416 THE DEVELOPMENT OF THE CHICK 
(caudal sclerotome halves) beneath the notochord is known as 
the subnotochordal bar (Froriep). It forms earler than the 
remainder of the body of the vertebra and during the membranous 
stage is thicker, thus forming a ventral projection at the cephalic 
end of the vertebral body that is very conspicuous (lig. 235). 
‘8 
Gn ty 
rg 
coud. Sel, 
3A 
ceph Sel. 
Gn 
My 
caud Se/ ~Ft 
sA 
ceph, Jel 
2 Z Poy? « 
My A We <a 
a , 8 
AN) ot 
Peeters Nt by 
o & 
" 
mordia as Fig. 233, at a higher level through the neural arches. 
a. C., Anterior commissure of the spinal cord. v. R., Ven- 
tral root of spinal nerve. Other abbreviations as before (Fig. 
929 
404 
Ne 
It chondrifies separately from the vertebral body and earlier. 
Except in the case of the first vertebra it fuses subsequently 
with the remainder of the vertebral body, and disappears as 
