A gland lying above the hemispheres (h) of the brain of the larval Drosophila. Its lateral extremities encircle the aorta (a) like a ring, hence its name. The gland contains three endocrine tissues: the corpus allatum (ca), the prothoracic gland (pg), and the corpus cardiacum (cc). The diagrams here show the ring gland viewed from the side (A) and from above (B). Other symbols are as follows: n1 = afferent nerve to the corpus cardiacum from the brain; n2 = efferent nerve from the corpus cardiacum; n3 = nerve from corpus cardiacum to the corpus allatum; o = oesophagus; vg = ventral ganglion. See allatum hormones, ecdysone.
Subjects: Genetics and Genomics.