Ethmoid bone — location?
Anterior skull base, medial orbit wall, nasal septum
Ethmoid bone — parts?
Cribriform plate, perpendicular plate, lateral masses
Cribriform plate — role?
Transmits olfactory nerves (CN I)
Perpendicular plate — function?
Forms nasal septum
Lateral masses — contain?
Ethmoidal cells and conchae
Ethmoid conchae & meatuses — significance?
Air circulation and drainage pathways in nasal cavity
Sphenoid bone — location?
Central skull base, behind orbits
Sphenoid bone — parts?
Body, lesser wings, greater wings, pterygoid processes
Sphenoid body — contains?
Sphenoidal sinuses, sella turcica
Sella turcica — houses?
Pituitary gland
Lesser wings — form?
Anterior boundary of optic canal
Greater wings — contribute to?
Cranial floor, lateral orbital wall
Pterygoid processes — features?
Medial/lateral plates, pterygoid hamulus
Optic canal — transmits?
CN II and ophthalmic artery
Sphenoid foramina?
Rotundum, ovale, spinosum (cranial nerves and vessels)
Temporal bone — location?
Lateral sides of skull
Temporal bone — parts?
Squama, mastoid, petrous, tympanic parts
Squama — function?
Attachment for temporalis muscle
Mastoid process — features?
Contains mastoid air cells, SCM attachment
Petrous portion — houses?
Inner ear structures, carotid canal
Styloid process — role?
Muscle and ligament attachment
Temporal bone — other features?
Mastoid foramen, sigmoid sulcus, stylomastoid foramen
Summary — ethmoid role?
Forms nasal septum, medial orbit wall; transmits olfactory nerves
Summary — sphenoid role?
Central skull base; contains sella turcica and foramina
Summary — temporal role?
Protects auditory/vestibular organs; provides muscle attachments
Ethmoid — location?
Anterior skull base, nasal septum, medial orbit walls.
Sphenoid — shape?
Butterfly-shaped at skull base.
Temporal — parts?
Squamous, mastoid, petrous.
Cribriform plate — function?
Passage of olfactory nerves (CN I).
Sella turcica — houses?
Pituitary gland.
Pterygoid processes — role?
Muscle attachments, form pterygoid fossa.
Temporal bone — features?
Zygomatic process, mastoid, styloid processes.
Answer 19 questions on Ethmoid & Sphenoid Bones.
1. Where is the ethmoid bone primarily localized within the skull?
2. Which parts constitute the ethmoid bone?
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