- Suture (anatomical)
anatomy, a suture is a fairly rigid joint between two or more hard elements of an animal, without significant overlap. Sutures are found in a wide range of animals, from the Cambrianperiod to the present day. Hence they are formed by several methods and between hard parts made of various materials.
These are made of
bone, in which the main rigid ingredient is calcium phosphate.
The crania (brain cases) of most
vertebratesconsist of sets of bony plates held together by cranial sutures. These sutures are held together mainly by Sharpey's fiberswhich grow from each bone into the adjoining one.
utures in ankles of land vertebrates
crurotarsalankle. The astragalus(pink) is fixed to the tibia(green) by a suture. Adapted with permission from [http://www.palaeos.com/Vertebrates/Units/270Archosauromorpha/270.500.html Palaeos] ] In the type of crurotarsalankle which is found in crocodiliansand some other archosaurs, the astragalusis fixed to the tibiaby a suture and the joint bends around a peg on the astragalus which fits into a socket in the calcaneum. [ [http://www.palaeos.com/Vertebrates/Units/270Archosauromorpha/270.500.html Archosauromorpha: Archosauria - Palaeos] ]
utures in the shells of
cephalopod molluskswhich have external shells (e.g. " Nautilus", ammonites), the shell is divided into compartments by septa ("partitions"). The septa are joined to the external shell by sutures formed by "repeated invagination" (they interlock like pieces of a jigsaw puzzle). The sutures are visible from the outside and often form complex and elaborate patterns. [ [http://www.palaeos.com/Invertebrates/Molluscs/Cyrtosoma/Cephalopoda/Cephalopoda.Glossary.html#suture Cephalopoda Glossary - Palaeos] ] The shells of mollusks are mainly made of calcium carbonate(which is also the main constituent of limestoneand chalk).
Nearly all snails consist, in effect, of a tube of increasing diameter, closed at the small end, and spirally wrapped around a central axis.
Each complete rotation of this spirally-arranged tube is called a whorl. The whorls of a snail shell usually overlap one another forming a spire. Where the whorls overlap, there is usually a clear indentation. This indentation forms a visible line which reaches from the apex to the
body whorl; this line is the suture.
Details of the suture are often useful in discriminating one species from another. The suture also provides a sort of geographic marker from which one can refer to the positioning of patterning or sculpture where that is relevant: for example some species have a darker or lighter subsutural band on the shell.
utures in the carapaces of trilobites
trilobiteshad sutures which divided the cephalon (head section) into 3 pieces. The sutures in trilobites' cephalons were unusual because it seems their main function was to create "weaknesses" which made it easy for this part of the carapace("armor") to split when the animal needed to molt. A trilobite's carapace consisted of calciteand calcium phosphatedeposited on a lattice (framework) of chitin(a complex sugar). [ cite book | author=Fortey, R.A. | title=Trilobite! | publisher=Knopf | date=2000]
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