NO. II DIGESTIVE CANAL OF AMERICAN ALLIGATOR REESE 



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;;;/, muscle layer. 



mp, muscle plate. 



ms, mesentery. 



jiiv, meatus venosus. 



m.v, maxillary fold. 



inyc, myocoel. 



n, nasal cavity. 



)ia, neural arch of vertebra. 



iu\ ncurenteric canal. 



Ill, nervous layer of ectoderm. 



nt, notochord. 



0, ear vesicle. 



oc, optic cup. 



oe, oesophagus. 



oil, optic nerve. 



OS, optic stalk. 



oz', optic vesicle. 



p, pituitary body. 



pa, posterior appendage. 



pag, post-anal gut. 



pan, pancreas. 



pan', opening of pancreas. 



pc, posterior cardinal vein. 



pc, pes. 



pg, primitive groove. 



pli, pharynx. 



pip, posterior intestinal portal. 



pi. pelvis. 



pn, posterior nares. 



pr, pericardial cavity. 



ps, primitive streak. 



pt. pecten. 



py, pylorus. 



r, rib. 



rt, retina. 



s, somites. 



sc, spinal cord. 



se, spenethmoid cartilage. 



sg, spinal ganglion. 



si, submucosa. 



sm, splanchnic mesoblast. 



sn spinal nerve. 



so, somatic mesoblast. 



st, stomodaeum. 



sy, sympathetic nervous system. 



t, tail. 



ta, trachea. 



tg, thyroid gland. 



tn, tongue. 



to, tooth anlage. 



tr, trunchus arteriosus. 



tz', tz'\ third ventricle of brain. 



ty, thymus gland. 



u, umbilical stalk. 



v', v", v'", first, second, and third 



cerebral vesicles. 

 va, vascular area. 

 vc, vocal cords. 

 vin, vitelline membrane. 

 vn, ventricle of heart. 

 vp, velum palitum. 

 vv, vitelline blood vessels. 

 zed, Wolffian duct. 

 zudo, opening of Wolffian duct. 

 zvr. Wolffian ridge. 

 zvt, Wolffian tubule. 

 .Y, point of origin of bronchi. 

 y, yolk. 

 ys, yolk-stalk. 



