A anesthesia iwi kuamoʻo he anesthesia o ke kino lalo. Loaʻa iā ia i ke komo pono ʻana i kahi anesthetic i loko o ka ka wai o ka maʻi (CSF), ka wai e hoʻopuni ana i ka ka lāʻauʻala, ma ka pae o ka hope haʻahaʻa ma waena o nā vertebrae lumbar ʻelua. ʻO ia kahi ʻano anesthesia e hoʻohana ākea ʻia i ke ʻoki kino.

ʻAno like ka anesthesia iwi kuamoʻoanesthesia epidural, akā ʻaʻole e hana ka ʻume o ka anesthetic i ka "compart" like.

ʻOiaʻiʻo, aia nā membrane 3 a puni ka ʻōnaehana hopohopo waena (ʻo kēia nā meninges):

• la dura mater
• kaarachnoid
• la pia mater

Hoʻopau kēia i nā wahi ʻelua: wahi epidural a me kahi subarachnoid (ma waena o ka arachnoid a me ka pia mater, i loaʻa ka CSF),

Pili ke anesthesia iwi kuamoʻo i ka anesthetic i loko o ka subarachnoid space, ʻoiai ka anesthetic, i ka wā epidural, ʻaʻole e hele i ka dura (membrane pale o ka wai cerebrospinal).