Which statement best describes the mylohyoid ridge (internal oblique ridge)?

• A. A bony prominence on the lingual surface of the mandible; attachment for the mylohyoid muscle.
• B. A bony depression on the buccal surface of the mandible for masseter attachment.
• C. An extension of the anterior border of the mandibular ramus projecting backward.
• D. A prominence on the inferior border of the mandible for muscle attachment.

Answer: (A)

The location and function of the mylohyoid ridge are what’s being tested here. The mylohyoid ridge, also called the internal oblique ridge, is a bony prominence on the inner (lingual) surface of the mandible. It provides the attachment for the mylohyoid muscle, which forms the floor of the mouth and helps elevate it during swallowing. Because the attachment is on the lingual side, the ridge is described as a feature of the internal surface, not the buccal surface. The other statements mischaracterize the surface or the muscle attachment, so they don’t fit.