Biology Homework Help: Questions and Answers: What is the inner layer of the meninges containing blood vessels?
A) pia mater
B) arachnoid mater
C) dura mater
D) spider mater
Answer:
First, let’s understand about meninges?
The meninges are three protective layers that surround the brain and spinal cord. These layers help protect the central nervous system from injury.
The three layers of the meninges:
- Dura mater: The outermost layer, tough and thick, providing the most protection.
- Arachnoid mater: The middle layer, web-like in structure, and it serves as a cushion for the brain.
- Pia mater: The innermost layer, which directly covers the brain and spinal cord. This layer contains many blood vessels that supply oxygen and nutrients to the brain.
Given Options: Step by Step Answering
a) pia mater
- The pia mater is rich in blood vessels and tightly adheres to the surface of the brain and spinal cord. It plays a key role in nourishing the brain by transporting blood to the nervous tissue.
b) arachnoid mater
- While it has space beneath it (the subarachnoid space) where cerebrospinal fluid circulates, it doesn’t directly contain blood vessels like the pia mater.
c) dura mater
- While protective, it is not the layer rich in blood vessels.
d) spider mater
- This is not a valid term in anatomy
Final Answer
Based on the above analysis, the correct answer is:
a) pia mater
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