Transcript Chapter 11
Chapter 11 Cranium Part 1 Cranial Bones • Skull = __________ and ________ bones • Cranium (8 bones) – Area that surrounds and protects the brain. – ____________ (Skull Cap) – Floor Calvarium • __________ • Parietal (Right and Left) • __________ Frontal Bone • ____________ (Vertical) Portion – Forehead • ___________ (Horizontal) Portion – Superior Orbits Frontal Bone Squamous • ___________ – Area between eyebrows • _____________ Groove – Depression above eyebrows • ______________margin – Superior rim of orbit • _____________ ridge (Arch) – Ridge beneath eyebrow Frontal Bone Orbital • _____________plate – Superior portion of each orbit • _______________ Notch – Separates orbital plate • Articulates with 4 cranial bones – Right and left parietals, sphenoid, _________ Parietal Bones • Forms the __________calvarium. • Articulates with 5 cranial bones – Frontal, occipital, temporal, sphenoid, parietal Occipital Bone • ___________portion of the calvarium. • Squamous Portion • _______________Protuberance (Inion) – Prominent bump on the back of head. Occipital • ____________Magnum – Hole for spinal cord • _______________ condyles – Articulating surface on each side of foramen magnum. • Articulates with 6 bones – 2 parietals, 2 temporals, sphenoid, ________ Cranial Floor • Temporal (Right and Left) • __________ • Ethmoid Temporal Bone • Lateral aspect of skull. • 3 Portions – ___________ – ___________ – ___________ Temporal Squamous Portion • Vertical aspect and very thin. • _______________ – Articulates with Zygoma – ____________ Temporal Mastoid Portion • Posterior to ___________ • _____________ • Mastoid Tip Temporal Petrous Portion • Houses hearing and equilibrium • _______________ – Petrous Ridges • _______________Meatus – Opening for the nerves of hearing and equilibrium • ________________ Sphenoid • Centrally located. Anchors all 7 cranial bones. • _______________(Turk’s Saddle) – Houses _______________ – __________sellae – Posterior wall of sella – _____ – Depression posterior to dorsum sella. – Posterior clinoid – Anterior clinoid Sphenoid • ___________ Wings – Anterior clinoid • ___________ Wings – Forms portion of floor and walls of cranium Sphenoid • Lateral ______________ – Lateral downward projections • Medial ________________ – Medial downward projections • ___________ hamuli – Process off of medial pterygoid Sphenoid Foramen • Foramen ____________ • Foramen ____________ • Foramen ____________ Sphenoid Optic Components • Optic __________ (Chiasm) – Groove between Anterior body and lesser wings • Optic ___________ – Hole between anterior body and lesser wings • Superior ______________ – Space lateral to optic foramen between lesser and greater wings Ethmoid Bone • Small bone lying primarily below floor of cranium. • Articulates with 2 cranial bones. • ____________ – Horizontal portion • ____________ – Superior projection from cribriform plate into frontal bone More Ethmoid • _________________ plate – Downward projection forms nasal septum • Lateral _____________ (masses) – Suspend from cribiform • Nasal ___________(Turbinates) – Downward projection from labyrinth Sutures • Areas of cranial fusion – Synarthrodial • __________ suture – Fuses Parietal to Frontal bone • ___________suture – Fuses right and left Parietal • __________suture – Fuses Parietal to Occipital • __________ suture – Fuses Parietal to Temporal Fontanels Membrane area as a Child • Anterior • Posterior • Sphenoid (2) • Mastoid (2) Suture Articulations Adult • ____________ – Frontal and parietals • ____________ – Occipital and parietals • ___________ Rt/Lt – GW of sphenoid, temporal, parietal, frontal • ___________ Rt/Lt – Temporal, occipital, parietal