An infolding of the dura lining the skull forms a near-complete membrane that separates the lowermost part of the cranial cavity – the posterior fossa

During development, inside the womb, the skeletal parts of the spine grow at a faster rate than does the spinal cord. This differential rate of

This Latin word means a sheath, or sleeve. It refers to the tube of dura that lines the spinal canal, retaining within it the spinal

From the Greek, meaning referring to the chest. In neurological practice we are usually referring to that part of the spine that runs down the

In everyday speech a piece of tissue is a thin sheet of paper, used to wrap a present or, in a slightly different form, to

The word ectopia, from the Greek, means “out of position”. Tonsillar ectopia is another term for tonsillar herniation, avoiding use of the eponymous term Chiari

An anatomical state in which the tonsils of the cerebellum protrude, to an abnormal degree, through the foramen magnum at the base of the skull,

Blowing out with lips and nostrils closed, causing the ears to pop – such as we might do as an aeroplane descends from a height.

An Italian physician, living in the17th century, who first described the manoeuvre that now bears his name.

Occasionally, special radiological investigations reveal that somebody has a narrowing of one of the main venous channels in the head, draining blood from the brain.