| Brain: Tentorium cerebelli | ||
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| Tentorium cerebelli seen from above. | ||
| Gray's | subject #193 874 | |
| Part of | Meninges | |
| NeuroNames | ancil-261 | |
The tentorium cerebelli or cerebellar tentorium (Latin: "tent of the cerebellum") is an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes. This is a list of the subjects in Gray's Anatomy: IX Neurology The meninges (singular meninx) is the system of membranes which envelops the Central nervous system. NeuroNames is a system of nomenclature for the human and/or macaque Brain. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. The cerebellum ( Latin: "little brain" is a region of the Brain that plays an important role in the integration of sensory perception The dura mater (from the Latin "hard mother" or pachymeninx, is the tough and inflexible outermost of the three layers of the Meninges surrounding the The occipital lobe is the visual processing center of the Mammalian Brain containing most of the anatomical region of the Visual cortex.
Contents |
Anatomy
The tentorium cerebelli is an arched lamina, elevated in the middle, and inclining downward toward the circumference.
It covers the superior surface of the cerebellum, and supports the occipital lobes of the brain. The occipital lobe is the visual processing center of the Mammalian Brain containing most of the anatomical region of the Visual cortex.
Its anterior border is free and concave, and bounds a large oval opening, the incisura tentorii, for the transmission of the cerebral peduncles.
It is attached, behind, by its convex border, to the transverse ridges upon the inner surface of the occipital bone, and there encloses the transverse sinuses; in front, to the superior angle of the petrous part of the temporal bone on either side, enclosing the superior petrosal sinuses. For the transverse pericardial sinus see Pericardial sinus. The transverse sinuses (left and right lateral sinuses within a human head The temporal bones are situated at the sides and base of the Skull. The superior petrosal sinus is a venous structure located beneath the brain
At the apex of the petrous part of the temporal bone the free and attached borders meet, and, crossing one another, are continued forward to be fixed to the anterior and posterior clinoid processes respectively.
To the middle line of its upper surface the posterior border of the falx cerebri is attached, the straight sinus being placed at their line of junction. The falx cerebri, also known as the cerebral falx, so named from its sickle-like form is a strong arched fold of dura mater which descends vertically in the longitudinal fissure
Clinical significance
Clinically, the tentorium is important because brain tumors are often characterized as supratentorial (above the tentorium) and infratentorial (below the tentorium). See also Cancer A tumor or tumour is the name for a swelling or lesion formed by an abnormal growth of cells (termed neoplastic The location of the tumor can help in determining the type of tumor, as different tumors occur with different frequencies at each location. Additionally, most childhood tumors are infratentorial, while most adult tumors are supratentorial. The location of the tumor may have prognostic significance as well. Prognosis (older Greek πρόγνωσις modern Greek πρόγνωση - literally fore-knowing foreseeing) is a medical term denoting the
Since the tentorium is a hard structure, if there is a volume expansion in the parenchyme above the tentorium, the brain can get pushed down partly through the tentorium. This is called herniation and will often give mydriasis on the affected side, due to pressure on cranial nerve III (N. Oculomotorius). Tentorial herniation is a serious symptom, especially since the brainstem is likely to be compressed as well if the intracranial pressure rises further.
Additional images
 Dura mater and its processes exposed by removing part of the right half of the skull, and the brain. |
 Sagittal section of the skull, showing the sinuses of the dura. |
_description.JPG/120px-Human_brain_dura_mater_(reflections)_description.JPG) Human brain dura mater (reflections) |
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. Indiana University, founded in 1820, is a nine-campus University system in the state of Indiana. The University of Michigan Ann Arbor ( U of M, U-M, UM or simply Michigan) is a top-ranked Coeducational public research The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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