Where does “microcerebral” come from?

microcerebral (English) comes from English cerebral, from French cérébral, from Latin cerebrum, from Proto-Italic kerazrom, from Proto-Indo-European ḱerh₂-s-ro, from Proto-Indo-European ḱerh₂- — head, top; horn.

microcerebral (English): Both very small and cerebral

Definitions

Both very small and cerebral

Ancestry of “microcerebral”, step by step

microcerebral traces back through two separate lines of ancestry.

via English cerebral

Step	Language	Word	Meaning
1	English	cerebral	Of, or relating to the brain, cerebrum, or...
2	French	cérébral	cerebral; A cerebral person
3	Latin	cerebrum	brain; skull
4	Proto-Italic	kerazrom	brain
5	Proto-Indo-European	ḱerh₂-s-ro	—
6	Proto-Indo-European	ḱerh₂-	head, top; horn

via English micro

Step	Language	Word	Meaning
1	English	micro	Small, relatively small; short form of...
2	Ancient Greek	μικρός	little, small
3	Proto-Indo-European	mēy-	soft, tender, dear

Every word from Proto-Indo-European ḱerh₂- →Every word from Proto-Indo-European ḱerh₂-s-ro →Every word from Proto-Italic kerazrom →