WordNet

on or outside the dura mater (同)extradural

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/11/05 21:25:13」(JST)

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In the spine, the epidural space (from Ancient Greek ἐπί, "on, upon" + dura mater also known as "epidural cavity", "extradural space" or "peridural space") is an anatomic space that is the outermost part of the spinal canal. It is the space within the canal (formed by the surrounding vertebrae) lying outside the dura mater (which encloses the arachnoid mater, subarachnoid space, the cerebrospinal fluid, and the spinal cord). In humans the epidural space contains lymphatics, spinal nerve roots, loose connective tissue, fatty tissue, small arteries, and a network of internal vertebral venous plexuses.^{[citation needed]}

In humans

The upper limit of the epidural space is the foramen magnum, which is the point where the spine meets the base of the skull. The lower limit is at the tip of the sacrum, at the sacrococcygeal membrane.

In the head, the epidural space is known as a potential space. In rare circumstances, a torn artery (e.g. the middle meningeal artery) may cause bleeding which is sufficient to create epidural space; this is an epidural hematoma.

The space between the dura and the arachnoid (in both head and spine), the subdural space, is also a potential space. Bleeding may also occur here.

In other mammals

In other mammals, the relationship between the spinal canal and its contents is similar to that in humans, although many species possess a tail into which the epidural space is prolonged.

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English Journal

[Contrast medium visualization of the cavum epidurale via Dimer X (peridurography) (author's transl)].

Grill F, Polt E.AbstractThe term "peridurography" stands for visualization of the cavum epidurale via a water-soluble contrast medium. The article reports on the technique and indication. The experience collected on the basis of 93 peridurographies effected by the authors justify the assumption that this method can be considered as reliable in the diagnosis of prolapsed vertebral disk.
Zeitschrift für Orthopädie und ihre Grenzgebiete.Z Orthop Ihre Grenzgeb.1979 Feb;117(1):119-24.
The term "peridurography" stands for visualization of the cavum epidurale via a water-soluble contrast medium. The article reports on the technique and indication. The experience collected on the basis of 93 peridurographies effected by the authors justify the assumption that this method can be cons
PMID 371175

「硬膜上腔」

Epidural space
	The medulla spinalis and its membranes
Details
Identifiers
Latin	Spatium epidurale,; spatium extradurale,; cavum epidurale
TA	A14.1.01.112
FMA	71228
	Anatomical terminology [edit on Wikidata]