In Other Animals
In fishes, the meninges is a single membrane (the primitive meninx). In amphibians, reptiles and birds, the meninges include a thick outer dura mater and a thick inner secondary meninx. Mammals retain the dura mater, and the secondary meninx divides into the arachnoid and pia mater.
Read more about this topic: Meninges
Famous quotes containing the word animals:
“Man’s unique reward, however, is that while animals survive by adjusting themselves to their background, man survives by adjusting his background to himself.”
—Ayn Rand (1905–1982)