Insects display a wide variety of antennal shapes.

Antennae (singular antenna) are paired appendages connected to the front-most segments of arthropods. In crustaceans, they are biramous and present on the first two segments of the head, with the smaller pair known as antennules. All other arthropod groups, except chelicerates and proturans which have none, have a single, uniramous pair of antennae. Image File history File links Download high resolution version (300x1800, 391 KB) Photos of various w:insect w:antennae, combined into a single image to show some of the variety. ... Image File history File links Download high resolution version (300x1800, 391 KB) Photos of various w:insect w:antennae, combined into a single image to show some of the variety. ... Classes & Orders Subclass:Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass:Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Diaphanopterodea - extinct Protodonata - extinct Odonata (dragonflies and damselflies) Infraclass: Neoptera Superorder: Exopterygota Orders Caloneroptera - extinct Titanoptera - extinct Protorthoptera - extinct Grylloblattodea (ice-crawlers) Mantophasmatodea (gladiators) Plecoptera... An appendage is, in general, an external body part that projects from the body, or a natural prolongation or projection from a part of any organism. ... Morphogenesis (from the Greek morphê shape and genesis creation) is one of three fundamental aspects of developmental biology along with the control of cell growth and cellular differentiation. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Classes Class Branchiopoda Subclass Phyllopoda Subclass Sarsostraca Class Remipedia Order Enantiopoda Order Nectiopoda Class Cephalocarida Order Brachypoda Class Maxillopoda Subclass Mystacocarida Subclass Copepoda Subclass Branchiura Subclass Pentastomida Subclass Tantulocarida Subclass Thecostraca Infraclass Cirripedia Class Ostracoda Order Metacopina Subclass Myodocopa Subclass Podocopa Class Malacostraca Subclass Eumalacostraca Subclass Hoplocarida Subclass Phyllocarida The... Biramous is a term used for branched arthropod appendages. ... Classes Arachnida - spiders, scorpions, etc. ... Families Acerentomidae Eosentomidae Protentomidae Proturans (Order Protura) are one of the three hexapod groups that are no longer considered insects (along with Collembola and Diplura). ... The limb of an arthropod is said to be uniramous when it has only one branch. ...

Antennae are jointed, and generally extend forward from the head. They are sensory organs, although the exact nature of what they sense and how they sense it is not always clear. It appears that their function may include sensing touch, air motion, heat, vibration (sound), and olfaction (smell or taste). (See also sense) A sensory system is a part of the nervous system that consists of sensory receptors, neural pathways, and those parts of the brain responsible for processing the information. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Olfaction, the sense of odor (smell), is the detection of chemicals dissolved in air (or, by animals that breathe water, in water). ...

In insects, olfactory receptors on the antennae bind to odour molecules, including pheromones. The neurones that possess these receptors signal this binding by sending action potentials down their axons to the antennal lobe in the brain. From there, neurons in the antennal lobes connect to mushroom bodies that identify the odour. Classes & Orders Subclass:Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass:Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Diaphanopterodea - extinct Protodonata - extinct Odonata (dragonflies and damselflies) Infraclass: Neoptera Superorder: Exopterygota Orders Caloneroptera - extinct Titanoptera - extinct Protorthoptera - extinct Grylloblattodea (ice-crawlers) Mantophasmatodea (gladiators) Plecoptera... Olfactory receptors are a type of G protein-coupled receptor in olfactory receptor neurons. ... JUNIOR Odor receptors on the antennae of a Luna moth An odor (American English) or odour (Commonwealth English) is the object of perception of the sense of olfaction. ... It has been suggested that Bombykol be merged into this article or section. ... Drawing by Santiago Ramón y Cajal of cells in the pigeon cerebellum. ... A. A schematic view of an idealized action potential illustrates its various phases as the action potential passes a point on a cell membrane. ... An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neurons cell body or soma. ... Antennal Lobe is the deutocerebral neuropil of the insect which receive the input from the sensory neurons on the antenna. ... Comparative brain sizes In animals, the brain, or encephalon (Greek for in the head), acts as the control center of the central nervous system. ... The mushroom bodies or corpora pedunculata are a pair of structures in the brain of insects and other arthropods. ...

The three basic segments of insect antennae are the scape (base), the pedicel (stem), and finally the flagellum, which comprises many units known as flagellomeres.