The only mandible I know of is the lower jaw in many species. Sorry if I'm wrong.
Depression is the medical term meaning the act of lowering a body part. So opening your mouth is also depressing your mandible.
The submandibular gland is located in a small depression on the medial surface of the mandible below the canine. It is one of the major salivary glands and produces around 70% of the saliva in the mouth.
The mandible is attached to the skull at the temporomandibular joint (TMJ). It allows for movements like opening and closing the mouth, chewing, and speaking.
A meatus is an opening; therefor, it's a depression, not a projection.
The masseter inserts on the mandible, specifically on the angle and ramus. The temporalis inserts on the coronoid process of the mandible. The lateral pterygoid inserts on the condyloid process of the mandible, while the medial pterygoid inserts on the angle of the mandible.
Depression is the medical term meaning the act of lowering a body part. So opening your mouth is also depressing your mandible.
External
The antagonist for the mandible is the temporalis muscle. It is responsible for closing the jaw while the mandible is involved in opening the jaw.
Stoma is the medical term for mouth or opening.
the temporal bone
The masseter acts as the antagonist.
is a depression
....opening?
The submandibular gland is located in a small depression on the medial surface of the mandible below the canine. It is one of the major salivary glands and produces around 70% of the saliva in the mouth.
The mandible is attached to the skull at the temporomandibular joint (TMJ). It allows for movements like opening and closing the mouth, chewing, and speaking.
A fissure is an opening or crack in the Earth's crust, typically where tectonic plates meet. It is not a projection or depression, but rather a narrow, long fracture in the ground.
The mandible articulates with the temporal bone to form the temporomandibular joint (TMJ), which is a freely movable joint that allows for actions such as opening and closing the mouth, chewing, and speaking.