skeletal system
TRANSCRIPT
Skeletal System
Skeletal SystemSkeletal System
The skeletal system is a rigid framework of bones that serves many important functions. It provides support, shape and strength to the body, protects the internal organs and also
helps in the movement of body parts. There are 206 bones in an adult human body.
Skeletal SystemSkeletal System
The skeletal system comprises of the skull, backbone, rib cage and limbs.
SkullSkeletal System
The skull is the bony framework of the head. It protects the brain.The skull consists of 8 cranial and 14 facial bones thus making a total of 22 bones.
SkullSkeletal System
The cranial bones make up a protective frame around the brain. The facial bones make the upper and lower jaws, and other facial features.
SkullSkeletal System
Except the lower jaw, all other bones in the skull are fixed and hence, immovable. We are able to talk and eat because of the movable lower jaw.
BackboneSkeletal System
The backbone is also known as the vertebral column or the spine. It consists of 33 irregularly shared bones called the vertebrae.
BackboneSkeletal System
Vertebrae make a strong framework which protects the spinal cord.The vertebral column enables us to stand upright and maintain our balance.
Rib CageSkeletal System
Ribs are thin, flat and curved bones. They form a protective cage around the heart and the lungs called the rib cage. The rib cage consists of 24 bones arranged
in 12 pairs of ribs.
Rib CageSkeletal System
The ribs are joined to the breastbone or the sternum in the front and to the backbone at the back. Apart from protecting the heart and the lungs, the ribs protect parts of
the stomach, spleen and kidneys.
LimbsSkeletal System
The human body has two pairs of limbs – the forelimbs or the arms and the hindlimbs or the legs. The thigh bone, known as femur is the longest bone in the body.
JointsSkeletal System
The places where two or more bones meet to join together are called joints. The bones are held together at the joints by strong tissues called ligaments. Most of the
joints are movable except the joints in the tooth socket and in the skull.
JointsSkeletal System
There are four types of movable joints – the hinge joint, the ball and socket joint, the pivot joint and the gliding joint.
Hinge JointSkeletal System
Hinge joint allows movement in one direction only, similar to the hinges of a door. Bones in the elbow, knee, toes and fingers have hinge joints.
Ball & Socket JointSkeletal System
In the ball and socket joint, the ball-like end of one bone fits into a cup-like (socket) of the other bone. It allows movement in all directions.
Shoulder and hip joints are of this type.
Pivot JointSkeletal System
Pivot joint allows rotation only. In this joint, the rounded surface of one bone fits into a ring formed by the other bone. Joint between neck and the head is a pivot joint.
Gliding JointSkeletal System
Gliding joint allows the bones to glide over each other.Bones of the wrist and the ankle have gliding joints.
This presentation is a result of my experiences while I was helping out my son with his school assignments and project work. I am happy to share this with other students and their parents. Hope you find this informative and useful. Thank you.
- Prashant Mahajan -
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