Head of humerus bones articulates with glenoid cavity of pectoral girdle.

Explanation

**Step-by-Step Solution:**

1. **Identify the Bones Involved**: The question mentions the head of the humerus and the glenoid cavity of the pectoral girdle. The humerus is the bone of the upper arm, while the glenoid cavity is part of the scapula (shoulder blade).

2. **Understand the Articulation**: Articulation refers to the connection between two bones. In this case, we need to determine if the head of the humerus connects with the glenoid cavity.

3. **Location of the Glenoid Cavity**: The glenoid cavity is located at the lateral angle of the scapula. It serves as the socket for the shoulder joint.

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