Ethmoid — what type of bone?
Unpaired, anterior skull base.
Cribriform plate — feature?
Has olfactory foramina for CN I.
Perpendicular plate — role?
Forms nasal septum; attaches falx cerebri.
Ethmoidal labyrinth — contains?
Ethmoidal cells (sinuses); articulates with orbit and nasal cavity.
Sphenoid — location?
Central, butterfly-shaped at skull base.
Sphenoid body — contains?
Sphenoidal sinuses, sella turcica.
Lesser wings — form?
Help delimit the optic canal.
Greater wings — include?
Foramina rotundum, ovale, spinosum.
Pterygoid processes — functions?
Attachment for pterygoid and palate muscles.
Temporal bone — location?
Lateral skull, protects hearing/balance organs.
Squamous part — features?
Attachment for temporalis muscle.
Mastoid process — contains?
Mastoid air cells; attachment for muscles.
Petrous part — houses?
Inner ear, internal acoustic meatus, carotid canal.
Internal acoustic meatus — transmits?
Facial (CN VII) and vestibulocochlear (CN VIII) nerves.
Olfactory foramina — pass through?
Olfactory nerves pass in cribriform plate.
Sphenoid sinus — location?
Bilateral air sinuses within sphenoid.
Sella turcica — purpose?
Houses pituitary gland.
Foramen rotundum — exits?
Maxillary nerve (V2).
Foramen ovale — transmits?
Mandibular nerve (V3).
Foramen spinosum — contains?
Middle meningeal vessels.
Jugular foramen — contains?
Sigmoid sinus, CN IX, X, XI.
Carotid canal — transmits?
Internal carotid artery.
Zygomatic process — forms?
Part of zygomatic arch.
Styloid process — attaches?
Stylohyoid ligament and muscles.
Temporal bone parts — main segments?
Squamous, mastoid, petrous.
Temporal bone — protection?
Houses ear, balance structures, key foramina.
Ethmoid bone — location?
Anterior skull base, part of neurocranium and viscerocranium.
Cribriform plate — function?
Transmits olfactory nerves (CN I).
Perpendicular plate — role?
Forms nasal septum, attaches to falx cerebri.
Sphenoid — key features?
Butterfly-shaped, central skull base, contains sella turcica.
Sella turcica — houses?
Pituitary gland.
Temporal bone — parts?
Squamous, petrous, mastoid parts.
Foramina — purpose?
Passageways for nerves and blood vessels.
Answer 19 questions on Cranial Bone Anatomy and Clinical Significance.
1. Which part of the ethmoid bone contains the olfactory foramina that transmit the olfactory nerves?
2. Which feature of the cribriform plate allows the passage of olfactory nerves from the nasal cavity to the brain?
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