A nrịanrịa akwara bụ a ahu izizi nke ahụ dị ala. Ọ gụnyere ịgbanye ọgwụ anestetiiki n'ime mmiri ọgwụ (CSF), mmiri gbara ya gburugburu ọkpụkpụ azụ, n'ogo nke azụ ala azụ n'etiti lumbar vertebrae abụọ. Ọ bụ ụdị anesthesia a na -ejikarị eme ihe n'ịwa ahụ.

Ọkpụkpụ azụ azụ yiri yanrịanrịa epidural, mana ịgba ọgwụ anestetiiki anaghị eme n'otu "ngalaba".

N'ezie, enwere membranes 3 gburugburu sistemụ akwara (ndị a bụ meninges):

• la dura mater
• naarachnoid
• la pia mater

Ndị a na -ekewa oghere abụọ: oghere epidural na ohere subarachnoid (n'etiti arachnoid na pia mater, nke nwere CSF),

Anesthesia spinal gụnyere ịgbanye ọgwụ anestetiiki n'ime oghere subarachnoid, ebe anestetiiki, n'oge epidural, anaghị agafe dura (akpụkpọ ahụ na -echebe mmiri mmiri mmiri mmiri).