Cytoplasm
In cell biology, the cytoplasm is all of the material within a cell, enclosed by the cell membrane, except for the cell nucleus. The material inside the nucleus and contained within the nuclear membrane is termed the nucleoplasm. The main components of the cytoplasm are cytosol – a gel-like substance, the organelles – the cell's internal sub-structures, and various cytoplasmic inclusions. The cytoplasm is about 80% water and usually colorless.
Nucleus incertus
The nucleus incertus has a bilateral structure which sits near the brainstem, and is often also called 'nucleus O'. It consists of mostly ascending GABAergic projection neurons and glutamatergic neurons which innervate a broad range of forebrain regions involved in behavioural activation and the response to stress.