Muscle that rotates the arm laterally.

Teres Minor

Explanation:

Teres Minor -

The muscle , Teres Minor , is one of the part of the four muscles that are comprised of the Rotator Cuff.

The Teres Minor are basically elongated and narrow muscles of the rotor cuff.

The muscle originates form the middle part of the lateral border.

The functions of teres minor are -

1. Laterally rotates the arm at the shoulder joint.

2. Abducts the arm at the shoulder joint.

Hence,

The muscle that rotates the arm laterally - Teres Minor.

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