Block 4 HW/Lab Questions Flashcards
what neuron brings stimulus from muscle to CNS
afferent sensory neuron
Which type of sensory receptor allows us to feel an insect landing on our skin?
mechanoreceptor
__________ are receptors that can respond to painful stimuli.
nociceptors
Which of the following is the best explanation of how a stimulus’s strength is transmitted to the central nervous system from sensory nerves?
action potential frequency is increased as stimulus strength increases
Visceral or organ pain is generally dull, diffuse and difficult to localize. Most viscera (organs) are not mapped in the somatosensory cortex and often pain from these organs can be felt in a nearby area of the body. For instance, heart attacks are often felt as pain radiating down the medial aspect of the left arm. This phenomenon is known as:
referred pain
Ascending pathways conduct sensory information upward toward the brain, typically through a relay chain of 3 successive neurons. The neurons in these sensory pathways are called the first-order, second-order and third-order neurons, respectively. Select the true statement regarding first-order neurons in somatosensory pathways
first-order neuron cell bodies reside in a ganglion
We can touch our finger to our nose while our eyes are closed in part because we can sense the position and movement of our joints as well as the length of stretch in our muscles. This awareness of our body’s position in space is called
proprioception
Spinocerebellar tracts ________.
carry information about muscle or tendon stretch to the cerebellum
The somatosensory pathway that conveys information to the brain about temperature and pain is the ________.
spinothalamic
What ascending pathway has first order neurons that synapse in the nucleus gracilis or nucleus cuneatus?
dorsal columns-medial lemniscus
