1. School:-Mother Mary’s
Skeletal system
Presented by:-
Soumya Gupta
Class:-V-A
School:-Mother Mary’s
School, Mayur
Vihar Phase-I,
Delhi

2. What is a bone?
The skeletal system is made up of the bones and cartilage that
forms the framework of your body.
We have bones so that we are not a puddle of skin and guts on the
floor.
Babies have 300 bones.
Adults have 206 bones.

3. The inside of the bone A bone is made up of salts, water, and tissue.
Inside a bone there is a jelly
substance called bone marrow.
Bone marrow produces blood
cells for the body.

4. Different parts of human skeleton
Skull:-The skull protects the brain .The skull of an adult human being generally contains 22 bones.
All bones in the skull are fixed, except the lower jaw. The movable lower jaw enables us to talk and eat. The upper and the lower jaws have teeth.

5. Rib cage Ribs are thin and curved bones that form
a cage in the chest, called the rib cage.
The rib cage protects our heart and
lungs. .Most people have 12 pairs of
ribs. .A long bone at the centre of the
chest called sternum, holds the ribs from the
front.
The ribs are also attached to the backbone at the
back. Last two pairs of ribs are not attached to
the sternum are called floating ribs.

6. Back bone The backbone protects the spinal cord. It is made up of
33 small bones called
vertebrae. The backbone is
called the vertebral column.

7. LIMBS contd.
Upper Limbs:-The upper limbs have two parts.The upper arm is made up of a single bone, called the humerus .It is joined at the elbow to a pair of bones that form the lower arm. A number of smaller bones form the hand , which is attached to the lower arm.

8. limbs
Lower Limbs:-The lower limbs have two parts.The upper leg is made up of a single bone called the femur, or the thigh bone. It is the longest bone in the human body. The lower leg is made up of two bones that join the femur at the knee.The feet are made up of a number of smaller bones.

9. Girdles contd. Girdles are ring-like bony structures connecting the
skull and vertebral column to
the upper and the lower
limbs.
Types of girdles:- The
shoulder girdle & the hip
girdle.

10. Girdles
The shoulder girdles connects the upper limbs to the body. It is made up of the collar bone and the shoulder blade .
The hip girdles connects the lower limbs to the body.

11. FUNCTIONS OF skeletal system
To protect our body and give
it shape.
To protect our internal organs.
To provide a scaffolding for
our muscles, allowing you to
move.
To store minerals until they are needed
by the body.
Produced blood cells in the bone
marrow.

12. joints
A joint is a place where two or more bones meet. Bones are held together at the joint by special tissues called ligaments. A tough, elastic called cartilage is also present on the surface of bones, at the joints.

13. Types of moveable joints
Ball and Socket Joint:-It allows movement in many directions.The shoulder joint and hip joint are examples of ball and socket joint.
Hinge Joint:-It allows back and forth movement.. It works like the hinges of the door. Bones in the knee, elbow, fingers, and toes have this type of a joint.
Pivot Joint:-It allows you to move your head up, down, and sideways. It is found between the head and the first vertebra of your backbone .
Gliding Joint:-It allows the bones to slide against each other in a gliding motion. It is found between the bones of wrist and ankle.

14. Cartilage and muscles
In addition to bones, cartilage and muscles also help us in movement.
Cartilage:-It holds the bone together at the joints.Without cartilage, the bones would rub against each other and wear out.Ex:-Nose & Ears have cartilage.
Muscles:-Muscles are tissues that covers the bones.They are attached to the bones with the help of special tissues called tendons.

15. Thank you