Neurocranium

Question 1

Os frontale

Answer 1

• Forms the front wall of the skull and the upper part of the orbit
• Pair of sinuses (frontal sinus)
• Attachment of the temporal muscle
• Desmal ossification
  
  • Designed as paired bones linked with sutura frontalis, grows gradually between 6 and 24 months; in adulthood, exceptionally sutura metopica
    
    • Metopism (13% of the population)
• Squama frontalis
• Pars orbitalis
• Pars nasalis

Question 2

Os parietale

Answer 2

• It forms the main part of the skull, between the frontal and occipital bone
• The contact with temporal bone is thinner and the ages are overlapping (squamal border)
• Attachment for temporal bone (temporal line)
• Desmal ossification
• Facies externa
• Facies interna

Question 3

Os occipitale

Answer 3

• Forms the back of the skull cap and the back base part of the skull
• The foramen magnum enables the crossing spinal marrow
• The only bone of the skull which is connected to the atlas
• Attachments for neck muscle
• Desmal and hondral ossification
  
  • It develops in 5 parts, which overgrow between the 3rd month and 6th year of your life
• Squama occipitalis
• Pars baselaris et lateralis

Question 4

Os temporale

Answer 4

• Forms the side part of the skull cap and the side part of them the skull base
• Linked to parietal bone with squamal sutura
• It surrounds the sense organ for hearing and balance
• Attachments for neck muscle
• Desmal in hondral ossification from 3 parts
• Pars Squamosa
• Pars tympanica
• Pars petrosa

Question 5

Os sphenoidale

Answer 5

• Forms the front of the base skull, the side parts of the skull cap and walls behind the eye cavity
• Sinus sphenoidalis
• Attachments for masticatory muscles
• Desmal in hondral ossification
  
  • Designed from 6 parts
• Corpus sphenoidalis
• Ala major
• Ala minor
• Processus pterygoideus

Question 6

Os Ethmoidale

Answer 6

• Builds the frontal part of the base skull, the upper part of the nasal cavity (2 nasal shells), the upper part of nasal septum and the medial wall of orbit
• Linked with 13 bones
• Contains the sinus in the shape of small holes
• Hondral ossification- designed from 1 part