Ethmoid bone — location?
Unpaired, anterior skull base, between orbits
Ethmoid bone — articulations?
Frontal, nasal, sphenoid, maxillary bones
Ethmoid bone — parts?
Cribriform plate, perpendicular plate, lateral masses, conchae
Cribriform plate — purpose?
Allows olfactory nerve (CN I) passage
Crista galli — role?
Attaches falx cerebri in meninges
Perpendicular plate — function?
Forms superior nasal septum
Lateral masses — contents?
Ethmoidal air cells, conchae
Sphenoid bone — location?
Central skull base, behind ethmoid
Sphenoid bone — parts?
Body, lesser wings, greater wings, pterygoid processes
Sphenoid bone — sella turcica?
Houses pituitary gland
Optic canal — position?
Between lesser wings of sphenoid
Foramina of sphenoid?
Rotundum, ovale, spinosum, optic canal
Pterygoid processes — invention?
Medial and lateral plates for muscle attachment
Temporal bone — location?
Lateral skull base, sides
Temporal bone — parts?
Squamous, mastoid, petrous
Squamous part — features?
Zygomatic process, mandibular fossa, articular tubercle
Mastoid part — features?
Mastoid process, mastoid air cells, foramen
Petrous part — contents?
Inner ear structures, internal acoustic meatus
Stylomastoid foramen — function?
Facial nerve (CN VII) exit
Carotid canal — contents?
Internal carotid artery
Temporal bone — muscle attachments?
Temporalis, sternocleidomastoid, digastric
Significance of temporal bones?
Hearing, balance, facial nerve path
Ethmoid & olfactory foramina?
Transmit CN I (olfactory nerves)
Sphenoid & sella turcica?
Houses pituitary gland, critical in endocrine function
Temporal & internal acoustic meatus?
Transmit facial and vestibulocochlear nerves
Temporal & stylomastoid foramen?
Facial nerve exits skull
Temporal & carotid canal?
Internal carotid artery entry into skull
Cranial bones — clinical relevance?
Fractures affect neurovascular structures and function
Ethmoid bone — what does it form?
Part of skull base, nasal septum, orbit wall
Sphenoid bone — location?
Central skull; articulates with all cranial bones
Temporal bone — includes?
Squamous, mastoid, petrous parts
Cribriform plate — function?
Passage for olfactory nerve fibers
Sella turcica — houses?
Pituitary gland
Stylomastoid foramen — exits?
Facial nerve (CN VII)
Carotid canal — purpose?
Internal carotid artery enters skull
Answer 22 questions on Cranial Bones: Anterior to Lateral.
1. Which feature of the ethmoid bone serves as an attachment point for the falx cerebri?
2. Which feature of the ethmoid bone serves as an attachment site for the falx cerebri?
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