At the glenoid cavity, the scapula articulates with the proximal end of the (a) humerus, (b) radius, (c) ulna, (d) femur.

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Step 1: Understand the anatomy of the shoulder joint, specifically the glenoid cavity, which is a part of the scapula (shoulder blade).

Step 2: Recall that the glenoid cavity is a shallow socket that forms the socket part of the ball-and-socket joint of the shoulder.

Step 3: Identify the bone that fits into this socket to form the shoulder joint. This bone must have a proximal end shaped like a ball to fit into the glenoid cavity.

Step 4: Review the options: (a) humerus, (b) radius, (c) ulna, (d) femur. Consider which of these bones is located in the upper arm and has a proximal end that articulates with the scapula.

Step 5: Conclude that the humerus is the bone that articulates with the glenoid cavity of the scapula, forming the shoulder joint.

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Glenoid Cavity

The glenoid cavity is a shallow, articular depression on the lateral aspect of the scapula. It serves as the socket for the ball-and-socket joint of the shoulder, allowing articulation with the head of the humerus. Understanding its location and function is key to identifying the correct bone it connects with.

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Organization of the Thoracic Cavity

Humerus Anatomy

The humerus is the long bone of the upper arm, with a rounded head that fits into the glenoid cavity of the scapula. This articulation forms the shoulder joint, enabling a wide range of arm movements. Recognizing the humerus as the proximal bone of the arm is essential for answering the question.

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Clitoral Anatomy

Articulation and Joint Types

Articulation refers to the connection between bones at a joint. The shoulder joint is a ball-and-socket joint, characterized by the humeral head fitting into the glenoid cavity. Knowing joint types helps in understanding which bones connect and how they move relative to each other.

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