Give the position of glenoid cavity.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Glenoid Cavity**: The glenoid cavity is a part of the shoulder joint. It is essential to know what it is before identifying its position.

2. **Identifying the Scapula**: The scapula, commonly known as the shoulder blade, is the bone that forms the back part of the shoulder. The glenoid cavity is a feature of this bone.

3. **Locating the Glenoid Cavity**: The glenoid cavity is described as a shallow, pear-shaped (pyriform) articular surface. This means it serves as the socket for the shoulder joint.

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