The Human Skeleton | Class VI

Human skeleton consists of 206 bones. It is divided into the followings parts;

Skull:

  • This is the uppermost part of the skeleton which forms the framework of our face and head.
  • It protects our brain from injury.
  • It made up of many small bones and all bones in the skull are fixed except of The Lower Jaw.
  • The movable lower jaw allows us to speak and chew   food.
  •  Ribcage:
  • It is a set of bones that enclose the heart and lungs and it present in the front part of our body below the neck.
  • It is made up of small strips of bones called ribs.
  • A long bone at the center of the chest is called sternum.
  • It holds the ribs in the front.
  • It is also attached to the backbone.
  • The last two pairs of ribs are not attached to the sternum, they are called floating ribs.
  • It's movements help in breathing.
  • It protects the heart and lungs from any injury
  • Backbone:​
  • It is made up of smaller bones called vertebrae arranged in a chain.
  • It is also known as the vertebral column.
  • There are normally 33 vertebrae in it..
  • Bending would not have been possible if it would have been made of a single long bone, instead of vertebrae.
  • The ribs are attached to the backbone.
  • The backbone gives support to the body.
  • Girdle:
  • Shoulder Girdle:
  • It also known as the pectoral girdle, it consists of the shoulder bone and the collarbone.
  • The shoulder girdle supports the bones of the arm.
  • The collarbone is a delicate bone.
    Hip Girdle:
  • Also known as the pelvic girdle, it consists of hip bones.
  • The pelvic girdle supports the bones of the leg.
  • Bones of the Upper Limb
  • Our arm consists of one long bone called humerus which is attached to the shoulder.
  • Two bones below the elbow are radius and ulna.
  • A group of small bones in the wrist, hand and fingers are carpals and metacarpals.
  • All the bones help us in gripping, holding and writing.
  • ​Bones of th lower limbe:
  • Our leg has one long bone above the knee called femur.
  • It is the longest bone in the body.
  • Two bones below the knee are tibia and fibula.
  • A group of small bones in the ankle, foot and toes are tarsals and metatarsals.
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