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11th and 12th pairs of ribs are not connected ventrally and are therefore, called floating ribs. Acromion is a flat expanded process of spine of scapula. The lateral end of clavicle articulates with acromion process. Scapula is a flat triangular bone in the dorsal part of the thorax between 2nd and the 7th rib. Glenoid cavity of scapula articulates with head of the humerus to form the shoulder joint.

1. 11th and 12th pairs of ribs are not connected ventrally and are therefore, called floating ribs.
2. Acromion is a flat expanded process of spine of scapula.
3. The lateral end of clavicle articulates with acromion process.
4. Glenoid cavity of scapula articulates with head of the humerus to form the shoulder joint.

Correct answer: 11th and 12th pairs of ribs are not connected ventrally and are therefore, called floating ribs.

Solution

The correct choice is the rib statement because the 11th and 12th ribs do not attach ventrally to the sternum, so they are called floating ribs. The other options describe normal features of the scapula, clavicle, and shoulder joint.

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