Human skeleton consists of 206 separate bones joined
together by various joints. Size and appearance of various bones is determined by
the anatomical function. The largest bone is the femur, with 50 centimeters and the
smallest is the stapes (2.6 mm).
Bones can be divided into
four main groups:
-long bones or cylindrical bones,
they are elongated, slightly curved, they are designed to absorb shocks. In in this
category enter leg bones, arm, fingers.
- short bones,
(cubic) are rugged, thick: carpal and tarsus bones.
-
irregular bones, that have different shapes and sizes, forming parts of the face and
back.
- flat bones, ribs, skull, shoulder- they are shields
of vital organs.
Human spine consists of 26 separate bones:
vertebrae, they are joined by joints. The easiest joints are those in which an articular
surface is sliding over another.
Human head consists of 29
bones. Neurocranium is composed of well-welded eight bones knit which are protecting the
brain from external actions. Other 14 bone form the face (visceral skull ) in both ears
there three hearing small ossicles, incus, malleus and stapes, and the last bone is the
mandible.
Bones that form the thorax are 25. On the two
sides are aligned, one below another, 12 pairs of long, curved ribs, and sternum is
situated in the center.
Bones of scapular belt, the arm,
forearm and hand are in number of 64 bones.
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