c internal gills 



d lungs and larynx 



c air-bladder 



8 Heart, \'ascular system and blood 

 a general subjects 



b heart 

 c;d arterial and venous system 

 e capiilarv system 

 f blood 



9 Coelomic cavities and endothelia, lympathic system and connective tissue 

 ab coelomic cavities and endothelia 



c lympathic tissue 

 d connective tissue 



10 Urogenital system and sexual differentiation 

 a general subjects 



be kidneys; nephric ducts and bladder 

 d,'e,f gonads (ovary and testis), genital tracts and accessory glands 

 g sexual differentiation 



11 Endocrine glands 

 a general subjects 

 b hypophysis 



c thymus 



d thyroid gland 



e parathyroid glands 



f gonads 



g adrenals 



h pancreas 



I. DESCRIPTIVE AND COMPAR.-KTIVE EMBRYOLOGY 

 SUBDIMSION 



1 Theoretical problems and general questions 



2 Methods and techniques 



3 General subjects (asexual development, reproduction, etc.) 



4 Initial development 

 a General subjects 



b Primordial germ cells 



c Gameto-. ovo- and spermatogenesis 



d Maturation 



e Ovulation and oviposition 



f Activation and fertilization 



g Parthenogenesis 



5 Clear age and mitosis 

 a Cleavage 



b Mitosis 



6 Further development o[ Invertebrates 



(including complete and partial — e.g. earlv — development) 

 PL Plants 

 EV Evertebrata 

 P Protista 



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