Transverse Arytenoid Muscle
• Only intrinsic muscle that is not paired.
• Extends horizontally across the backs of the arytenoids.
• The fibers arise from the lateral margin and posterior surface of one arytenoid cartilage, course in a horizontal direction, and insert on the opposite arytenoid (Zemlin, 1998)
• Pulls middle edges of arytenoids together from bottom to top.