NERVOUS SYSTEM OF A TTWO-HEADED PIG EMBRYO 387 



Ifd., infundibuluin 



//. nervus opticus 



///, nervus oculomotorius 



Illr.fr.. root fibers of third nerve 



Infr., infraorbital nerve 



Inft., infratrochlear nerve 



I.o.m., inferior oblique muscle 



IV, nervus trochlearis 



IVr.fr., root fibers of fourth nerve 



IX, nervus glossopharyngeus 



Lal.r., lateral recess 



Lai.v., lateral ventricle 



Lg., lingual nerve 



It., left 



Lyg.cg., laryngeal cartilages 



m., muscle 



Aid. obi., medulla oblongata 



Mdr.n., mandibular nerve 



Mes., mesencephalon 



Met.md., metencephalic mound 



Mel. CO., conjoined metencephalon 



M.i.g., median isolated ganglion 



Mk.cg., Meckel's cartilage 



Mk.cg.co., conjoined (median) Meckel's 

 cartilages 



ML, malleus 



mo.nu.co., conjoined motor nucleus 



m.r.fr., motor root fibers 



M.rph., median raphe 



Ms.m., masseter muscle 



M.r.n., maxillary nerve 



n.fs., nasal fossa 



Nld., nasolacrymal duct 



Ns., nasal (nasociliary) nerve 



Nsp., nasopalatine nerve 



?/,(/., nucleus 



Olf.b., olfactory bulb 



Oph.n., ophthalmic nerve 



Or.c, oral cavity 



Ol.g., otic ganglion 



Ped.fr., peduncular fibers 



Peot.cg., periotic cartilage 



Pcof.cg.co., conjoined (median) periotic 

 cartilages 



Popt.r., preoptic recess 



Pr.gl., parotid gland 



R.c.nm., rostral cranial nerve-mass 



r.fr., root fibers 



rt., right 



rhmb. , rhombencephalon 



S.I., sulcus limitans 



S.lb., superior labial nerve 



Slg.gl., sublingual gland 



Smx.gl., submaxillary gland 



S.o.m., superior oblique muscle 



Sp.c, spinal cord 



Sp.cn., spinal canal 



Sp.g., spinal ganglion 



Spl.g., sphenopalatine ganglion 



Sp.n., spinal nerve 



Sp.n.co., conjoined (median) spinal 



nerves 

 Sp.n.rd., spinal neural ridge 

 s.r.fr., sensory root fibers 

 S.r.m,., superior rectus muscle 

 Stp., stapes 

 Sip. a., stapedial arterj- 



T.A., tongue of head A 



T.B., tongue of head B 



Tm.smxl.gl.co., conjoined terminals of 

 the median submaxillary and sub- 

 lingual glands 



Track., trachea 



Tr.sl., tractus solitarius 



Tr.sl.co., conjoined (median) tract i 

 solitarii 



Tr.sp., tractus spinalis trigemini 



Ts.sy., truncus sympatheticus 



Ts.sy.ac, accessory truncus sympa- 

 theticus 



Tt.md.obl., tip of tongue-like projec- 

 jection of the medulla oblongata 



V, nervus trigeminus 

 Vb.a., vertebral artery 



Vgg., conjoined (median) gasserian 

 ganglion 



VI, nervus abducens 



VII, nervus facialis 



VIIco., conjoined (median) VII nerve 



VIII, nervus acusticus 



Vm.r.fr., motor root fibers of V nerve 

 Vs.r.fr., sensory root fibers of V nerve 

 Vtr.III, third ventricle 

 Vtr.IV.co., conjoined fourth ventricles 

 Vtr. hit. quad., ventrolateral quadrant 

 V^' , uncertain branch of median V 



nerve 

 A', nervus vagus 



XI, nervus accessorius 



XII, nervus hypoglossus 

 Xm.nu.co., conjoined motor nuclei of 



median tenth nerves 



