188 



STUDY OF PIG EMBRYOS. 



Ec. Sp.c. 



N.cerv.i. 



Ao.D. 



P.M. 



Fig. 



117. — Pig, 12.0 MM. Transverse Series 5, Section 292. 

 car. in. Internal carotid artery. cl.II, Second gill cleft. Ec, Ectoderm. 



H, 



Ao.D, Descending aorta 



Anlage of cerebral, hemispheres. Jug, Jugular vein. L.gr, Lachrymal groove. L.V, Lateral ventricle 

 of brain. Mdb, Mandibular arch. .M;i;, Maxillary process. My, Myotome, nch, Notochord. N.cem.i, 

 First cervical nerve. N.y, Facial nerve. N.g, Glossopharyngeal nerve. N.io, Vagus nerve. N.iz, 

 Spinal accessory nerve. O.F, Oral fissure or space between the head and mandibles. Olf, Olfactory pit. 

 Ph, Pharynx. P. M, Pia mater. Sp.c, Spinal cord. X 22 diams. 



