QCM : Neuroscience Fundamentals — 9 questions

Explication

Dendrites are the structures on a neuron that receive incoming signals from other neurons or sensory receptors. They conduct the electrical signals toward the cell body (soma).

Explication

The thalamus is known as the relay station for sensory information, transmitting signals to the cerebral cortex for processing. The cerebellum coordinates movement, the hypothalamus regulates autonomic and endocrine functions, and the medulla manages vital autonomic functions, but none serve as the primary relay for sensory signals.

Explication

The corticospinal tract is a major descending pathway that transmits motor commands from the cerebral cortex to the spinal cord, thereby controlling voluntary muscle movements.

Explication

There are 31 pairs of spinal nerves in the PNS, arising from the spinal cord, whereas there are 12 pairs of cranial nerves. The numbers reflect the segmentation of the nervous system.

Explication

The vestibulocochlear nerve (cranial nerve VIII) is responsible for transmitting sound (hearing) and balance information from the inner ear to the brain.

Explication

The dorsal horn of the spinal cord mainly processes sensory signals received from afferent neurons, such as pain and proprioception. Motor signals involve the ventral horn, and autonomic functions are associated with the lateral horn.

Explication

The vestibulocochlear nerve (cranial nerve VIII) transmits auditory (hearing) and vestibular (balance) information, making it essential for hearing functions.

Explication

The resting potential of a neuron is approximately -70 mV, which is the electrical potential difference across the neuron’s membrane in a resting state, maintained by ion gradients.

Explication

The spinothalamic tract is responsible for transmitting pain and temperature sensations from the spinal cord to the brain, whereas dorsal columns carry fine touch and proprioception.