See also: Skeleton (homonymy)

The skeleton is a frame Animal E rigid being used as support for the Muscle S. It appeared following the need for a pluricellular organization to protect its Organe S and to keep a certain form in spite of the force exerted by terrestrial gravity.

The skeleton forms, with the muscular Système and part of the Nervous system, the locomotor Appareil.

Endosquelette

See also: Endosquelette

The endosquelette is an internal skeleton at the organization. It is mainly present at the vertebrate ones, like the Homme. At the man, it is composed of 206 bones.

Exosquelette

See also: Exosquelette

A exosquelette is the reverse of the endosquelette. This time the rigid structure of the organization is in direct contact with the environment. The carapace of the Insect S and the tortoise S is a exosquelette.

Composition

This frame can be, Os seuse or cartilagineuse for the Vertébré S.

In certain animals Invertebrate S having a soft body, like the Octopus, the skeleton is composed of a cavity filled with a Liquide, it is the hydrostatic Squelette.

Structure

In the case of an osseous skeleton, it is composed of bones connected, to the articulations, by Ligament S. the muscles are connected to the bones by the Tendons.

It is rudimentary and reduced to a notocorde at the Embryon S and at some adult forms, of a spinal column and head at some Reptile S and Poisson S, it becomes complicated, at the majority of the Vertébré S, by the addition of appendices, the members.

See too

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