Bones & its types By,M. Thiru murugan Define Bones & write its types Bones: Bone are specialized forms of strong connective tissue that forms the skeleton of the body. It is composed of calcium phosphate and calcium carbonate. It also serves as a storage area for calcium The smallest bone in the human body is called the stirrup or stapes bone, located deep inside the ear & The longest bone & strongest bone in the human is called the femur. Classification or types of bones: Bones are divided into 5 types. Long Bone Short Bone Flat Bone Irregular Bone Sesamoid Bone 1. Long Bone: A long bone is one that is cylindrical in shape, being longer than it is wide. Shape of a bone, not its size. Long bones are found in: Arms (humerus, ulna, radius) & fingers (metacarpals, phalanges) and also Legs (femur, tibia, fibula), and toes (metatarsals, phalanges). Long bones function as levers; they move when muscles contract. 2. Short bones: cube-like in shape, equal in length, width, and thickness. Example: Carpals of the wrists & Tarsals of the ankles. Short bones provide stability and support as well as some limited motion. 3. Flat Bones: The term “flat bone” is somewhat of a misnomer because, although a flat bone is typically thin, it is also often curved. Examples include the cranial bones, the scapulae, the sternum, and the ribs. Flat bones serve as points of attachment for muscles and often protect internal organs. 4. Irregular Bones: An irregular bone is one that does not have any easily characterized shape and therefore does not fit any other classification. These bones tend to have more complex shapes, like the vertebrae, Many facial bones, particularly the ones containing sinuses. 5. Sesamoid Bones: A sesamoid bone is a small, round bone that, as the name suggests, is shaped like a sesame seed. These bones form in tendons where a great deal of pressure is generated in a joint. The sesamoid bones protect tendons by helping them overcome compressive forces. Sesamoid bones vary in number and placement from person to person but are typically found in tendons associated with the feet, hands, and knees. The patellae (singular = patella) are the only sesamoid bones found in common with every person.

1. Bones & its types

2. • Define Bones & write its types
• Bones:
• Bone are specialized forms of strong connective tissue that
forms the skeleton of the body.
• It is composed of calcium phosphate and calcium
carbonate.
• It also serves as a storage area for calcium
• The smallest bone in the human body is called the stirrup
or stapes bone, located deep inside the ear & The longest
bone & strongest bone in the human is called the femur.

3. • Classification or types of bones:
• Bones are divided into 5 types.
1. Long Bone
2. Short Bone
3. Flat Bone
4. Irregular Bone
5. Sesamoid Bone

4. 1. Long Bone:
• A long bone is one that is cylindrical in shape, being longer than it is
wide.
• Shape of a bone, not its size.
• Long bones are found in: Arms (humerus, ulna, radius) & fingers
(metacarpals, phalanges) and also Legs (femur, tibia, fibula), and toes
(metatarsals, phalanges).
• Long bones function as levers; they move when muscles contract.
2. Short bones:
• cube-like in shape, equal in length, width, and thickness.
• Example: Carpals of the wrists & Tarsals of the ankles.
• Short bones provide stability and support as well as some limited motion.

5. 3. Flat Bones:
• The term “flat bone” is somewhat of a misnomer because, although a
flat bone is typically thin, it is also often curved.
• Examples include the cranial bones, the scapulae, the sternum, and the
ribs.
• Flat bones serve as points of attachment for muscles and often protect
internal organs.
4. Irregular Bones:
• An irregular bone is one that does not have any easily characterized
shape and therefore does not fit any other classification.
• These bones tend to have more complex shapes, like the vertebrae,
Many facial bones, particularly the ones containing sinuses.

6. 5. Sesamoid Bones:
• A sesamoid bone is a small, round bone that, as the name suggests, is
shaped like a sesame seed.
• These bones form in tendons where a great deal of pressure is
generated in a joint.
• The sesamoid bones protect tendons by helping them overcome
compressive forces.
• Sesamoid bones vary in number and placement from person to person
but are typically found in tendons associated with the feet, hands, and
knees.
• The patellae (singular = patella) are the only sesamoid bones found in
common with every person.