Somatosensation Flashcards
1
Q
- Which type of receptor is responsible for fine and discriminative touch?
a) Ruffini corpuscles b) Meissner’s corpuscles c) Pacinian corpuscles d) Merkel discs
A
b) Meissner’s corpuscles
2
Q
- What is the primary function of the DCML pathway?
a) Transmitting temperature and pain b) Discriminative touch and proprioception c) Modulating crude touch and pressure d) Coordinating muscle contraction
A
b) Discriminative touch and proprioception
3
Q
- If there is damage to the fasciculus gracilis, which sensory information is most affected?
a) Proprioception from the upper trunk b) Vibrations from the legs c) Temperature from the arms d) Pain from the lower body
A
b) Vibrations from the legs
4
Q
- Which nerve fiber type is responsible for transmitting sharp pain and crude touch?
a) Aα fibers b) Aβ fibers c) Aδ fibers d) C fibers
A
c) Aδ fibers
5
Q
- The fasciculus cuneatus carries sensory information from:
a) Below T6 (lower trunk and legs) b) Above T6 (upper trunk and arms) c) Both above and below T6 d) The face and neck only
A
b) Above T6 (upper trunk and arms)
6
Q
- Damage to the VPL nucleus in the thalamus would most likely result in:
a) Impaired motor activity b) Loss of somatosensory perception c) Loss of autonomic reflexes d) Impaired visual processing
A
b) Loss of somatosensory perception
7
Q
- Where do second-order neurons of the DCML pathway cross to the contralateral side?
a) Dorsal root ganglion b) Internal arcuate fibers in the medulla c) Posterior white column of the spinal cord d) Thalamus
A
b) Internal arcuate fibers in the medulla
8
Q
- Which receptor type is responsible for detecting vibration and pressure changes?
a) Merkel discs b) Ruffini corpuscles c) Pacinian corpuscles d) Meissner’s corpuscles
A
c) Pacinian corpuscles
9
Q
- A lesion affecting the medial lemniscus on the left side would cause:
a) Contralateral loss of fine touch and proprioception b) Ipsilateral loss of fine touch and proprioception c) Bilateral loss of crude touch d) Contralateral loss of temperature sensation
A
a) Contralateral loss of fine touch and proprioception
10
Q
- Which of the following is true about Type Aβ nerve fibers?
a) They transmit slow pain signals b) They are responsible for proprioceptive input c) They are myelinated and transmit touch signals d) They primarily transmit temperature signals
A
c) They are myelinated and transmit touch signals
11
Q
- Which structure is the primary destination of third-order neurons in the DCML pathway?
a) Thalamus b) Primary somatosensory cortex (S1) c) Brainstem d) Secondary somatosensory cortex (S2)
A
b) Primary somatosensory cortex (S1)
12
Q
- What is the function of the muscle spindle Type 1A fibers?
a) Detect progressive muscle stretch b) Detect vibration and skin stretch c) Detect onset of muscle stretch d) Detect muscle tension
A
c) Detect onset of muscle stretch
13
Q
- What happens to sensory signals from the right leg as they ascend through the spinal cord in the DCML pathway?
a) They cross at the level of the spinal cord b) They ascend ipsilaterally until the medulla c) They cross over in the thalamus d) They bypass the medulla entirely
A
b) They ascend ipsilaterally until the medulla
14
Q
- Damage to the corona radiata would most likely impair:
a) Visual processing b) Sensory input to the somatosensory cortex c) Motor output to the corticospinal tract d) Auditory processing
A
b) Sensory input to the somatosensory cortex
15
Q
- The internal capsule is supplied by which artery?
a) Anterior cerebral artery b) Posterior cerebral artery c) Middle cerebral artery d) Basilar artery
A
c) Middle cerebral artery
16
Q
- If the nucleus gracilis is damaged, which sensory function would be impaired?
a) Crude touch from the upper limbs b) Vibrations from the lower limbs c) Pain from the lower trunk d) Temperature from the arms
A
b) Vibrations from the lower limbs
17
Q
- Which receptor type detects skin stretch?
a) Ruffini corpuscles b) Merkel discs c) Meissner’s corpuscles d) Pacinian corpuscles
A
a) Ruffini corpuscles
18
Q
- How do second-order neurons in the DCML pathway ascend after crossing over in the medulla?
