Question

Cerebrospinal fluid is present
(a) Beneath the pia mater
(b) Between pia mater and arachnoid mater
(c) Between arachnoid and dura mater
(d) In extra dura mater
(e) Between the dura mater and cranium

Answer 1

Hint Brain is the anterior part of the cranial nervous system protected by cranial bones. Brain covered by three internal protective covers on the surface called cranial meanings which consist of fluid to protect the brain from mechanical injury.

Complete Answer:
The cerebrospinal fluid is present inside the subarachnoid space. The space between the arachnoid membrane and pia mater is called subarachnoid space.
Duramater, arachnoid, and pia mater from cranial meninges. Dura Mater from the outer tough fibrous layer attaches closely to the inside layer of the cranium. Piamater is an inner thin, delicate vascular layer attached with brain tissue and arachnoid is a thin network layer present middle to dura mater and pia mater.

Additional information:
Cerebrospinal fluid is a clear, colorless extracellular fluid circulate continuously through brain ventricles, the central canal of the spinal cord, and in subarachnoid space. It is similar to plasma but the proportion of protein and cholesterol is less. It protects the brain and spinal cord from the shock-absorbing medium, it provides buoyancy by reducing the weight of the brain from 1.4 kg to 0.18 kg, it excretes out harmful drugs and waste products and it also carries hormones to a different site of the brain. The four cavities in the brain are called brain ventricles. Two lateral ventricles located in the hemisphere of the cerebrum, the third ventricle is a vertical slit between the hemisphere through the area of the thalamus. Fourth ventricles lie between the brainstem and cerebellum. The third and fourth ventricle is connected through a narrow slit cerebral aqueduct and the fourth ventricle is continuous with the spinal cord.

So, the correct answer is pia mater and arachnoid mater.

Note: Pia mater also consists of blood vessels that supply the underlying surface of the brain. Pia mater forms perivascular space for the extension of a blood vessel inside the underlying neural tissue.