Question

In humans, the joint between the bones of skull is
a. Fibrous joint
b. Hinge joint
c. Synovial joint
d. None of the above

Answer 1

Hint: In humans, joints are classified into many types, and they are divided based on function, structure, etc. The function of the majority of the joints in humans is movement.

Complete answer:
Joints are classified based on many things
- When coming to functional classification, they are classified as follows.
- If the joints are completely immovable, they are considered as a synarthrosis.
- If the joints are partially movable then they are called amphiarthrosis.
- Completely movable joints are called diarthrosis.
- According to the structure, joints are classified into three types mainly.
- They are fibrous, cartilaginous, and synovial.

> Fibrous joints: In this type of joints, bones are bound together by the dense fibrous tissue and these fibrous joints are again are of 3 types, they are:
   - Sutures: They are immovable joints, usually found in the flat bones of the skull.
   - Ghomposes: They are also immovable, in this teeth articulate with sockets is the example.
   - Syndesmosis: These are slightly movable which are again held by an interosseous membrane.

> Cartilaginous joints: In this type, bones are bound together by the cartilage, it may be hyaline or fibrocartilage, this is again mainly two types:
   - Synchondroses: In this type of joint, the bones are held together by the hyaline cartilage and the example is epiphysis and diaphysis of the long bones.
   - Symphysis: In this type, bones are bound together by fibrocartilage and the example is pubic symphysis.

> Synovial joints: This joint contains fluid-filled joint cavity and fibrous capsule and it is commonly found and freely movable. They are again sub-classified into many types namely:
   - Hinge joint: elbow, knee, and ankle joint.
   - Saddle joint: carpometacarpal joints.
   - Plane joint: acromioclavicular and subtalar joints.
   - Condyloid joint: wrist, metacarpophalangeal, metatarsophalangeal.
   - Ball and socket joint: Hip joint, shoulder joint.

Hence, The correct answer is option (A).

Note: Any damage to the cartilage or to the bone and muscle which support the joint may lead to damage and dislocation of joints, and osteoarthritis and swimming is the best physical activity that one can do which won’t cause or which cause very minimal damage to the joints.