# Oral diaphragm is formed by:
A. Mylohyoid muscle
B. Genioglossus muscle
C. Buccinator muscle
D. Orbicularis oris muscle
The correct answer is A. Mylohyoid muscle.
The mylohyoid muscle or diaphragma oris is a paired muscle running from the mandible to the hyoid bone, forming the floor of the oral cavity of the mouth.
The mylohyoid muscle is flat and triangular, and is situated immediately superior to the anterior belly of the digastric muscle. It is a pharyngeal muscle (derived from the first pharyngeal arch) and classified as one of the suprahyoid muscles. Together, the paired mylohyoid muscles form a muscular floor for the oral cavity of the mouth.
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