The Muscle Cells of the Follicle of the Ovotestis in Aplysia as the Probable Target Organ for Bag Cell Extract

It has recently been demonstrated that activity of the bag cellsan identified gioup of neurosecretory neurons in Aplysia, leleasesa substance that causes egg laying. A cytologic analysis ofthe ovotestis, before and after administration of the bag cellextract, suggests that one function of the bag cell substanceis to cause the small muscle cells that surround each follicleof the ovotestis to contract, thus expelling ripe oocytes fromthe ovotestis ind beginning them on then journey through theoviduet