Sensory and Motor Losses in Disease Process

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Which type of touch is primarily detected by Meissner corpuscles?

Light touch (correct)

Position and movement

Discriminative touch

Vibration

Where do the 1st order neurons synapse in the lower medulla?

Nucleus gracilis

Nucleus cuneatus (correct)

Ventral posterior nucleus of thalamus

Dorsal cord

What is the consequence of damage to the dorsal columns?

Increased sensation of fine touch

Loss of proprioception above the level of lesion (correct)

Sensory ataxia

Contralateral symptoms

Which receptors are responsible for detecting tactile and vibration stimuli?

Pacinian corpuscle Signup and view all the answers

What is the function of the 2nd order neurons in the sensory pathway?

Ascend contralaterally to the thalamus Signup and view all the answers

What clinical syndrome is caused by a severe deficit in touch and proprioception due to destruction of dorsal root ganglion cells?

Tabes dorsalis Signup and view all the answers

Damage to the spinothalamic tract would MOST likely result in:

Bilateral loss of pain and temperature sensation Signup and view all the answers

Where do the 2nd order neurons decussate in the sensory pathways?

Anterior white commissure Signup and view all the answers

In Brown-Sequard Syndrome, what is the key sensory loss pattern?

Contralateral loss of touch, vibration, and proprioception Signup and view all the answers

Where do the 3rd order neurons in the sensory pathways travel after leaving the thalamus?

Cortex Signup and view all the answers

What is the consequence of syringomyelia on the sensory pathways?

Bilateral loss of pain and temperature sensation Signup and view all the answers

Which structure is primarily responsible for transmitting pain and temperature sensations from the spinal cord to the brain?

Ventral posterior lateral thalamic nucleus Signup and view all the answers

Where do we find loss of sensations for all somatosensory modalities at the level of the lesion?

On the ipsilateral side Signup and view all the answers

Which sensory modalities are lost on the contralateral side below the level of the lesion?

Pain and temperature Signup and view all the answers

Where are pain and temperature sensations lost starting about one or two segments below the lesion?

Contralateral side Signup and view all the answers

Which tract is responsible for carrying pain and temperature sensations?

Spinothalamic tract Signup and view all the answers

Where do we find loss of fine touch and conscious proprioception?

On the ipsilateral side at a level above the lesion Signup and view all the answers

Where should damage be located to result in loss of fine touch and conscious proprioception at T6 on the left hand side?

T6 on the right side Signup and view all the answers