Tentorium cerebelli

The tentorium cerebelli (German cerebellum tent) is a transverse cerebral membrane structure between the occipital lobe of the cerebrum and the cerebellum.

Anatomy

The tentorium cerebelli is a connective tissue forming the inner layer (lamina interna) the dura mater ( dura mater). It covers rooflike the posterior cranial fossa ( posterior fossa ) and is located in the fissure transversa cerebri ( formerly known as fissure telencephalicodiencephalis called ).

The cerebellum tent is stretched sideways on between the temporal bone and the transverse sinus. It is posterior to the internal occipital protuberance, fixed on both sides laterally at the edges of the sulcus sinus transversi and rostral to the Margo superior petrous pyramid and feeds near the petrous apex on the Impressio trigemini away, from there runs medially sellae to the dorsum, where it the posterior clinoid process and further rostral with a spur of the anterior clinoid process achieved. On these structures, it forms the so-called plicae petroclinoideae anterior and posterior. At the sulcus sinus transversus the root of the tentorium includes the transverse sinus and the upper edge of the petrous sinus superior petrosal. Medial, between the legs of the tentorium, as the notch tentorial ( tentorial notch ) designated structure is formed, through which pulls the mesencephalon with the posterior cerebral arteries, Nervi Nervi trochleares and oculomotorii. Line the bottom of the dorsum sellae Tentoriumschlitzes forms. The notch is tentorii sphenoid rostrally from Os limited and forms the only link between the supratentorial ( located above the tentorium ) and the infratentorial ( located below the tentorium ) space in their Subarachnoidealräumen cerebrospinal fluid is located.

Is the junction between the falx cerebri and tentorium cerebelli, which was also the sinus rectus is located on the center line of the tent ridge. Together with the falx cerebri, the cerebellum forms a tent Zuggurtungssystem, which mechanically stabilizes the skull cap from the inside. Here, the tentorium cerebelli carries the dorsal half of the telencephalon and thus prevents its pressure on the cerebellum. Through this system, larger mass shifts of the brain in trauma and deformities can be prevented and reduced lacerations of brain structures.

Peculiarities in animals

The anatomical structure of the tentorium cerebelli occurs regularly in birds and mammals but not in fish, amphibians and reptiles. The morphology of this, however, differs among species: whereas some smaller mammals such as bats, guinea pig, hamster, mouse, opossum and rat only a bilateral symmetrical cerebral membrane partition is that merely separates the lateral parts of the cerebellum and the cerebrum from each other, so are in larger mammals, such as cats, dogs, deer, goats, dolphins etc. unites these meningeal partitions and form a kind of diaphragm, which separates the posterior portions of the cerebral hemispheres from the cerebellum and leaving free only a passage point for the brainstem.

In many mammals, the cerebellum tent also consists of a bony part. This is referred to in horses and predators tentorium cerebelli ossium, in pigs and ruminants eminence cruciformis. The connective tissue section membranous cerebellum tent ( tentorium cerebelli membranaceum ) is then called. It originates in horses, cattle, dogs and cats at Crista petrosa, in swine, at the crest squamosa. The partial ossification of tentorium in many animal species, caused by the covering bones, done with the involvement of the apex, intermediate parietal and occipital bone.

Pathology

Through space-occupying processes in the supra - or infratentorial space it can be used to protrusion of brain proportions ( often uncus and parahippocampal gyrus ) may occur, which clamp in the notch of cerebellum ( upper axial herniation ). As a consequence, may also create a stenosis of the mesencephalic aqueduct and a compression of the mesencephalon occur. Without neurosurgical relief of this process for the patient runs usually fatal.

In rare cases of vitamin D intoxication or illnesses, such as the secondary or tertiary hyperparathyroidism and pseudoxanthoma elasticum, described calcification in the region of the tentorium.

Swell

• Cerebellum
• Meninges