The document provides anatomical definitions and descriptions of various key points and landmarks on the human skull, including the vertex, glabella, nasion, canthi, external occipital protuberance, gonion, external auditory meatus, interpupillary line, orbitomeatal line, infraorbital margin, and infraorbitomeatal line. Each term is defined in relation to its position and significance in radiographic imaging. This information is intended for educational purposes in the field of radio-imaging technology.

1. Presented By – Mr. Ayush Kumar Gupta
Assistant professor (Department of Radio-Imaging Technology)
Mewar University, Gangrar, Chittorgarh

2. 1. VERTEX
 The Vertex is the most superior point of the skull in the median sagittal plane.

3. 2. GLABELLA
 It is part of the forehead above the bridge of the nose between the eyebrows.

4. 3. NASION
 It is the junction of the two nasal bones and the frontal bone.

5. 4. OUTER CANTHUS
 It is the junction of the eyelid where the upper and lower eyelids meet laterally.

6. 5. INNER CANTHUS
 It is a junction where the eyelids meet near the nose.

7. 6. EXTERNAL OCCIPITAL
PROTUBERANCE (INION)
 The inion is the most prominent point of the occipital bone at the junction of the
head and neck.

8. 7. ANGLE (GONION)
 The gonion refers to the angle of the mandible.

9. 8. EXTERNAL
AUDITORY/ACOUSTIC
MEATUS (EAM)
It is opening of the external ear canal.

10. 9. INTERPUPILLARY LINE
OR INTER-ORBITAL LINE
It is the line that connects the two pupils or
the outer canthi of the eyes.

11. 10. ORBITOMEATAL LINE
(OML) RADIOGRAPHIC
BASELINE
It is located between the outer canthus of the eye
and the EAM of the ear.

12. 11. INFRAORBITAL MARGIN
It is the lower margin of the eye socket.

13. 12. INFRAORBITOMEATAL
LINE (IOML)
It is an imaginary line that connects the
infraorbital margin to the EAM.