Universlty of Manitoba, ln Partîal Fulfiìlment - MSpace at the ...

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overl îes three accessory canals at the rhomboid sinus. Establ ished myeloschlsls
(42E 8,f 19. 99) is assocîated with eversion of neural materîal
at the upper and lower ends of the leslon, separat¡on of neural sources
wîth progresslve reduction of neural plate materlal, and separation of
notochord from neural tÌssue at the cranial end of tbe leslon.
ln hemlmyel¡a (30E 76 ,428 50,Fl9s. lot s 102)the open defecrs extend
cranlally up from the ta¡l bud; there is no sign of an overlap zone
comparable to the control embryo (3OC ZZ,flg.100 ) showing accessory
canals and a fully closed neural plate. The cross-sectlonal area of
':
neural tîssue is reduced ln hemìmyel la and there is no separation
of neural tissue from notochord.