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Questions and Answers
Which type of information is conveyed by the anterior spinothalamic tract?
Which type of information is conveyed by the anterior spinothalamic tract?
- Crude touch and pressure
- Proprioceptive information from muscles
- Extremely painful sensations
- Light touch and pressure (correct)
Which tracts are responsible for conveying proprioceptive information from muscles and joints?
Which tracts are responsible for conveying proprioceptive information from muscles and joints?
- Gracile and cuneate tracts (correct)
- Anterior and posterior spinothalamic tracts
- Lateral spinothalamic tract and anterior spinocerebellar tract
- Medial lemniscus and posterior spinocerebellar tract
What is the function of the lateral spinothalamic tract?
What is the function of the lateral spinothalamic tract?
- Conveying painful and thermal sensations (correct)
- Conveying proprioceptive information from muscles and joints
- Conveying unconscious information to the cerebellum
- Conveying light touch and pressure sensations
Where do unconscious proprioceptive information from muscles, joints, and skin reach?
Where do unconscious proprioceptive information from muscles, joints, and skin reach?
Which tract is responsible for conveying discriminative touch sensations?
Which tract is responsible for conveying discriminative touch sensations?
What is the function of the spinocerebellar tracts?
What is the function of the spinocerebellar tracts?
Where do second-order neurons of the lateral spinothalamic tract reside?
Where do second-order neurons of the lateral spinothalamic tract reside?
Which type of sensation is primarily transmitted through the anterior spinothalamic tract?
Which type of sensation is primarily transmitted through the anterior spinothalamic tract?
What is the function of the anterior and posterior spinocerebellar tracts?
What is the function of the anterior and posterior spinocerebellar tracts?
Which tracts are responsible for transmitting discriminative touch, vibratory sense, and conscious muscle joint sense?
Which tracts are responsible for transmitting discriminative touch, vibratory sense, and conscious muscle joint sense?
Which tract is formed by the ascending fibers of the anterior spinothalamic tract, lateral spinothalamic tract, and spinotectal tract?
Which tract is formed by the ascending fibers of the anterior spinothalamic tract, lateral spinothalamic tract, and spinotectal tract?
Which nucleus is the third-order neuron for the anterior spinothalamic tract and gracilis and cuneate tracts?
Which nucleus is the third-order neuron for the anterior spinothalamic tract and gracilis and cuneate tracts?
Which tract is present throughout the length of the spinal cord?
Which tract is present throughout the length of the spinal cord?
Which tract is responsible for transmitting pain and temperature sensations?
Which tract is responsible for transmitting pain and temperature sensations?
What is the final destination of the axons of the third-order neurons of the anterior spinothalamic tract and gracilis and cuneate tracts?
What is the final destination of the axons of the third-order neurons of the anterior spinothalamic tract and gracilis and cuneate tracts?
What is the term for the compact bundle of fibers that forms from the ascending fibers of the gracilis and cuneate tracts?
What is the term for the compact bundle of fibers that forms from the ascending fibers of the gracilis and cuneate tracts?
Which tract conveys muscle joint information from the muscle spindles, tendon organs, and joint receptors of the trunk and the upper and lower limbs?
Which tract conveys muscle joint information from the muscle spindles, tendon organs, and joint receptors of the trunk and the upper and lower limbs?
What is the function of the Spinotectal Tract?
What is the function of the Spinotectal Tract?
Which tract is responsible for movements of the eyes and head toward the source of stimulation?
Which tract is responsible for movements of the eyes and head toward the source of stimulation?
What is the function of the Spinoreticular Tract?
What is the function of the Spinoreticular Tract?
Where do the Corticospinal Tracts originate from?
Where do the Corticospinal Tracts originate from?
What is the pathway of the Corticospinal Tracts?
What is the pathway of the Corticospinal Tracts?
What is the characteristic of the Corticospinal Tracts in the medulla oblongata?
What is the characteristic of the Corticospinal Tracts in the medulla oblongata?
Which tract is not a part of the Descending tracts?
Which tract is not a part of the Descending tracts?
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Study Notes
Spinocerebellar Tracts
- Anterior Spinocerebellar Tract conveys muscle joint information from muscle spindles, tendon organs, and joint receptors of the trunk and upper and lower limbs.
- Posterior Spinocerebellar Tract receives muscle joint information from muscle spindles, tendon organs, and joint receptors of the trunk and lower limbs.
Other Tracts
- Spino-olivary Tract conveys information to the cerebellum from cutaneous and proprioceptive organs.
- Spinotectal Tract terminates in the superior colliculus of the midbrain, responsible for movements of the eyes and head toward the source of stimulation.
- Spinoreticular Tract terminates in the reticular formation, influencing levels of consciousness.
Descending Tracts
- Divided into Pyramidal tracts (corticospinal and corticobulbar) and Extrapyramidal tracts (reticulospinal, tectospinal, rubrospinal, vestibulospinal, and olivospinal).
- Corticospinal Tracts originate from the primary motor cortex and secondary motor cortex, passing through the posterior limb of the internal capsule.
Anterior Spinothalamic Tract
- Conveys light touch and pressure pathways from the posterior root ganglion of the spinal nerve.
- Second-order neurons are cells of the substantia gelatinosa.
- Third-order neurons are cells of the ventral posterolateral nucleus of the thalamus, terminating in the postcentral gyrus of the cerebral cortex.
Gracilis and Cuneate Tracts
- Convey discriminative touch, vibratory sense, and conscious muscle joint sense pathways.
- First-order neurons are the posterior root ganglion of the spinal nerve.
- Second-order neurons are in the nuclei gracilis and cuneatus of the medulla oblongata.
- Third-order neurons are in the ventral posterolateral nucleus of the thalamus, terminating in the postcentral gyrus of the cerebral cortex.
White Matter
- Divided into anterior, lateral, and posterior white columns or funiculi.
Ascending Tracts
- Conduct afferent information, divided into exteroceptive information (pain, temperature, touch) and proprioceptive information (muscles and joints).
- Lateral Spinothalamic Tract conducts pain and temperature pathways.
- Anterior Spinothalamic Tract conducts light touch and pressure pathways.
- Gracile and Cuneate Tracts conduct discriminative touch, vibratory sense, and conscious muscle joint sense pathways.
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