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Skeletal system: Difference between revisions
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== Endoskeleton == | == Endoskeleton == | ||
In vertebrates, the endoskeleton is sturdy internal frame that is centered on a prominent spine (vertebral column). Most skeletal systems consists of [[bones]], [[cartilage]], [[ligaments]] and [[tendons]] and accounts for of the body weight (about 20 percent in humans). The living bones use [[oxygen]] and give off waste products in [[metabolism]]. They contain active tissues that consume [[nutrients]], require a [[blood]] supply and change shape or remodel in response to variations in mechanical stress. | |||
=== Main Groups === | === Main Groups === | ||
Bones can be grouped in two divisions: axial skeleton and appendicular skeleton. The axial skeleton forms the vertical axis of the body. They include the bones of the head, vertebral column, ribs and breastbone or sternum. The appendicular skeleton includes the free appendages and their attachments to the axial skeleton. The free appendages are the upper and lower extremities, or limbs, and their attachments which are called girdles.[http://training.seer.cancer.gov/module_anatomy/unit3_5_skeleton_divisions.html] | Bones can be grouped in two divisions: axial skeleton and appendicular skeleton. The axial skeleton forms the vertical axis of the body. They include the bones of the head, vertebral column, ribs and breastbone or sternum. The appendicular skeleton includes the free appendages and their attachments to the axial skeleton. The free appendages are the upper and lower extremities, or limbs, and their attachments which are called girdles.[http://training.seer.cancer.gov/module_anatomy/unit3_5_skeleton_divisions.html] | ||
