Which one of the following statements is true?

Options

A. Head of humerus bone articulates with acetabulum of pectoral girdle.
B. Head of humerus bone articulates with glenoid cavity of pectoral girdle.
C. Head of humerus bone articulates with a cavity called acetabulum of pelvic girdle.
D. Head of humerus bone articulates with a glenoid cavity of pelvic girdle.

Answer

To determine which statement is true regarding the humorous bone and its connection to the pectoral girdle, we can analyze the information provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding the Humorous Bone**:
- The humorous bone is a long bone in the upper arm that connects at the shoulder with the pectoral girdle.
- It has a rounded head that fits into a socket.

**Hint**: Remember the structure of the humorous bone and its location in the arm.

2. **Identifying the Glenoid Cavity**:
- The head of the humorous bone connects to the glenoid cavity of the scapula (part of the pectoral girdle).
- The glenoid cavity is a shallow socket that allows for a wide range of motion in the shoulder joint.

**Hint**: Focus on the joint formed between the humorous bone and the scapula.

3. **Evaluating the Options**:
- Option A: "Head of humorous bone articulates with acetabulum of pectoral girdle."
- This is incorrect because the acetabulum is part of the pelvic girdle, not the pectoral girdle.

**Hint**: Distinguish between the pectoral and pelvic girdles.

- Option B: "Head of humorous bone articulates with glenoid cavity of pectoral girdle."
- This is correct as it describes the actual anatomical connection.

**Hint**: Confirm the anatomical terminology used in the statement.

- Option C: "Head of humorous bone articulates with acetabulum of pectoral girdle."
- This is incorrect for the same reason as option A.

**Hint**: Remember that the acetabulum is not associated with the pectoral girdle.

- Option D: "Head of humorous bone articulates with glenoid cavity of pectoral girdle."
- This is a repetition of option B and is also correct.

**Hint**: Check if there are any duplicates in the options.

4. **Conclusion**:
- The correct answer is Option B: "Head of humorous bone articulates with glenoid cavity of pectoral girdle."

### Final Answer:
The true statement is: **"Head of humorous bone articulates with glenoid cavity of pectoral girdle."**