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Anterior cranial fossa

The anterior cranial fossa (Latin: fossa cranii anterior) lies at the highest level of the internal cranial base and is formed by the cribriform plate of the ethmoid bone, orbital plate of the frontal bone, and lesser wings of the sphenoid.

Anterior cranial fossa
Anterior cranial fossa by Anatomy.app
Fossae of internal cranial base
Fossae of internal cranial base by Anatomy.app

 

Borders of anterior cranial fossa

The borders of the anterior cranial fossa are marked by the following structures:

Borders of anterior cranial fossa
Borders of anterior cranial fossa by Anatomy.app
Walls of anterior cranial fossa
Walls of anterior cranial fossa by Anatomy.app
Internal cranial base, bones forming anterior cranial fossa (colored)
Anterior cranial fossa by Anatomy.app

 

Contents of anterior cranial fossa

The anterior cranial fossa contains the following parts of the brain:

 

Openings of anterior cranial fossa

There are several openings connecting the anterior cranial fossa with other parts of the skull, and these are the following:

  • Anterior ethmoidal foramen
  • Cribriform foramina (foramina of the cribriform plate)
Openings of anterior cranial fossa
Openings of anterior cranial fossa by Anatomy.app

The paired anterior ethmoidal foramen connects the anterior cranial fossa with the orbit on both sides. This opening transmits the anterior ethmoidal nerve (arises from the nasociliary nerve, which is a branch of the ophthalmic nerve (CN V1)) and the anterior ethmoidal artery and vein.

The cribriform foramina are numerous tiny openings or perforations in the cribriform plate of the ethmoid bone, therefore, they are also known as the foramina of the cribriform plate. These openings connect the anterior cranial fossa with the nasal cavity and transmit the olfactory nerves (CN I).