Test: Central Nervous System (September 16) - NEET MCQ

In each segment of the spinal cord a spinal nerve arises from each side of the cord. Each spinal nerve connects with the cord through two nerve roots. The dorsal nerve root consists of a bundle of sensory axons (carrying afferent information) whose cell bodies are located in the dorsal root ganglion.

Both cerebral hemispheres are of the same size. Both function equally but left hemisphere is considered dominant because in majority of people Wernicke's and Broca's areas are located in the left hemisphere. Also majority of people are right-handed.

Broca's area is the motor speech area lying in the frontal lobe of cerebrum. It controls the movement of lips, tongue and larynx (vocal cords) to produce speech.

Medulla oblongata is the posterior most part of the brain. It has respiratory centre to contro respiration and cardiac centre to control cardiac activity.

The dorsal portion of the midbrain consists of four rounded lobes called quadrigemina.

Pons is located in front of the cerebelum below the mid brain and above the medulla oblongata. It consists of nerve fibres that connect the two hemispheres of cerebellum.

Hypothalamus is present at the floor of the diencephalon of the fore brain.

Corpora quadrigemina are euivalent to optic lobes (Corpora bigemina) of lower animals.

Occipital lobe is concerned with decoding and interpretation of visual information, shape and colour. Thus, if occipital lobe is damaged, vision will be lost.

Regulation of gastric secretion is also done by medulla oblongata.