Skull Foramina & Pterion & Skull Norma - Frontalis😊

Skull Norma - Frontalis

External nose

  • The upper one-third → nasal bones
  • The lower two-thirds → cartilages
  • Meet at nasion

Processes of Maxilla

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  • Three processes:
    • Frontal
    • Zygomatic
    • Alveolar

Zygomatic Bone

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  • Zygomatic arch is formed by temporal bone
      • # Zygomatic arch /# temporal bone
      # Zygomatic arch /# temporal bone

Supraorbital Notch

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  • Transmits supraorbital nerve and vessels
  • Located at:
    • Junction of lateral 2/3 and medial 1/3 of superior orbital margin
  • Superciliary arch lies superior to it
  • Both notches meet at glabella

Margins of Orbit

Margins of orbit
Details
Lateral
Formed by zygomaticofrontal suture
Inferior
- Lateral 1/3: Zygomatic bone
- Medial 2/3: Maxillary bone
Medial
- Superior part: Frontal bone
- Inferior part: Lacrimal crest on frontal process of maxilla
Inferior margin of nasal bone
Articulates with nasal cartilages
Infraorbital foramen
- Located just below inferior orbital margin
- Transmits infraorbital nerve
Vomer bone
Located at centre of nasal aperture

Canine Fossa

  • Depression above canine teeth on maxilla
  • Incisive fossa lies above incisors