Osteology Flashcards
What is the neurocranium
8 bones that encase and protect the brain
Consists of calvaria, floor, cavity
What is the viscerocranium
14 bones making up the face and skull
Develop from pharyngeal arches 1&2
What ossification does the calvatia do
Membrane to bone by intramembranous
What ossification does the floor do
Cartilage to bone by endochondral
What suture joins occipital and parietal
Lambdoid
What suture joins frontal and parietal
Coronal
Why can you not see sutures on inside of old persons skull
Disappear from inside out
What are the fontanelles and when do they fuse
Unossified membranous gaps between flat bones
Anterior - 18 months - 2 years
Posterior- 1 - 3 months
What is early fusion of fontanelles called
Craniosynostosis
What are the fontanelles called in adults
Bredma and lambda
Why are fontanelles important
Allow shape of head to change during birth and as brain grows
What does bulging fontanelle indicate
Raised ICP
What does sunken fontanelle indicate
Dehydration
What are some features of calvaria bone
Inner spongy (diploe) bone between compact bone
Tri laminar
Protective strength without extra weight
What does the ACF contain
Cribriform plate- CN1 enters
