Cranial Bones: Ethmoid, Sphenoid, Temporal

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Cranial Bones I: Ethmoid, Sphenoid, and Temporal Bones – Revision Sheet

1. 📌 Essentials

  • Ethmoid bone: Unpaired, anterior skull base; forms part of nasal septum and medial orbit wall.
  • Sphenoid bone: Central skull base; articulates with all neurocranial bones; contains sella turcica.
  • Temporal bone: Lateral skull base; protects auditory and vestibular organs; contains mastoid, squamous, petrous parts.
  • Cribriform plate: Horizontal ethmoid segment with foramina for olfactory nerves (CN I).
  • Optic canal: Passage in lesser wing of sphenoid for CN II and ophthalmic artery.
  • Sella turcica: Saddle-shaped depression in sphenoid for pituitary gland.
  • Pterygoid processes: Projections from sphenoid for muscle attachments; separated by pterygoid fossa.
  • Temporal squama: Thin, convex, attachment site for temporalis muscle.
  • Mastoid process: Posteroinferior temporal part; contains air cells, attaches SCM.
  • Petrous portion: Houses inner ear; joins sphenoid and occipital bones; contains foramina like internal acoustic meatus.

2. 🧩 Key Structures & Components

  • Ethmoid bone / Parts
    • Cribriform plate — olfactory nerve passage
    • Perpendicular plate — nasal septum
    • Lateral masses / Ethmoidal labyrinth — ethmoidal sinuses, medial orbit walls
    • Superior and middle nasal conchae — scroll-shaped mucosal turbinates
    • Lamina papyracea — lateral orbital wall
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Aperçu du QCM

1. What is the primary function of the pterygoid hamulus?

2. Which cranial bone contains the sella turcica, a saddle-shaped depression that houses the pituitary gland?

3. Which part of the ethmoid bone contains the foramina for the passage of the olfactory nerves?

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Aperçu des flashcards

What are the main cranial bones covered in this unit and their general locations?

The main bones are the Ethmoid (anterior, unpaired, forming part of the skull base, nasal septum, and orbit walls), Sphenoid (medial skull base, articulating with all neurocranial bones), and Temporal (lateral skull, protecting auditory and vestibular organs).

Ethmoid bone — role?

Part of nasal septum and orbit walls.

What are the main features and foramina of the sphenoid bone?

The sphenoid has a body with sphenoidal sinuses, lesser and greater wings forming cranial fossae and orbit walls, and pterygoid processes. Important foramina include rotundum (V2), ovale (V3), and spinosum (middle meningeal artery) for nerve and vessel passage, and the optic canal transmitting CN II and the ophthalmic artery.

Sphenoid bone — location?

Central skull base, articulates with all cranial bones.

Describe the key features of the ethmoid bone and its clinical significance.

The ethmoid is an unpaired anterior skull base bone with the cribriform plate for olfactory nerves and the perpendicular plate forming part of the nasal septum. Its lateral masses house ethmoidal sinuses and contribute to the medial walls of the orbit. It is crucial for the sense of smell and nasal structure.

Temporal bone — main parts?

Squamous, mastoid, petrous parts.

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