sternacosta n. [Gr. sternon, chest; L. costa, rib] (ARTHRO: In-secta) An internal transverse ridge connecting the bases of the sternal apophyses.
sternacostal suture (ARTHRO: Insecta) The external suture of the thoracic sternum through the apophyseal pits separating the basisternum from the sternellum.
sternal a. [Gr. sternon, chest] (ARTHRO: Insecta) Pertaining to the sternum.
sternal apophyseal pits (ARTHRO: Insecta) In higher insects, an external indentation marking the point of origin of the sternal apophysis.
sternal apophysis (ARTHRO: Insecta) One of a pair of lateral apodemal arms of the eusternum marked by pits joined by a sulcus, thus dividing the eusternum into a basisternum and a sternellum; in higher insects they arise in the midline and separate internally, forming the Y-shaped furca. see pleural apophysis.
sternal canal (ARTHRO: Crustacea) In Decapoda, an internal skeletal structure of some crabs formed by the meeting of the sternal apodemes from opposite sides of the body above the nerve cord; sternum canal.
sternal coxal process (ARTHRO: Insecta) 1. A projection of the sternum serving for the ventral point of articulation with the coxa. 2. In Culicidae, a winglike expansion of the meso- and metabasisterna; ventral process.
sternal laterale (ARTHRO: Insecta) A plate on each side of the sternum or presternum in some lower insects.
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