Which term describes a deep indentation in a bone?

• A. Condyle
• B. Notch
• C. Angle
• D. Fossa

Answer: (B)

A notch is the term that describes a deep indentation along the edge of a bone. It marks a distinct cut or groove at the border, which helps create a space or passage for nerves, vessels, or for the arrangement of adjacent parts. This differs from a fossa, which is a shallow depression or basin on the bone surface, not necessarily at the edge. A condyle is a rounded projection that forms part of a joint surface, and an angle is a bend or corner of the bone, not an indentation. So when you’re identifying a deep indentation along the edge of a bone, notch is the appropriate term. For example, the mandibular notch is a deep indentation between the coronoid process and the condyle of the mandible.