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Posterior White Column-Medial Lemniscal Pathway Quiz

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What is the main modality transmitted by the posterior white column-medial lemniscal pathway?

Discriminative touch, vibration, and conscious proprioception

Which of the following receptors does the posterior white column-medial lemniscal pathway NOT transmit information from?

Free nerve endings

Which of the following Brodmann areas in the primary somatosensory cortex (S1) receives input mainly from muscle spindle afferents?

Area 3a

Which of the following tracts within the posterior columns transmits information from areas inferior to T6?

<p>Fasciculus gracilis</p> Signup and view all the answers

Where do the third-order neurons of the posterior white column-medial lemniscal pathway terminate?

<p>Primary somatosensory cortex (S1)</p> Signup and view all the answers

Which Brodmann area in the primary somatosensory cortex (S1) receives input mainly from Golgi tendon organs and joint afferents?

<p>Area 2</p> Signup and view all the answers

Where do the axons of 2nd order neurons cross to the opposite side?

<p>Anterior gray and white commissures</p> Signup and view all the answers

Which laminae relay information related to pain, temperature, and touch in the spinal cord?

<p>Lamina 3 and 4</p> Signup and view all the answers

Where does the lateral spinothalamic tract terminate in the brain?

<p>Primary Somesthetic Area (S I)</p> Signup and view all the answers

Which nucleus in the spinal cord contains preganglionic fibers of sympathetic nerves?

<p>Intermedio-lateral nucleus</p> Signup and view all the answers

Which nucleus serves as a relay center for unconscious proprioception?

<p>Dorsal nucleus of Clark’s</p> Signup and view all the answers

Which part of the spinal cord transmits pain, temperature, and touch to the brain?

<p>Substantia gelatinosa</p> Signup and view all the answers

Which tract is responsible for transmitting crude touch and pressure sensations?

<p>Anterior spinothalamic tract</p> Signup and view all the answers

Which region of the brain is involved in interpreting the emotional aspect of pain?

<p>Cingulate gyrus</p> Signup and view all the answers

Which tract carries proprioceptive input from muscle spindles, Golgi tendon organs, and joint capsules?

<p>Anterior spinocerebellar tract</p> Signup and view all the answers

Which tract is involved in providing afferent information for spinovisual reflexes?

<p>Spinotectal tract</p> Signup and view all the answers

Which region of the brain is concerned with interpreting pain stimuli from internal organs and bringing about an autonomic response?

<p>Insular gyrus</p> Signup and view all the answers

Which of the following tracts ascends in the posterior white column before synapsing with the nucleus dorsalis at around the L3 or L4 spinal segment?

<p>Posterior spinocerebellar tract</p> Signup and view all the answers

Which of the following is the primary modality transmitted by the posterior white column-medial lemniscal pathway?

<p>Discriminative touch, vibration, and conscious proprioception</p> Signup and view all the answers

Which tract within the posterior columns transmits information from areas inferior to T6?

<p>Fasciculus gracilis</p> Signup and view all the answers

Which Brodmann area in the primary somatosensory cortex (S1) receives input mainly from muscle spindle afferents?

<p>Area 3a</p> Signup and view all the answers

Where do the axons of the second-order neurons in the posterior white column-medial lemniscal pathway cross to the opposite side?

<p>At the level of the medulla oblongata</p> Signup and view all the answers

Which nucleus in the spinal cord serves as a relay center for unconscious proprioception?

<p>Nucleus dorsalis</p> Signup and view all the answers

Which Brodmann area in the primary somatosensory cortex (S1) receives input mainly from Golgi tendon organs and joint afferents?

<p>Area 2</p> Signup and view all the answers

Which tract is responsible for transmitting fine-touch, vibration, pressure, and proprioception sensations from the right side of the body?

<p>Fasciculus cuneatus</p> Signup and view all the answers

Which region of the brain is involved in interpreting the emotional aspect of pain?

<p>Limbic system</p> Signup and view all the answers

Where do the third-order neurons of the posterior white column-medial lemniscal pathway terminate?

<p>Primary somatosensory cortex (S1)</p> Signup and view all the answers

Which laminae in the spinal cord relay information related to pain, temperature, and crude touch?

<p>Laminae I and II</p> Signup and view all the answers

Which tract is responsible for transmitting information about crude touch and pressure sensations?

<p>Anterior spinothalamic tract</p> Signup and view all the answers

Which region of the brain is involved in interpreting the emotional aspect of pain?

<p>Cingulate gyrus</p> Signup and view all the answers

Which tract carries proprioceptive input from muscle spindles, Golgi tendon organs, and joint capsules?

<p>Posterior spinocerebellar tract</p> Signup and view all the answers

Where do the third-order neurons of the posterior white column-medial lemniscal pathway terminate?

<p>Thalamus (VPL)</p> Signup and view all the answers

Which tract carries information about pain, temperature, and touch to the brain?

<p>Lateral spinothalamic tract</p> Signup and view all the answers

Which region of the brain is concerned with interpreting pain stimuli from internal organs and bringing about an autonomic response?

<p>Insular gyrus</p> Signup and view all the answers

Which tract is involved in providing afferent information for spinovisual reflexes?

<p>Spinotectal tract</p> Signup and view all the answers

Which laminae in the spinal cord relay information related to pain, temperature, and touch?

