Which one of the following menix is present only in mammalian brain :-a)Duramaterb)Arachnoidc)Piamaterd)None of themCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

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 2 layers , consisting of an outer duramater, which is extremely dense and protective and other pia arachnoid or secondary meninx , which is more delicate and vascular. They do not have a separate arachnoid layer.
Mammals have 3 meninges: pia mater , the arachnoid layer ( which is delicate and sends strand to the pia mater ) and the dura mater ( the outer, more protective meninx ).

Answer

Option B is correct becose mammals brain mainly contains tree meninges.. outer durameter ,middle archinoid mater, inner pia meter.. the space between durameter and arachenoid meter is called subdural space.. this space contains ceribro spinal fluid ..space between archinoid mater and pia meter is called subarchenoid space.. presence of arachenoid meter is the character stick of mammals.. it is only present mammals not any other animals..

Answer

Arachnoid is present only in mammalian brain

The three meninges (protective membranes) that surround the brain and spinal cord are the dura mater, arachnoid, and pia mater. Each layer serves a different function in protecting the brain from injury and infection.

Dura Mater:
The dura mater is the outermost layer of the meninges and is made up of tough, fibrous tissue. It provides a barrier between the brain and the skull, protecting the brain from injury.

Pia Mater:
The pia mater is the innermost layer of the meninges and is a delicate, thin layer of tissue that covers the surface of the brain and spinal cord. It provides a protective barrier that helps prevent infections and injuries from reaching the brain.

Arachnoid:
The arachnoid is the middle layer of the meninges and is a thin, web-like membrane that lies between the dura mater and the pia mater. It serves as a cushion for the brain and spinal cord, protecting them from sudden movements and impacts.

Conclusion:
Out of these three meninges, arachnoid is present only in mammalian brain. It is absent in other animals like birds, reptiles, and amphibians. The arachnoid layer is a unique feature of the mammalian brain that provides an additional layer of protection to the brain and spinal cord.

Answer

The arachnoid mater is one of the three meninges, the protective membranes that cover the brain and spinal cord. The arachnoid mater is a derivative of the neural crestmesectoderm in the embryo(plu. manix).

Answer

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 2 layers , consisting of an outer duramater, which is extremely dense and protective and other pia arachnoid or secondary meninx , which is more delicate and vascular. They do not have a separate arachnoid layer.
Mammals have 3 meninges: pia mater , the arachnoid layer ( which is delicate and sends strand to the pia mater ) and the dura mater ( the outer, more protective meninx ).

Answer

Arachnoid is net like covering of brain it's second layer of menix and it is characteristics feature of mammals because it is present only in mammals not any other

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