Question

Spinal cord passes through
A. Foramen of Monro
B. Iter
C. Obturator foramen
D. Foramen magnum

Answer 1

Hint: Our brain is the central nervous system which helps the body to coordinate its parts. There are various openings in the skull called foramen/canals which give passage to various arteries, veins. The spinal cord is the part of the central nervous system.

Complete answer:
The spinal cord is located in the vertebral canal of the backbone or vertebral column which is protected by the bony arch. It originates from the last part of the hindbrain called the medulla oblongata which passes out of the cranium through a hole called foramen magnum and joins the spinal cord. This spinal cord extends from the medulla oblongata to the second lumbar vertebrae.
The foramen magnum is a large ovoid opening/foramina in the base of the skull. The spinal cord which is an extension of the medulla oblongata of the brain stem passes through the foramen magnum as it exits the posterior cranial cavity. The layer of meninges also passes through it. The foramen magnum also transmits the vertebral arteries, the anterior and posterior spinal arteries, the tectorial membranes and alarm ligaments. It also transmits the spinal accessory nerve into the skull.
Foramen magnum is a connection between the brain and the spinal cord. It functions as a passage for the central nervous system. It is located in the occipital bone in the brain separating the brain and spinal cord. This anteriorly located part of the brain is a large oval opening in the skull. It is an important feature in bipedal mammals.

Hence, the correct answer is option (D).

Note: The foramen magnum is the skulls biggest foramen which forms part of the occipital bone. With a wide anteroposterior diameter, it is oval in shape. As the opening narrows, Foramen magnum stenosis occurs, causing pressure on the spinal cord.