<p>Lamina 1 and 2</p> Signup and view all the answers

Which tract ascends in the posterior white column before synapsing with the nucleus dorsalis at around the L3 or L4 spinal segment?

<p>Posterior spinocerebellar tract</p> Signup and view all the answers

Which of the following receptors does the posterior white column-medial lemniscal pathway NOT transmit information from?

<p>Free nerve endings</p> Signup and view all the answers

Where do the axons of 2nd order neurons cross to the opposite side?

<p>Anterior gray commissure</p> Signup and view all the answers

Which laminae in the spinal cord relay information related to pain and temperature?

<p>Lamina 3 and 4</p> Signup and view all the answers

Where does the lateral spinothalamic tract terminate?

<p>Primary Somesthetic Area (S I)</p> Signup and view all the answers

Which nucleus in the spinal cord contains preganglionic fibers of sympathetic nerves?

<p>Dorsal nucleus of Clark’s</p> Signup and view all the answers

Which region of the brain receives input from the lateral spinothalamic tract?

<p>Parietal lobe</p> Signup and view all the answers

What do laminae 1 and 5 of the spinal cord transmit?

<p>Pain, temperature, and touch</p> Signup and view all the answers

Which part of the spinal cord is specific to receiving proprioception?

<p>Lamina 6</p> Signup and view all the answers

Where are the receptors for pain and temperature located?

<p>Free nerve endings</p> Signup and view all the answers

Which tract ascends in the contralateral white column as the lateral spinothalamic tract?

<p>Posterior white column-medial lemniscal tract</p> Signup and view all the answers

What is the main function of Lamina 2 in the spinal cord?

<p>Pain modulation</p> Signup and view all the answers

Study Notes

Posterior White Column-Medial Lemniscal Pathway

  • Modality: Discriminative Touch Sensation (includes Vibration) and Conscious Proprioception
  • Receptors: Most receptors except free nerve endings
  • 1st Neuron: Dorsal Root Ganglion
  • 2nd Neuron: Dorsal Column Nuclei (Nucleus Gracilis and Cuneatus)
  • 3rd Neuron: Thalamus (VPL)
  • Termination: Primary Somesthetic Area (S I)

Pathway Components

  • Posterior Column tract consists of:
    • Fasciculus gracilis (transmits information from areas inferior to T6)
    • Fasciculus cuneatus (transmits information from areas superior to T6)
  • Medial lemniscus
  • Medulla oblongata

Primary Somatosensory (SI) Cortex

  • Axons from third-order thalamic neurons terminate in the primary somatosensory (SI) cortex
  • Subdivided into four distinct areas:
    • Brodmann areas 3a, 3b, 1, and 2
    • Area 3a: muscle spindle afferents (mainly)
    • Area 2: Golgi tendon organs, and joint afferents (mainly)
    • Areas 3b and 1: receive cutaneous afferents from receptors such as Meissner corpuscles and Merkel cells

Lateral Spinothalamic Tract

  • Modality: pain and temperature
  • Receptors: free nerve endings
  • 1st Neuron: Dorsal root ganglia
  • 2nd Neuron: the posterior gray nuclei in column (substantia gelatinosa)
  • 3rd Neuron: Thalamus (VPL)
  • Termination: Primary Somesthetic Area (S I) and Widespread Cortical Region

Other Terminations of the Lateral Spinothalamic Tract

  • Reticular formation: (majority of the slow pain fibers) individual becomes aware of the pain
  • Cingulate gyrus: interpretation of the emotional aspect of pain
  • Insular gyrus: concerned with the interpretation of pain stimuli from the internal organs of the body and brings about an autonomic response

Anterior Spinothalamic Tract

  • Modality: crude touch and pressure
  • Receptors: free nerve endings
  • 1st Neuron: Dorsal root ganglia
  • 2nd Neuron: the posterior gray column (nucleus proprius)
  • 3rd Neuron: Thalamus (VPL)
  • Termination: Primary Somesthetic Area (S I)

Spinocerebellar Tracts

  • Posterior spinocerebellar tract: muscle and joint sensation
  • 1st order neuron axons terminate at the base of post gray column (nucleus dorsalis or Clarks nucleus)
  • 2nd order neurons ascend as the posterior spinocerebellar tract to medulla oblongata
  • Termination: cerebellar cortex (through inferior cerebellar peduncle)
  • Anterior spinocerebellar tract: muscle and joint sensation
  • 1st order neuron axons terminate at the base of post gray column (nucleus dorsalis)
  • 2nd order neurons ascend as the anterior spinocerebellar tract to medulla oblongata and pons
  • Termination: cerebellar cortex (through superior cerebellar peduncle)

Rexed Laminae

  • Lamina 1: relay information related to pain and temperature
  • Lamina 2: relay information related to pain and temperature (pain modulation)
  • Lamina 3 and 4: nucleus proprius; these laminae have many interneurons
  • Lamina 5: relay information related to pain and temperature
  • Lamina 6: presents only at the cervical and lumbar enlargements and receives proprioception
  • Lamina 7: Intermedio-lateral nucleus, contains preganglionic fibers of sympathetic (T1 -L2). Intermedio-medial nucleus, all over the spinal cord, receive visceral pain. Dorsal nucleus of Clark’s presents at (C8 – L2 or T1L4), relay center for unconscious proprioception

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