Question

Which of the following joints is immovable?

• A. Shoulder and arm
• B. Knee and joint
• C. Upper jaw and skull
• D. lower jaw and upper jaw

Answer 1

The correct option is C

Upper jaw and skull

The correct option is C.

Explanation of correct option:

1. The 22 bones that make up the skull are regarded as immovable joints.
2. Its limited mobility is caused by the inflexible fibrous joints that make up its body.
3. The sutures, or immovable joints, are what give the skull its immovability.
4. The upper jaw is also immobile because it continues to be joined to the skull via an immovable joint.

Explanation of incorrect options:

Option A:

The joint between the shoulder and arm is the ball and socket joint which is freely movable.

Option B:

The knee joint is also known as the synovial joint which is movable.

Option D:

The joint between both the jaws is the mandibular joint which helps in chewing and is movable.

Final answer: Upper jaw and skull are immovable joints.