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12. Landmark Shape and location Pterion G. Wing sphenoid Lambda Pt. of coronal/sagittal sutures Bregma (forepart of head) Pt. of coronal/sagittal sutures Vertex Superior part of skull Asterion Starshaped, parietomastoid, occipitomastoid and lambdoid sutures Glabella At the root of the nose Inion ( back of head) Prominent at external occipital protuberance Nasion ( nose) Meeting of frontonasal and internasal sutures
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15. Facial muscles Facial expression 1. Orbicularis oris Oral sphincter, pucker, whistle 2. Dilator muscles Open mouth wide 3. Levator labii superioris alaque nasi Elevate upper lip and wing of nose 4. Mentalis Expression of doubt 5. Buccinator Aids in mastication, blowing 6. Depressor anguli oris 7. Procerus Frowning,depress angle mouth Draws eyebrow inferior, frown 8. Levator anguli oris Elevates corner of mouth 9. Zygomaticus major Smile, laughing 10. Zygomaticus minor Raise upper lips in sadness 11.Levator labii superioris Deepens nasolabial sulcus in sadness 12.Depressor labii inferior Draws lips laterally in impatience 13. Risorius 14. Platysma From platysma n maseter, grin Draws mouth inferior, grimace or horror