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The cerebellar tonsils move downward through the foramen magnum, a natural opening at the base of the skull where the spinal cord connects to the brain.
Increased pressure in the posterior fossa forces the cerebellar tonsils through the foramen magnum. These will compress the lower part of the brain stem and upper cervical cord, resulting in life-threatening consequences.
Brain herniation is a potentially deadly side effect of very high pressure within the skull that occurs when a part of the brain is squeezed across structures within the skull. The brain can shift across such structures as the falx cerebri, the tentorium cerebelli, and even through the foramen magnum (the hole in the base of the skull through ...
Usually, tonsillar herniation is caused by an expanding infratentorial mass (eg, cerebellar hemorrhage). The cerebellar tonsils, forced through the foramen magnum, compress the brain stem and obstruct cerebrospinal fluid (CSF) flow.
Tonsillar herniation: Also known as cerebellar tonsillar herniation, this type involves the downward displacement of the cerebellar tonsils through the foramen magnum (the large opening at the base of the skull). This can put pressure on the brainstem and spinal cord, leading to life-threatening complications.
The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord. On either side of the foramen magnum is an occipital condyle. These condyles form joints with the first cervical vertebra.
If you don’t have enough room in your skull, part of your brain, specifically your cerebellum, will grow downward where there’s extra space in an opening at the base of your skull — called the foramen magnum. Your cerebellum is the part of your brain that helps with your muscle movements, posture, balance, speech and coordination.
OVERVIEW. Brain herniation is the displacement of part of the brain through an opening or across a separating structure into a region that it does not normally occupy. TYPES. Supratentorial. 1. Uncal transtentorial herniation. 2. Central tentorial herniation. 3. Subfalcine herniation. 4. Transcalvarial herniation. Infratentorial. 5.
Tonsillar herniation: A mass in the infratentorial area of the brain forces the cerebellar tonsils, small structures at the base of the brain, through the foramen magnum, an opening in the...
Tonsillar herniation: A mass (tumor or bleeding) in the lower part of the brain pushes the lowest part of the cerebellum (cerebellar tonsils) through the opening at the base of the skull (foramen magnum). As a result, the brain stem, which controls breathing, heart rate, and blood pressure, is compressed and malfunctions.