Brain anatomy, function, and neuroscience.
Test your knowledge with these top questions!
Which ion enters an axon terminal to trigger neurotransmitter release at a chemical synapse?
Calcium entry makes synaptic vesicles fuse with the terminal membrane and release neurotransmitters into the cleft.
Prism glasses shift vision sideways. Which process helps a reach adjust?
The cerebellum helps recalibrate a reach when shifted vision makes the hand miss its target.
Which three-layer membrane system wraps the brain beneath the skull?
Beneath the skull, the dura mater, arachnoid, and pia mater form the three meningeal layers.
Which nerve-fiber bundle mainly links the left and right cerebral hemispheres?
The corpus callosum uses about 200 million fibers to transfer sensory, motor, and cognitive signals.
Which structure relays most sensory information to the cerebral cortex?
Smell is the classic exception: olfactory signals can reach the cortex without first passing through the thalamus.
Which major brain region connects the cerebrum to the spinal cord and helps regulate breathing and heartbeat?
The medulla, one part of the brainstem, contains centers that adjust breathing, heart rate, and blood pressure.
Which brainstem network helps maintain wakefulness and alertness?
Its ascending signals activate higher brain regions, helping the brain shift into focused wakefulness.
Which major brain region helps route sensory information and regulate hunger, thirst, and sleep?
The diencephalon includes the thalamus, a sensory relay, and the hypothalamus, which helps maintain body balance.
Sensory fibers from the body enter the spinal cord through which structure?
The nearby dorsal root ganglion holds sensory neuron cell bodies before their fibers enter the cord.
Broca's area in the dominant frontal lobe most directly supports which ability?
Damage to Broca's area can produce slow, effortful speech even when the muscles for speech still work.