Which of the following joints enable the palm to turn anteriorly and posteriorly is

Options

A. Ball and socket joint between scapula and humerus
B. Saddle joint between the carpal and metacarpal of the thumb
C. Hinge joint between the capitulum of the humerus and the head of the radius
D. Pivot joint between the head of the radius and the radial notch of the ulna

Answer

To solve the question "Which of the following joints enables the palm to turn anteriorly and posteriorly?", we will analyze each of the given options step by step.

### Step 1: Understand the Question
The question is asking about the type of joint that allows the palm to rotate in two directions: anteriorly (facing up) and posteriorly (facing down).

**Hint:** Identify the movements of the palm and the joints involved in those movements.

### Step 2: Analyze Option A
**Option A:** Ball and socket joint between scapula and humerus.
- This joint is located in the shoulder and allows for a wide range of movement, including rotation, but it is not specifically responsible for the rotation of the palm.
- **Conclusion:** This option is incorrect.

**Hint:** Consider the location of the joint and its primary functions.

### Step 3: Analyze Option B
**Option B:** Saddle joint between the carpal and metacarpal of the thumb.
- The saddle joint allows for some movement, but it primarily facilitates opposition and reposition of the thumb rather than rotation of the palm.
- **Conclusion:** This option is also incorrect.

**Hint:** Think about the specific movements allowed by this type of joint.

### Step 4: Analyze Option C
**Option C:** Hinge joint between the capitulum of humerus and the head of radius.
- The hinge joint primarily allows for flexion and extension, not rotation. This joint is involved in the elbow's movement.
- **Conclusion:** This option is incorrect.

**Hint:** Recall the primary movements associated with hinge joints.

### Step 5: Analyze Option D
**Option D:** Pivot joint between the head of radius and the radial notch of ulna.
- The pivot joint allows for rotational movement. In this case, it enables the radius to rotate around the ulna, which allows the palm to turn anteriorly and posteriorly.
- **Conclusion:** This option is correct.

**Hint:** Identify the specific type of joint that allows for rotation.

### Final Answer
The correct answer is **Option D: Pivot joint between the head of radius and the radial notch of ulna**.

This joint is responsible for the rotational movement of the palm, allowing it to turn anteriorly and posteriorly.