Flashcard: Ethmoid & Sphenoid Bones — 32 carte

Ethmoid bone — location?

Anterior skull base, medial orbit wall, nasal septum

Ethmoid — location?

Anterior skull base, nasal septum, medial orbit walls.

Ethmoid bone — parts?

Cribriform plate, perpendicular plate, lateral masses

Sphenoid — shape?

Butterfly-shaped at skull base.

Cribriform plate — role?

Transmits olfactory nerves (CN I)

Temporal — parts?

Squamous, mastoid, petrous.

Perpendicular plate — function?

Forms nasal septum

Cribriform plate — function?

Passage of olfactory nerves (CN I).

Lateral masses — contain?

Ethmoidal cells and conchae

Sella turcica — houses?

Pituitary gland.

Ethmoid conchae & meatuses — significance?

Air circulation and drainage pathways in nasal cavity

Pterygoid processes — role?

Muscle attachments, form pterygoid fossa.

Sphenoid bone — location?

Central skull base, behind orbits

Temporal bone — features?

Zygomatic process, mastoid, styloid processes.

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