, has its origin by innumerable roots from the veins of that part of the 

 podophyllous plexus corresponding to the superficies it occupies. These 



THE VEINS OF THE POOT. 



