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Question

Which one of the following meninges is present only in mammalian brain?

A
Dura mater
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B
Arachnoid
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C
Pia mater
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D
None of the above
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Solution

The correct option is B Arachnoid
Surrounding the adult brain are layers of mesodermally-derived connective tissue, called as meninges. Whereas cyclostomes and fishes only have a single envelope called as the primitive meninx, amphibians have two layers, consisting of an outer dura mater, which is extremely dense and protective, and a pia-arachnoid or secondary meninx, which is more delicate and vascular. They do not have a separate arachnoid layer.
Mammals have three meninges: pia mater, the arachnoid layer (which is delicate and sends strands to the pia mater) and the dura mater (the outer, more protective meninx).

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