脊せき髄ずい硬こう膜まく

Meanings

1

spinal dura mater

Anatomical term for the tough outermost membrane covering the spinal cord.

硬こう膜まく
硬膜 refers to the dura mater in general (both cranial and spinal), while 脊髄硬膜 specifically denotes the spinal dura mater.
脊せき髄ずい
脊髄 means 'spinal cord', the structure that 脊髄硬膜 surrounds.

Compound of 脊髄 (せきずい, 'spinal cord') and 硬膜 (こうまく, 'dura mater'). The term is a direct anatomical designation.