Fossa cranii media

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Skull base, fossa cranii media (green)

The fossa cranii media (lat., Middle cranial fossa) is a section of the cranial cavity that houses the central part of the brain , the temporal lobe of the cerebrum and part of the brain stem . It lies between the anterior ( Fossa cranii anterior ) and the posterior fossa ( Fossa cranii posterior ) and is determined by the large and small wing of the sphenoid bone ( Ala major and Ala minor of the Os sphenoidale ).

The back (dorsal) delimitation of the fossa cranii media forms the rock part ( pars petrosa ) of the temporal bone ( os temporale ).

The floor of the middle cranial fossa consists of the large wing of the sphenoid bone and the pars squamosa ( pars squamosa ) of the temporal bone. Here is the so-called Turkish saddle ( Sella turcica ), which divides the middle cranial fossa in two halves. In its center there is a pit for the pituitary gland , the hypophysial fossa . At the rear, the Turkish saddle ends in the saddle back ( dorsum sellae ).

The middle cranial fossa contains parts of the fibrous cartilaginous chondrocranium , which close the foramen lacerum ('torn hole').

Skull penetrations

Entry point content
Optic Canal Optic nerve

Ophthalmic artery

Superior orbital fissure Oculomotor nerve

nerve Ophthalmic
nerve Abducens
nerve Nasociliary
nerve Frontal nerve Lacrimal
Superior ophthalmic vein

Foramen rotundum Maxillary nerve
Foramen oval Mandibular nerve

Arteria meningea accessoryoria
Plexus venosus foraminis ovalis

Foramen spinosum Meningeal artery media

Vena meningea media
Ramus meningeus of the nervus mandibularis

Foramen lacerum Petrosal major nerve

Nervus petrosus profundus

See also