Landmarks of the Skull and Cranial Bones
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| show | divides the body into left and right halves; for every AP and PA or lateral projection of the cranium, the midsagittal plane is perpendicular to or parallel to the plane of the IR.
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| show | a line that connects the pupils or the outer canthi of the patient's eyes; when head is placed in a true lateral position, the inter-pupillary line must be exactly perpendicular to the plane of the IR.
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| show | that ridge or arch of bone that extends across the forehead directly above each eye
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| show | a slight groove or depression that is slightly above the superciliary ridge above each eye
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| glabella | show 🗑
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| show | located at the junction of the two nasal bones and the frontal bone
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| acanthion | show 🗑
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| show | refers to the lower posterior angle on each side of the jaw or mandible
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| show | triangular area of the chin as it appears from the front
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| auricle, or pinna | show 🗑
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| show | the small cartilaginous flap that covers the opening of the ear
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| TEA | show 🗑
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| canthi | show 🗑
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| show | where the eyelids meet near the nose
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| outer canthus | show 🗑
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| show | the superior rim of the bony orbit of the eye
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| show | the inferior rim of the bony orbit of the eye
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| midlateral orbital margin | show 🗑
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| EAM, or external acoustic meatus | show 🗑
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| auricular point | show 🗑
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| show | the most superior positioning line between the glabella and the EAM; slightly above the eyebrow arch
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| show | located between the outer canthus (midlateral orbital margin) and the EAM
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| infraorbitomeatal line (IOML) | show 🗑
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| show | formed by connecting the acanthion to the EAM
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| mentomeatal line (MML) | show 🗑
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| lipsmeatal line (LML) | show 🗑
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| glabelloalveolar line (GAL) | show 🗑
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| show | the most prominent point of the external occipital protuberance; a posterior extension of the IOML approximates the location of the anion
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