frontal organ(s)

frontal organ(s)
Sensory cells on anterior surface of cephalon. (Syn. haft organ, frontal eye) [McLaughlin, 1980].
Sensory cells or setae on front surface of heads on some branchiopods, copepods, and decapods [Moore and McCormick, 1969].
(Order Cladocera):
General term for any of several similar sensory organs in head. The different positions of these frontal organs has led to an array of terms for the individual structures, including nuchal or neck organ and, in the older literature, dorsal and ventral frontal organs. All are innervated by brain and considered to represent reduced photosensitive organs [Stachowitsch, 1992].
(Order Notostraca):
Sensory organs adjoining nauplius eye [Stachowitsch, 1992].
(Order Diplostraca):
In certain clam shrimp, unpaired, pyriform projection on middorsal surface of head. (Syn. frontal appendage) [Stachowitsch, 1992].
(Order Anostraca):
pair of sensory organs adjoining nauplius eye on anterior end of head; innervated by brain. (Syn. ventral frontal organ, paired ventral frontal organ) [Stachowitsch, 1992].
(Subclass Mystacocarida):
One pf several sensory structures represented by setae of anteromedian lobes (rostral plate) of cephalon [Stachowitsch, 1992].
(Class Ostracoda):
Unpaired sensory structure located near eye on head; innervated by supraesphageal ganglion and typically developed as tentacle- or filement-like projection [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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  • frontal organ — (ARTHROPODA: Crustacea) a. Sensory cells on the anterior surface of the cephalon of malacostracans; the haft organ or frontal eye in non malacostracans. b. The Bellonci organ of ostracods; see organ of Bellonci, frontal eye complex, x organ …   Dictionary of invertebrate zoology

  • ventral frontal organ — Paired sensory structure associated with the nauplius eye of nonmalacostracan crustaceans [McLaughlin, 1980]. (Order Anostraca): Frontal organ [Stachowitsch, 1992] …   Crustacea glossary

  • organ of Bellonci — (ARTHROPODA: Crustacea) Receptors innervated from the medullae terminales of the brain, consisting of ciliated sensory neurons associated with supporting cells, such as glial, bordering and perilemmal cells; has also been called frontal organ, x… …   Dictionary of invertebrate zoology

  • frontal eye complex — (ARTHROPODA: Crustacea) The eyes or reduced eyes innervated from the nauplius eye center; see organ of Bellonci, frontal organ …   Dictionary of invertebrate zoology

  • frontal eye — see frontal organ …   Dictionary of invertebrate zoology

  • frontal appendage — One pair of filaments arising in many Anostraca from bases of antennae but independent of them; may be ramified [Moore and McCormick, 1969]. (Order Diplostraca): Frontal organ [Stachowitsch, 1992]. (Order Anostraca): Paired filaments arising from …   Crustacea glossary

  • frontal filament — (Subclass Copepoda): One of two slender projections extending from rostrum of freeliving copepod. With sensory function [Stachowitsch, 1992]. (Class Ostracoda): Frontal organ [Stachowitsch, 1992] …   Crustacea glossary

  • ventral frontal organ — (ARTHROPODA: Crustacea) Paired sensory structures associated with the nauplius eye …   Dictionary of invertebrate zoology

  • frontal band — Glandular organ of adhesion in frontal region of various parasitic copepods serving for attachment to host fishes [Moore and McCormick, 1969]. Glandular organ of adhesion in frontal region of various parasitic copepods used for attachment to host …   Crustacea glossary

  • frontal — 1. In front; relating to the anterior part of a body. 2. Referring to the f. (coronal) plane or to the f. bone or forehead. SYN: frontalis [TA]. * * * fron·tal frənt əl adj …   Medical dictionary

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