One of a pair of sensory structures which grow from the head of an invertebrate animal. Antennae may be long and filiform as in cockroaches, feathery as in male moths, or club-shaped as in some Diptera. The antenna is richly supplied with nerves and is covered with a battery of sense organs, including various types of mechanoreceptors and chemoreceptors. The antenna is a dead-end space, but haemolymph is circulated through it by means of a pump or heart.
Subjects: Zoology and Animal Sciences.