noun
brain tissue
Medical and biological term for the cellular material that makes up the brain.
脳組織の損傷は深刻な障害を引き起こすことがある。
Damage to brain tissue can cause serious impairment.
研究者はマウスの脳組織を顕微鏡で観察した。
The researchers observed the mouse brain tissue under a microscope.
組織 means 'tissue' (biological) or 'organization' (group); 脳組織 narrows it to brain tissue.
Compound of 脳 (のう, 'brain') and 組織 (そしき, 'tissue'). The reading is standard on'yomi.