soliify.blogg.se - Freely movable joints are called

These bristles are connected with muscles at their bases. The surface which is close to the base is called ventral surface. It has a large number of very small bristles on the ventral surface of the body. The lower jaw bone or mandible is the only movable bone which helps us to chew, eat and talk.Įarthworm: Earthworm has a segmented body. Facial bones: These bones make the front and the lower part of the skull.The joints of the cranial bones are fused joints. The bones of the cranium are flat and are held firmly in a Zipper- like manner. Cranium: The cranium gives protection to the brain.Skull: The skull is at the top of the vertebral column. The thigh bones are attached to the hip bone. Hip Bone or Pelvic Girdle: It is formed by the fusion of three bones, the hip bones and the tail parts of the backbone to from a large bony bowl. It is attached to the upper part of the rib-cage and to the upper arm bone. Shoulder bone or Pectoral Girdle: The shoulder bone is formed by the collar bone and the shoulder blade. It consists of 33 small rings called vertebrae which are joined from end-to-end. The rib-cage protects the lungs and the heart.īackbone or Vertebral Column: The vertebral column extends from the base of the skull to the hip. Various organs of the skeletal systemĬhest bone or Rib Cage: It forms a cone- shaped bony cage. Cartilage reduces friction between a joint. Cartilage is found between joints and in some elastic organs like ear lobe and nose. While the bones are hard, cartilages are soft. The human skeleton is made up of 206 bones.

The framework of bones and cartilage which gives shape and support to the body an animal is called skeleton. The wrist joint is also an example of gliding joint.

Joints between the rings of the backbone are examples of gliding joint.

Gliding joints: The movement in this joint happens due to sliding of bones over one another.

The knee joint and elbow joint are examples of hinge joint. This joint allows movement only in one plane and only up to 1800.

Hinge joint: This joint is similar to the hinges in a door.

The joint between the skull and the vertebral column is an example of pivot joint.

Pivot Joint: This type of joint allows movements in many planes, viz.

Similarly, the joint between thigh and hip is an example of ball and socket joint. The joints between shoulder and the upper arm is an example of ball and socket joint.

Ball and socket joint: In this joint the rounded end of one bone fits into the cavity (hollow space) of another bone.

There are four types of movable joints in the body which are as follows:

Moveable joint: Movement is possible in these joints.

The joints in the skull bone (cranium) are examples of fixed or immovable joints.

Fixed joints: The joints where no movement of bones is possible are called fixed joint.

The location where two or more bones meet is called a joint. In such cases, movement is possible along a point where two or more bones meet. Movement of some organs happens because of the teamwork of bones and muscles. Locomotion: When movement results in change of position of the whole organism, it is called locomotion. Many movements take place in our body and also in other organisms’ body. Movements: A change in the position of any object is called movement.