Week 2

Shona touches a hot stove accidentally and quickly pulls away. Which skins receptors are responsible for her reaction?

• Merkel’s discs

• Free nerve endings

• Ruffini’s endings

• Meissner’s corpuscles

What structure is labeled with an F?

• Medial lemniscus

• Nucleus gracilis

• Nucleus cuneatus

• Thalamus

In this image, the primary somatosensory cortex is shown in blue. The letters indicate potential damage to the area underlying each letter. Based on your knowledge of somatotopic mapping of the primary somatosensory cortex, which injury would result in sensory issues of the upper extremity?

• A

• B

• C

• D

Where are the cell bodies of second-order sensory neurons in the pain pathway located?

• Ventroposterior nucleus of the thalamus

• Zone of Lissauer

• Dorsal column nuclei

• Dorsal horn of the spinal cord

Where does decussation of the discriminative pain pathway occur?

• Midbrain

• Spinal cord

• Medulla

• Thalamus

What is the area of skin whose axons converge on the same secondary neuronal body?

• Cutaneous nerve distribution

• Dermatome

• Receptive field

• Homunculus

Which one of the following statements about golgi tendon organs is FALSE?

• Golgi tendon organs are arranged in series with muscle fibers

• Golgi tendon organs are also called 1b afferents

• Golgi tendon organs provide information on joint position

• Golgi tendon organs are measuring muscle load

• Golgi tendon organs activation triggers muscle responses slower than muscle spindle activation

Which statement best describes astereognosis?

• Holding a paperclip but believing it is a staple

• Holding a 2-lb weight but believe it to be 10-lbs

• Scenting a freshly baked cookie when it is actually pizza

• Understanding the words spoken, but not able to articulate words

In the image above, what is the function of the structure labeled H?

• Process somatosensory signals to the upper half of body and arms

• Process somatosensory signals to the lower half of body and legs

• Carries unconscious proprioceptive input from the body to the cerebellum

• Carries information regarding pain and temperature to the brain

There is a sharp edge to Katie’s heel of her shoes, rubbing over the insertion of the Achilles’ tendon to the calcaneus. Which spinal root senses this rubbing?

• L2

• L3

• L4

• L5

• S1