Question

Select the wrongly matched pair:

• A. Cerebral aqueduct - Canal passes through the mid brian
• B. Corpora quadrigemina - Lobes in the dorsal portion of mid brain
• C. Arachnoid - Inner layer of cranial meninges
• D. Corpus callosum - Connects cerebral hemispheres

Answer 1

Answer:

C. Arachnoid - Inner layer of cranial meninges

The arachnoid is the middle layer of the cranial meninges, not the inner layer. The arachnoid is the middle layer of the meninges, a set of three membranes that protect the brain and spinal cord. The arachnoid is a thin, web-like membrane that sits between the dura mater and the pia mater. It's avascular, meaning it doesn't contain blood vessels or nerves. The arachnoid is involved in cerebrospinal fluid (CSF) metabolism and contains arachnoid villi, which help reabsorb CSF into venous blood.