projection
A meatus is an opening; therefor, it's a depression, not a projection.
projection
projection
projection
is a depression
....opening?
a spine
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.
"A crest is a projection or ridge, especially of bone; cresta"source: chacha.com
projection. The bumps of bone around your knees and elbows are almost all called condyles.
The sharp slender process in a human bone is known as a spinous process, also called a neural spine. It is a bony projection that extends off the posterior side of the vertebra, serving as an attachment point for muscles and ligaments.
The nasal spine is a small bony projection located at the lower part of the nasal cavity between the two nostrils. It helps support the structure and shape of the nose.