Assertion: malleus's head | /r/MadeOf | central core of bone marrow
Facets:
value: in infancy
type: TEMPORAL
value: normally
type: DEGREE
Source sentences:
text: Although the incus and malleus grow to adult size by 16 weeks of fetal life and ossification of the two ossicles begins at this age,1-4 it is known that in infancy the head of the malleus and body of the incus normally contain a central core of bone marrow, which is gradually replaced by bone and converted into vascular channels in early childhood.