planes

Question 1

Outer canthus

Answer 1

• the point where the upper
  and lower eyelids meet laterally.

Question 2

Inner canthus

Answer 2

is where the eyelids meet near
the nose

Question 3

Infra-orbital margin/point

Answer 3

the inferior rim of the orbit,

Question 4

Nasion

Answer 4

the articulation between the nasal and frontal
bones

Question 5

Grabella

Answer 5

A bony prominence found on the frontal bone immediately superior to the nasion.

Question 6

External occipital protuberance (inion)

Answer 6

• Abony prominence found on the occipital bone, usually coincident with the median sagittal plane.

Question 7

External auditory meatus

Answer 7

• The opening within the ear that
  leads into the external auditory canal.

Question 8

The superciliary ridge (arch)

Answer 8

is an arch of bone that extends across the forehead directly above each eye.

Question 9

supraorbital groove (SOG)

Answer 9

• A depression above the superciliary arch

Question 10

Why is the SOG important

Answer 10

It corresponds to the highest level of the facial bone mass, which is also the level of the floor of the anterior fossa of the cranial vault.

Question 11

The acanthion

Answer 11

• is the midline point at
  the junction of the upper lip and the nasal septum

Question 12

Gonion

Answer 12

refers to the lower
posterior angle on each side of the jaw or mandible.

Question 13

Tragus

Answer 13

the small cartilaginous flap that covers the
opening of the ear