Ethmoid & Sphenoid Bones

From the study guide

Cranial and Facial Bones I: Ethmoid, Sphenoid, Temporal Bones

1. 📌 Essentials

  • The ethmoid bone is unpaired, located in the anterior skull base, forming part of the nasal septum and medial orbit walls.
  • The sphenoid bone is a complex, butterfly-shaped bone at the skull's base, connecting cranial bones and forming part of the sella turcica.
  • The temporal bone is situated at the skull's sides, comprising squamous, mastoid, and petrous parts, protecting hearing and balance organs.
  • The ethmoid joins the frontal, nasal, and sphenoid bones, linking anterior and middle cranial fossae with nasal structures.
  • The sphenoid articulates with all neurocranial bones, acting as a central "keystone" at the skull base.
  • The temporal bone includes critical landmarks like the zygomatic process, mastoid process, and styloid process; important in attachment and neurovascular passage.

2. 🧩 Key Structures & Components

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Practice quiz preview

1. Where is the ethmoid bone primarily localized within the skull?

2. Which parts constitute the ethmoid bone?

3. What passes through the cribriform plate of the ethmoid bone?

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Flashcard preview

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

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