gross anatomy of skull and facial bones
TRANSCRIPT
Gross Anatomy of Skull and Facial BonesObjective 1.
The Cranium and Its Subdivisions
• Two subdivisions of the Cranium:• Neurocranium – Skeleton of the Brain Capsule
• 8 bones – Frontal, 2 Parietal, 2 Temporal, Occipital, Sphenoid, Ethmoid
• Splanchnocranium/Viscerocranium – Facial skeleton• Maxillae, Palatine, Zygomatic, Nasal, Lacrimal, Inferior Nasal Conchae, Vomer,
Mandible, Hyoid
Neurocranium
• Calvaria – roof, flat dermal bones developed by Intramembranous Ossification• Enveloped by periosteum• Layers of bone beneath periosteum:
• Outer compact – strong• Trabecular/Spongy – contains diploic veins• Inner Compact - fragile
• Base of Neurocranium – lower part of skull formed by irregular bones, developed via Endochondral ossification
Anterior View
Lateral View
Superior View
Posterior View
Base of Skull
Base of Skull
Topographic Regions of the Skull
• Intracranial Regions• Anterior Cranial Fossa• Middle Cranial Fossa• Posterior Cranial Fossa
• Cavities of the Facial Skeleton• 2 Orbital Cavities• Nasal Cavity• Oral Cavity
Intracranial Regions
Intracranial Regions
Facial Skeleton
Joints Between Cranial BonesSynarthroses Synostoses Diarthroses
Sutures – coronal, sagittal, lamboid, temporoparietal
Osseous (occur during ossification of sutures between parts of cranial bones
Temporomandibular Joint (only synovial joint of the cranium)
Gomphoses – between teeth and gums
Cartilaginous – chondrocranium. Temporary and permanent (nasoseptal)
Membranes and Ligaments Ex. Frontallles Membrane, stylomandibular, stylohyoid ligaments
Movements of the Mandible
Thank You!Any Questions?