a) Via the medial lemniscus b) Through the posterior white column c) Via the spinothalamic tract d) Through the corticospinal tract
A
a) Via the medial lemniscus
19
Q
- Damage to the lenticulostriate arteries would most likely result in:
a) Sensory loss from the contralateral body b) Ipsilateral motor weakness c) Bilateral pain and temperature loss d) Visual field defects
A
a) Sensory loss from the contralateral body
20
Q
- The somatotopic arrangement of the postcentral gyrus places which body part medially?
a) Hands b) Feet c) Face d) Tongue
A
b) Feet
21
Q
- The fasciculus gracilis carries information from which part of the body?
a) Upper limbs and trunk b) Lower limbs and trunk c) Face and neck d) Only the hands
A
b) Lower limbs and trunk
22
Q
- A lesion at the dorsal column below T6 will result in loss of:
a) Proprioception in the arms b) Discriminative touch in the legs c) Pain and temperature sensation d) Motor output to the legs
A
b) Discriminative touch in the legs
23
Q
- The medial lemniscus forms after fibers cross at which location?
a) Internal arcuate fibers of the medulla b) Posterior column of the spinal cord c) Ventroposterior lateral nucleus d) Pyramidal decussation
A
a) Internal arcuate fibers of the medulla
24
Q
- Merkel discs are responsible for detecting:
a) Fine touch and superficial pressure b) Vibration and deep pressure c) Pain and crude touch d) Muscle stretch
A
a) Fine touch and superficial pressure
25
25. Which structure organizes sensory input before sending it to the cortex?
a) Spinal cord b) Thalamus c) Cerebellum d) Basal ganglia
b) Thalamus
26
26. A lesion to the right fasciculus cuneatus would cause loss of sensation on which side?
a) Right side b) Left side c) Bilateral d) No sensory loss
a) Right side
27
27. Golgi tendon organs detect:
a) Vibration changes b) Tension in tendons c) Crude touch d) Fine motor activity
b) Tension in tendons
28
28. The postcentral gyrus is responsible for:
a) Voluntary motor control b) Somatosensory processing c) Auditory processing d) Memory storage
b) Somatosensory processing
29
29. The internal arcuate fibers cross:
a) In the midbrain b) In the medulla c) At the spinal cord level d) At the thalamus
b) In the medulla
30
30. Which fiber type is unmyelinated?
a) Aα fibers b) Aβ fibers c) Aδ fibers d) C fibers
d) C fibers
31
31. Which type of nerve fiber is the fastest for transmitting proprioception?
a) Type C fibers b) Aα fibers c) Aβ fibers d) Aδ fibers
b) Aα fibers
32
32. Damage to the medial lemniscus can impair which sensation?
a) Crude touch b) Proprioception c) Pain d) Temperature
b) Proprioception
33
33. Which artery supplies the medial lemniscus?
a) Anterior spinal artery b) Vertebral artery c) Middle cerebral artery d) Posterior inferior cerebellar artery
a) Anterior spinal artery
34
34. The DCML pathway is involved in which type of sensation?
a) Fine touch b) Pain c) Temperature d) All of the above
a) Fine touch
35
35. The fasciculus cuneatus is involved in carrying signals from which body region?
a) Upper extremities b) Lower extremities c) Abdomen d) Face
a) Upper extremities
36
36. How many types of A-type nerve fibers exist?
a) 2 b) 3 c) 4 d) 5
c) 4
37
37. The medial lemniscus is formed after fibers cross at:
a) The medulla b) The spinal cord c) The thalamus d) The internal capsule
a) The medulla
38
38. Where do second-order neurons terminate in the DCML pathway?
a) Nucleus cuneatus b) Thalamus c) Postcentral gyrus d) Internal capsule
b) Thalamus
39
39. What type of receptor detects muscle stretch?
a) Golgi tendon organs b) Muscle spindles c) Merkel discs d) Ruffini corpuscles
b) Muscle spindles
40
40. Which nerve fibers carry temperature sensation?
a) Type Aβ b) Type C c) Type Aα d) Type Aδ
b) Type C
