Tuesday, 7 April 2020

DISEASES OF SKELETAL SYSTEM - ARTICULATION OF BONES – THE JOINTS - BIOLOGY

DISEASES OF SKELETAL SYSTEM:

1. Gout:Accumulation of uric acid crystals in joints leading to painful movement.
2. Dislocation: In this case, the bones at the joints are dislodged from their positions e.g., the ball of one bone may slip out of the socket.
3. Hard tissue deposits over articular cartilage along with higher secretion of synovial fluid causing pain and stiffness lead to rheumatoid arthritis.
4. Tearing of articular cartilage nd development of bony lumps at places causing pain, stiffness and permanent bending lead to osteoarthritis.
5. Bursitis is inflammation of the bursae present within synovial joint as small membrane bound pockets which stores synovial fluid.
6. Osteitis is inflammation of bone.
7. Osteoporosis is loss of bone density due to excessive absorption of calcium and phosphorus from the bone.
8. Osteomyeliltis is infection of bone.
9. Osteopetrosisis a hereditary disease marked by abnormally dense bone, and by the common occurrence of fractures of affected bone.

ARTICULATION OF BONES – THE JOINTS

- A bone joint or articulation may be defined as the junction of two bones. The study of such joints is known as arthrology.

Note:
- Femur (in hind limbs) is the longest bone and stapes (in middle ear) is the smallest bone of the body. - Sternum is absent in fish.
- Fibulla – thinnest bone
- Osteology is study of skeleton.
- Chondrology is study of cartilages.
- Arthrology is study of joints.
- Masseters of jaw is the strongest muscle.
- Birds have spongy bones with air filled spaces, called pneumatic bones. 

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