The structure indicated is the mandibular notch.

The ramus of the mandible forms the lateral portion of the mandible. It has two processes:

1. Coronoid process
2. Condyloid process

These processes extend superiorly from the ramus of the mandible. The coronoid process is located anteriorly, and the condyloid process is located posteriorly. In between these two processes is a concave notch, known as the mandibular notch.

Passing through this notch are the following structures:

• Masseteric nerve
• Masseteric artery
• Masseteric vein

Learn more about the anatomy of the mandible in this tutorial.