Podcast
Questions and Answers
Which part of the spinal cord is responsible for anchoring it to the vertebrae?
Which part of the spinal cord is responsible for anchoring it to the vertebrae?
What type of fibers are found in spinal nerves?
What type of fibers are found in spinal nerves?
What is the purpose of Weigert-Pal staining in human spinal cord sections?
What is the purpose of Weigert-Pal staining in human spinal cord sections?
What is the name of the reflex illustrated in the diagram?
What is the name of the reflex illustrated in the diagram?
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Which of the following is NOT a type of ascending pathway?
Which of the following is NOT a type of ascending pathway?
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What is the main function of the dorsal root ganglion?
What is the main function of the dorsal root ganglion?
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Which structure is NOT part of the spinal nerve?
Which structure is NOT part of the spinal nerve?
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What is the purpose of the grey and white ramus communicans?
What is the purpose of the grey and white ramus communicans?
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What is the main function of the ascending pathways in the spinal cord?
What is the main function of the ascending pathways in the spinal cord?
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What is the purpose of the ventral root?
What is the purpose of the ventral root?
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Where do sensory neurons synapse onto second-order neurons in the pathway for pain and temperature?
Where do sensory neurons synapse onto second-order neurons in the pathway for pain and temperature?
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What is the function of the dorsal root ganglion in the ascending pathway?
What is the function of the dorsal root ganglion in the ascending pathway?
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At what level do the second-order neurons in the spinothalamic tract decussate?
At what level do the second-order neurons in the spinothalamic tract decussate?
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What is the destination of the spinothalamic tract in the brain?
What is the destination of the spinothalamic tract in the brain?
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What type of information is transmitted through the spinothalamic tract?
What type of information is transmitted through the spinothalamic tract?
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What is the function of the thalamus in the ascending pathway?
What is the function of the thalamus in the ascending pathway?
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Where does the spinothalamic tract originate?
Where does the spinothalamic tract originate?
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What is the function of the brain stem in the ascending pathway?
What is the function of the brain stem in the ascending pathway?
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What is the role of the midbrain in the ascending pathway?
What is the role of the midbrain in the ascending pathway?
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Which pathway is responsible for transmitting information related to fine touch, two-point discrimination, vibration, and conscious proprioception?
Which pathway is responsible for transmitting information related to fine touch, two-point discrimination, vibration, and conscious proprioception?
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Which of the following is NOT a part of the ascending pathway?
Which of the following is NOT a part of the ascending pathway?
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Where do the sensory neurons synapse onto second-order neurons in the dorsal column pathways?
Where do the sensory neurons synapse onto second-order neurons in the dorsal column pathways?
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What is the function of the gracile tracts in the dorsal column pathways?
What is the function of the gracile tracts in the dorsal column pathways?
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Which of the following is NOT a cause of cerebellar dysfunction?
Which of the following is NOT a cause of cerebellar dysfunction?
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What is the function of the spinocerebellar tracts?
What is the function of the spinocerebellar tracts?
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Which structure is the final destination of the dorsal column-medial lemniscus pathways?
Which structure is the final destination of the dorsal column-medial lemniscus pathways?
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What is the function of the cerebellum as a comparator?
What is the function of the cerebellum as a comparator?
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Which of the following is NOT a component of the dorsal column-medial lemniscus pathways?
Which of the following is NOT a component of the dorsal column-medial lemniscus pathways?
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What is the function of the medulla oblongata in the dorsal column-medial lemniscus pathways?
What is the function of the medulla oblongata in the dorsal column-medial lemniscus pathways?
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Which pathway is responsible for transmitting information related to subconscious proprioception?
Which pathway is responsible for transmitting information related to subconscious proprioception?
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Which descending motor control pathway originates in the cortex?
Which descending motor control pathway originates in the cortex?
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What is the primary function of the corticospinal tract?
What is the primary function of the corticospinal tract?
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Which nuclei are involved in the vestibulospinal tract?
Which nuclei are involved in the vestibulospinal tract?
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What is the function of the reticulospinal tract?
What is the function of the reticulospinal tract?
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Which tract is involved in the coordination of head and eye movements?
Which tract is involved in the coordination of head and eye movements?
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What is the function of the rubrospinal tract?
What is the function of the rubrospinal tract?
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How many descending motor control pathways originate in the brain stem?
How many descending motor control pathways originate in the brain stem?
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What is the main difference in the decussation levels of different pathways in the spinal cord?
What is the main difference in the decussation levels of different pathways in the spinal cord?
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What is the name of the tract involved in the transmission of sensory information from the muscles to the cerebellum?
What is the name of the tract involved in the transmission of sensory information from the muscles to the cerebellum?
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Which of the following texts is NOT recommended for further reading on the topic of neuroscience?
Which of the following texts is NOT recommended for further reading on the topic of neuroscience?
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What is the level of the spinal cord where the dorsal column pathways, spinothalamic tract, and corticospinal tract can be compared?
What is the level of the spinal cord where the dorsal column pathways, spinothalamic tract, and corticospinal tract can be compared?
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Who is the author of the lecture slides on major ascending and descending pathways?
Who is the author of the lecture slides on major ascending and descending pathways?
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What is the edition of the recommended text 'Barr’s the Human Nervous System: An Anatomical Viewpoint'?
What is the edition of the recommended text 'Barr’s the Human Nervous System: An Anatomical Viewpoint'?
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What is the year of publication of the recommended text 'Neuroscience: Exploring the Brain'?
What is the year of publication of the recommended text 'Neuroscience: Exploring the Brain'?
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Study Notes
Spinal Cord Structure
- Cauda equina (horse's tail) is a part of the spinal cord
- Filum terminale anchors the spinal cord to the vertebrae
- Spinal nerves are 'mixed' - they contain sensory and motor fibers
Organization of the CNS
- The CNS consists of the cerebral cortex, forebrain, thalamus, midbrain, pons, medulla oblongata, dorsal root ganglion, spinal cord, and spinal nerves
- The spinal cord receives and integrates information from sensory neurons and sends motor output to muscles and glands
Ascending Pathways
- General somatic afferents (GSAs) and general visceral afferents (GVAs) transmit information from sensory neurons to the spinal cord and brain
- Conscious sensations: pain, temperature, crude and fine touch, conscious proprioception
- Special senses: cranial nerves
Specific Ascending Pathways
- Pain/temperature: spinothalamic tract
- Fine touch/two-point discrimination/vibration/conscious proprioception: dorsal column-medial lemniscus pathways
- Subconscious proprioception: spinocerebellar tracts
Descending Motor Control Pathways
- Voluntary control of skilled movements: corticospinal tract
- Posture and locomotion: reticulospinal tract
- Balance, posture, 'antigravity': vestibulospinal tract
- Facilitation of flexion: rubrospinal tract
- Coordination of head and eye movements: tectospinal tract
Decussation of Descending Pathways
- Different pathways decussate at different levels (dorsal column pathways, spinothalamic tract, corticospinal tract)
Motor Output
- Integration of general and special sensation and motor output
- Multiple descending systems control motor output, with the corticospinal tract originating in the cortex and other tracts originating in the brain stem
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Description
This quiz covers the major ascending and descending pathways in neuroanatomy, including spinal nerves and their components. Learn about the cauda equina, filum terminale, and more.