Cranial Bones Anatomy Lecture

Overview

• Total Skull Bones: 22 (8 cranial, 14 facial)
• Function of Cranial Bones: Protect the brain

Mnemonic for Cranial Bones

• Mnemonic: "Eight Osseous Parts Form The Skull"
• Cranial Bones:
  • Ethmoid
  • Occipital
  • Parietal
  • Frontal
  • Temporal
  • Sphenoid

Ethmoid Bone

• Location: Roof of the nose, between orbits
• Features:
  • Separates nasal cavity from the brain
  • Articulates with frontal and sphenoid bones
  • Contains ethmoid sinus
  • Cribriform Plate: Passage for olfactory nerves (smell)
  • Crista Galli: Attaches brain to skull via a membrane

Occipital Bone

• Location: Back of the skull
• Features:
  • Lambdoid Suture: Connects occipital with parietal bones
  • External Occipital Protuberance: Neck muscle attachment
  • Occipital Condyles: Articulate with C1 (atlas)
  • Foramen Magnum: Passage for brainstem

Parietal Bones (2)

• Location: Sides of the skull
• Sutures:
  • Coronal Suture: Connects to frontal bone
  • Squamous Suture: Connects to temporal bones
  • Sagittal Suture: Connects two parietal bones
  • Lambdoid Suture: Connects to occipital bone

Frontal Bone

• Location: Forehead
• Features:
  • Superior aspect of orbits
  • Supraorbital Foramen: Passage for supraorbital nerve

Temporal Bones (2)

• Features:
  • Squamous Suture: Connects to parietal bones
  • Zygomatic Process: Part of the cheekbone
  • Auditory Meatus: Canal to inner ear
  • Mastoid Process: Neck muscle attachment
  • Styloid Process: Muscle attachment for tongue and larynx
  • Mandibular Fossa: Articulates with mandible

Sphenoid Bone

• Unique Feature: Articulates with all other cranial bones
• Main Feature: Sella Turcica (pituitary gland seat)
• Anatomical Parts:
  • Greater Wing
  • Lesser Wing
  • Pterygoid Processes
  • Body

Conclusion

• Facial bones to be covered in another video
• Encouragement to subscribe for more educational content