Bone is the fundamental unit of the human being skeletal system and gives the framework for and bears the load of the body, supports mechanical movement, protects the important organs, maintains iron homeostasis and hosts hematopoietic cells.
Bones can be classified according to their shape, position, structure and size. Depending on location, bones can be classified as follows:
Axial skeleton – Bones of the vertebral column, skull, ribs and sternum
Appendicular skeleton – Bones of the pelvis girdle, pectoral girdle and limbs
Acral skeleton – Part of the appendicular skeleton, which includes bones of the feet and hands
According to shape, bones could be classified as follows:
Flat bone – Bones of the sternum, skull, ribs and pelvis
Tubular bone –
Long tubular bone, such as bones of the limbs
Short tubular bone, which includes bones of the feet and hands, for example the metacarpals, phalanges and metatarsals
Irregular bone – Bones of the face and vertebral column
Sesamoid bone – Bones that develop in specific tendons, the biggest example of which is the patella
Accessory bone or supernumerary bone - Additional bones which develop in extra ossification centers or bones that did not fuse with the primary parts throughout development (Accessory bones are common in the foot and might be mistaken for bone chips or fractures.)
The human skeleton contains 206 bones. We are in fact born with more bones (about 300), however many fuse together being a child grows up. These bones help your body and enable you to move. Bones contain plenty of calcium (an element present in broccoli, milk and other foods). Bones make blood cells and store essential minerals.
The longest bone inside our bodies is the femur (thigh bone). The tiniest bone is the stirrup bone in the ear. Every hand has 26 bones inside it. Your ears and nose are not made from bone; they are made from cartilage, a flexible material that is not as hard as bone.
Joints: Bones are linked to other bones at joints. You can find many different kinds of joints, such as: hinged joints (such as in the fingers and toes), fixed joints (such as in the skull, which contains many bones) and ball-and-socket joints (such as the hips and shoulders).
Differences in females and males: Females and males have slightly various skeletons, such as a different elbow angle. Men have slightly thicker and longer arms and legs; females have a larger pelvis and a bigger space within the pelvis, via which children travel when they are born.
Human bones are categorized on various bases of classification. Usually four types of classifications are followed each separating bones into different types.
Types of bone on the basis of shape:
Types of bone on the basis of development:
Types of bone on the basis of region:
Bones of appendicular skeleton,
Bones of axial skeleton
Types of bone on the basis of structure:
According to Microscopic approach:
According to Macroscopic approach;