Circumesophageal connective 



Antennule 

 Antenna 



stomach 



Ophthalmic 



artery 



Antennary 

 artery 



Testis 

 Ostium 



Pericardial 

 sinus 



First abdominal appendage 

 (for sperm transfer) 



Flexor muscle 

 Extensor muscle 



Abdominal ganglion 



Uropod 

 Anus 



Telson 



Ventral nerve cord 



Dorsal abdominal artery 

 ,^ Ventral abdominal artery 



202 



Figure 114. Internal structure of a male crayfish, 



