the podophyllous plexuses,
and following the direction of the artery of the same name. The circumflex
vein terminates by forwarding branches to concur in the formation of the
superficial coronary plexus.

_(b) The Podophyllous or Laminal Plexus_.--The podophyllous veins
anastomose below with the circumflex vein of the solar plexus, and above
with the veins of the coronary plexus.

_(c) The Coronary Plexus_.--This proceeds from the podophyllous, the
intra-osseous, and the solar networks, and consists of a _central_ and _two
lateral parts_.

The _central_ portion lies between the lateral cartilages and immediately
under the coronary cushion. The _lateral portions_ are ramifications on
both surfaces of the lateral cartilages. The ramifications on the lateral
cartilages may be again distinguished as _superficial_ and _deep_. The
superficial layer is distributed over the external face of the cartilage,
forming thereon a dense network, and finally converges towards the superior
limit of the plexus to form ten or twelve principal branches, which again
unite to form two large vessels. These vessels, by their final fusion at
the lower end of the first phalanx, constitute the digital vein. The deep
layer is formed, as before described, by ascending branches from the
posterior parts of the podophyllous and solar plexuses, and by branches
from the intra-osseous system of the pedal bone. The veins of this deep
layer finally drain into the two vessels proceeding from the superficial
layer, which go to the formation of the digital vein.

THE DIGITAL VEINS--These arise from the network formed on the surfaces of
the lateral cartilages, and ascend in front of the digital arteries to
unite above the fetlock, where they form an arch between the deep flexor
and the suspensory ligament. From this arch (named the _Sesamoidean)_
proceed the Metacarpal Veins.

THE METACARPAL VEINS.--Three in number, they are distinguished as an
_Internal_ and an _External Metacarpal_, and a _Deep_ or _Interosseous
Metacarpal_. As we shall be concerned with these in the higher operation of
neurectomy, we may give them brief mention.

THE INTERNAL METACARPAL VEIN, the largest of the three, has relations
with the internal metacarpal artery and the internal plantar nerve. These
relations were shortly discussed under the section devoted to the arteries,
to which the reader may refer.

THE EXTERNAL METACARPAL VEIN.--This ascends on the external side of the
f