Question

Subarachnoid space is found in
A. Between pia mater and arachnoid mater
B. Dura mater
C. Blastocoel
D. None of the above

Answer 1

Hint: Brain is the central part of the human body and it also forms the human nervous system along with the spinal cord. Subarachnoid space is present in the brain and in the spinal cord. One of the spaces between the three meninges found in the brain is called subarachnoid space.

Complete answer:
Brain is the master organ of the human body. It controls all the activities of the human body by coordinating with the spinal cord. The membrane that develops the spinal cord and brain are called meninges. The word meninges refer to the membrane found in both the brain and spinal cord. The dura mater, the arachnoid mater, and the pia mater are the three meninges found in mammals are. The main primary function of meninges is to protect the spinal cord and the brain. The space between the arachnoid mater and pia mater is called subarachnoid space. This space is filled with cerebrospinal fluid (CSF) and continues down along the spinal cord. The dura mater in the spinal cord is separated from the vertebrae by a space called epidural space, whereas the dura mater is attached to the Skull. Subarachnoid cisterns which are filled with cerebrospinal fluid are the spaces formed by the openings at different points that are present along with the subarachnoid space. Therefore, Subarachnoid space is found between the arachnoid mater and pia mater.
So, option A is the correct answer.

Note: Injury or damages to the meninges cause subarachnoid haemorrhage that is acute bleeding under the arachnoid. Bleeding between the dura mater and the skull is called epidural hematoma which can arise spontaneously or after an accident.