Prothoracic Glands

Definition

Endocrine glands found in the thorax and secreting molting hormone (ecdysone) or a closely related ecdysteroid. They are activated by PTTH (prothoracicotropic hormone) during the immature stage and degenerate during or soon after metamorphosis.

Etymology

From the Greek 'prothorax', meaning 'forethorax', and 'glandula' meaning 'glands'.

Example

The prothoracic glands of a butterfly release ecdysone, which triggers molting.

Related Terms

• Ecdysone
• Molting
• PTTH