Nodding the head to indicate 'YAS' involves movement in the joint/type of joint, which is also seen in the

Options

A. carpal-metacarpal joint
B. atlanto-axial joint
C. inter-carpal joint
D. radius and ulna joint

Answer

To answer the question about the type of joint involved in nodding the head to indicate 'yes', we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Movement**: Nodding the head to indicate 'yes' involves moving the head up and down. This movement is primarily facilitated by the neck.

2. **Determine the Joint Involved**: The joint responsible for this movement is the atlanto-occipital joint, which is located between the atlas (the first cervical vertebra) and the occipital bone of the skull.

3. **Classify the Joint Type**: The atlanto-occipital joint is classified as a synovial joint. Synovial joints are characterized by a fluid-filled cavity that allows for a wide range of motion.

4. **Examine the Options**: The options provided are:
- A) Carpal metacarpal joint
- B) Atlanto-axial joint
- C) Inter-carpal joint
- D) Radius and ulna joint

5. **Analyze Each Option**:
- **Carpal Metacarpal Joint**: This is a saddle joint, which allows for a different type of movement (grasping).
- **Atlanto-Axial Joint**: This joint allows for rotation of the head, but it is not the joint involved in nodding 'yes'.
- **Inter-carpal Joint**: These are joints between the carpal bones and allow for limited movement.
- **Radius and Ulna Joint**: This joint allows for rotation of the forearm, not head movement.

6. **Select the Correct Answer**: The correct answer is the **Carpal Metacarpal Joint** (Option A), as it is a type of synovial joint that allows for movement similar to nodding the head.

### Final Answer:
The joint/type of joint involved in nodding the head to indicate 'yes' is the **Carpal Metacarpal Joint**.

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