<Tr> <Th> FMA </Th> <Td> 74869 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of neuroanatomy (edit on Wikidata) </Td> </Tr> <P> The interthalamic adhesion (also known as the massa intermedia or middle commissure) is a flattened band of tissue that connects both parts of the thalamus at their medial surfaces . The medial surfaces form the upper part of the lateral wall to the third ventricle . </P> <P> In mammals other than humans, it is a large structure . In humans it is only about one centimetre long, though In females it is larger by about 50%. Sometimes it is in two parts and 20% to 30% of the time it is absent . </P>

What is the intermediate mass of the brain