Bilateral Relations Of Norway
Bilateral may refer to any concept including two sides, in particular: *Bilateria, bilateral animals *Bilateralism, the political and cultural relations between two states *Bilateral, occurring on both sides of an organism (Anatomical terms of location#Medial and lateral, Anatomical terms of location § Medial and lateral) *Bilateral symmetry, symmetry between two sides of an organism *Bilateral filter, an image processing algorithm *Amplifier#Unilateral_or_bilateral, Bilateral amplifier, a type of amplifier *Bilateral (album), ''Bilateral'' (album), an album by the band ''Leprous'' *Bilateral school, see Partially selective school (England) {{disambig ...
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Bilateria
The Bilateria or bilaterians are animals with bilateral symmetry as an embryo, i.e. having a left and a right side that are mirror images of each other. This also means they have a head and a tail (anterior-posterior axis) as well as a belly and a back (ventral-dorsal axis). Nearly all are bilaterally symmetrical as adults as well; the most notable exception is the echinoderms, which achieve secondary pentaradial symmetry as adults, but are bilaterally symmetrical during embryonic development. Most animals are bilaterians, excluding sponges, ctenophores, placozoans and cnidarians. For the most part, bilateral embryos are triploblastic, having three germ layers: endoderm, mesoderm, and ectoderm. Except for a few phyla (i.e. flatworms and gnathostomulids), bilaterians have complete digestive tracts with a separate mouth and anus. Some bilaterians lack body cavities (acoelomates, i.e. Platyhelminthes, Gastrotricha and Gnathostomulida), while others display primary body cavi ...
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