Ethmoid — location?
Unpaired, anterior skull base.
Cranium — bones forming?
Ethmoid, sphenoid, temporal, other bones.
Ethmoid — joints?
Joins frontal, nasal, sphenoid bones.
Ethmoid — location?
Anterior skull base; nasal septum, orbit walls.
Ethmoid — parts?
Cribriform plate, perpendicular plate, labyrinth, conchae.
Sphenoid — role?
Houses sella turcica; central skull base.
Cribriform plate — CN I?
Transmits olfactory nerve (CN I).
Temporal bone — function?
Houses ear structures; forms lateral skull base.
Perpendicular plate — role?
Forms superior part of nasal septum.
Foramen rotundum — transmits?
V2 (maxillary nerve).
Ethmoidal labyrinth — contains?
Air cells (ethmoidal sinuses).
Optic canal — formed by?
Lesser and greater wings of sphenoid.
Conchae — purpose?
Air filtration and warming.
Mastoid process — contains?
Air cells communicating with middle ear.
Meatuses — location?
Below each concha.
Lamina papyracea —?
Thin part of ethmoid, medial orbit wall.
Sphenoid — location?
Central skull base.
Sphenoid — parts?
Body, lesser wings, greater wings, pterygoid processes.
Sphenoid — sella turcica?
Houses pituitary gland.
Lesser wings — features?
Form optic canals.
Greater wings — features?
Form temporal surface, foramina rotundum, ovale, spinosum.
Pterygoid processes — function?
Muscle attachment, shape pterygoid fossa.
Optic canal — location?
Between lesser and greater wings.
Temporal bone — parts?
Squama, zygomatic process, mastoid, petrous, styloid.
Squama — role?
Attachment for temporalis muscle.
Mastoid process — contains?
Air cells (mastoid air cells).
Petrous part — houses?
Inner ear structures.
Stylomastoid foramen — transmits?
Facial nerve (CN VII).
Temporal bone — main functions?
Protects hearing, balance organs, neurovascular structures.
Zygomatic process — articulates?
Zygomatic bone.
Meatus — meaning?
Passageway for mucous membranes.
Fornamen rotundum — nerve?
Maxillary nerve (V2).
Fornamen ovale — nerve?
Mandibular nerve (V3).
Fornamen spinosum — contains?
Middle meningeal artery.
Mastoid process — attached muscles?
Neck muscles like sternocleidomastoid.
Inner ear in petrous part — functions?
Hearing and balance.
Cranial bone ossification?
Endochondral ossification.
Test your knowledge with 22 questions on Cranial Bone Anatomy Fundamentals.
1. Which structure of the ethmoid bone contains olfactory foramina for cranial nerve I passage?
2. Which bone contributes to forming the nasal septum and orbit walls as part of the skull base?
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