Shellfish Breeding and Hatchery Management (2+1)

2.1.2 X-organ

This is a specialised neurosecretory organ located in both the eye stalks.  The cluster of neurosecretory neurons (X-organ) are  located in the medulla terminalis. The axons of these secretory neurons and  neurohaemal organ are together called sinus gland, which serves as a storage – release centre for these hormones. As the sinus gland serves for the storage and release of neurohormones secreted by secretary neurons of x-organ it is called “X- organ-sinus-gland complex”.