Shoulder joint present between `:-`

Options

A. Glenoid cavity of pectoral girdle & head of humerus
B. Coronoid process of pectoral girdle & head of humerus
C. Sigmoid notch and olecronon process of ulna
D. Sigmoid notch and Trochlea of humerus

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks about the anatomical structures that form the shoulder joint.

2. **Identifying the Options**: The options provided are:
- A) Glenoid cavity of pectoral girdle and head of humerus
- B) Coracoid process of pectoral girdle and head of humerus
- C) Sigmoid notch and olecranon process of ulna
- D) Sigmoid notch and trochlea of humerus

3. **Analyzing the Shoulder Joint**: The shoulder joint is formed by the articulation of the humerus (the upper arm bone) and the scapula (shoulder blade). The specific part of the scapula that interacts with the humerus is called the glenoid cavity.

4. **Identifying the Correct Structures**:
- The **glenoid cavity** is a shallow socket in the scapula that receives the head of the humerus.
- The **head of the humerus** is the rounded upper end of the humerus that fits into the glenoid cavity.

5. **Selecting the Correct Option**: Based on the anatomical relationship, the correct answer is:
- **A) Glenoid cavity of pectoral girdle and head of humerus**.

### Final Answer
The shoulder joint is present between the **glenoid cavity of the pectoral girdle and the head of the humerus**.

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