subarachnoid space


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Related to subarachnoid space: Subarachnoid hemorrhage

subarachnoid space

[¦səb·ə′rak‚nȯid ¦spās]
(anatomy)
The space between the pia mater and the arachnoid of the brain.
References in periodicals archive ?
1) The abnormal communication with the subarachnoid spaces might involve the cochlear duct or internal auditory canal.
SAH involves bleeding into the subarachnoid space between the arachnoid mater and the pia mater, from a brain lesion, ruptured aneurysm or trauma.
The insertion of the catheter at the subdural level leads to the spread of the anesthetic to the subarachnoid space, leading to a sensory block that affects the more cephalic metameres for the volume and concentration used with a variable motor effect and even cardiorespiratory arrest.
In turn, HARM might be able to reveal traces of a preceding vessel occlusion and hypoperfusion causing blood-brain barrier disruption and leakage of gadolinium contrast in the subarachnoid space but not necessarily a detectable ischemic lesion.
The subarachnoid space is accessible through median and paramedian techniques in sitting or lateral position [2].
Subarachnoid space width was in normal range (Figure 3).
4, 5) Myodural biofeedback may play a role in maintaining the integrity of the subarachnoid space.
The total volume of CSF in the central nervous system is approximately 160 ml, with 120 ml residing in the subarachnoid space, and the remainder found in the ventricular system; mammalian CSF is turned over almost four times each day; however, this decreases with ageing.
4,5) Although the term dural ectasia is preferred to describe the optic nerve sheath dilation, optic hydrops, primary cyst of the optic nerve sheath, patulous subarachnoid space, cystic hygroma, arachnoid cyst, and perioptic subdural hygroma terms were all used to describe this entity since its first description in 1918.
In the ETV, there is no CSF diversion to outside of the subarachnoid space, which conveys the idea that hyperdrainage would not occur and consequently the formation of a subdural hygroma would be very unlikely (8,11).
If the vessel lies in the subarachnoid space, the haemorrhage is referred to as a subarachnoid haemorrhage (SAH).