#Anatomy #Posterior #cranial #Fossa
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Anatomy of Posterior cranial fossa
The posterior cranial fossa (latin: fossa cranii posterior) lies on the lowest stage of the inner cranial base and is the biggest of the three cranial fossae.
The boundaries of the posterior cranial fossa are fashioned anteriorly by the dorsum sellae, posterior features of the physique of the sphenoid and the basilar a part of occipital bone; posteriorly by the squamous a part of the occipital bone; laterally by the petrous and mastoid components of the temporal bone and by the lateral components of the occipital bone.
The bottom or flooring of the posterior cranial fossa is fashioned by the occipital bone, the posterior floor of the petrosal a part of the temporal bone, and the mastoid angle of the parietal bone.
Borders
The borders of the posterior cranial fossa ar the next:
anteromedial: dorsum sellae of the sphenoid;
anterolateral: superior border of the petrous a part of the temporal bone;
posterior: squamous a part of the occipital bone, groove for transverse sinus, inside occipital protuberance;
inferior: mastoid a part of the temporal bone, the squamous, condylar and basilar components of the occipital bone.
Contents
The posterior cranial fossa accommodates the next components of the mind:
cerebellum,
brainstem.
Openings
There are a number of opening connecting the posterior cranial fossa with different components of the cranium, these are as following:
internal acoustic meatus,
opening of vestibular canaliculus,
mastoid foramen,
foramen magnum,
hypoglossal canal,
condylar canal,
jugular foramen.
The primary three openings talked about above – internal acoustic meatus, opening of the vestibular canaliculus and mastoid foramen – are situated within the temporal bone.
The internal acoustic meatus is a paired canal connecting the posterior cranial fossa and the facial canal. It transmits the facial nerve and the vestibulocochlear nerve, and in addition the labyrinthine artery.
The opening of the vestibular canaliculus connects the posterior cranial fossa with the vestibule of the inner ear. The vestibular canaliculus carries the vestibular aqueduct.
The mastoid foramen leads from the posterior cranial fossa to the exterior cranial base and transmits the mastoid emissary vein, a small department of the occipital artery, and the posterior meningeal artery.
Three openings of the posterior cranial fossa are situated within the occipital bone, these are the foramen magnum, hypoglossal canal, and condylar canal.
The foramen magnum is the biggest opening within the cranium base connecting the posterior cranial fossa with the exterior cranial base. The foramen magnum transmits the decrease finish of the medulla oblongata, the vertebral artery, the spinal root of the accent nerve and the anterior and posterior spinal arteries.
The paired hypoglossal canal results in the exterior cranial base and carries the hypoglossal nerve
The paired condylar canal additionally results in the exterior floor of the cranial base and conducts the occipital emissary vein.
The jugular foramen varieties bilaterally between the occipital and temporal bones within the posterior cranial fossa and results in the exterior floor of the cranial base. The jugular foramen transmits the inferior petrosal and sigmoid sinuses, and the glossopharyngeal, vagus, and accent nerves.
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