40 Questions
Which type of information is carried by the spinothalamic pathway?
Pain, temperature, and nondiscriminative touch
Which ascending pathway carries information on pain, temperature, and nondiscriminative touch?
Spinothalamic pathway
Which of the following is NOT a main ascending pathway for general sensation?
Corticospinal
Which of the following is NOT carried by the posterior column pathway?
Pain
Where do trigeminal nerve first order neuron cell bodies reside?
Trigeminal ganglion
Which of the following is not one of the three main ascending pathways?
Corticospinal
Where are the first order neuron cell bodies for the trigeminal nerve located?
Trigeminal ganglion
Which type of sensation is carried by the posterior column pathway?
Discriminative touch
Which pathway carries discriminative touch, conscious proprioception, vibration, and distension of rectum and bladder?
Posterior column pathway
Which nucleus serves proprioception?
Mesencephalic nucleus
Where are the first order neuron cell bodies for the trigeminal nerve located?
Trigeminal ganglion
Which ascending pathway carries information on pain, temperature, and nondiscriminative touch?
Spinothalamic
Which of the following is not one of the three types of fibers in the spinal cord?
Transverse
Where do the 2nd order neurons of the posterior spinocerebellar tract originate?
Nucleus Dorsalis
Which type of fibers are found in the spinal cord?
All of the above
Which descending fibers are responsible for voluntary movement?
Corticospinal fibers
Which pathways terminate ipsilaterally in the cerebellar cortex?
Spinocerebellar pathways
Which ascending pathway serves all modalities except the special senses?
Trigeminothalamic pathway
Which ascending pathway serves all modalities except the special senses?
Trigeminothalamic
Where are the first order neuron cell bodies for the trigeminal nerve located?
In the trigeminal ganglion
Where do the second order neurons that form the posterior spinocerebellar tract originate?
Nucleus Dorsalis (Clarkes column; lamina VII
What are the three types of fibers in the spinal cord?
Ascending, descending, and intersegmental
Which of the following nerves does not have its own ganglion for first order neuron cell bodies?
Hypoglossal
Where do the 2nd order neurons of the spinocerebellar pathways terminate?
Ipsilaterally in the cerebellar cortex
Which nucleus serves proprioception?
Mesencephalic nucleus
Which tract joins the cuneocerebellar tract at the level of midmedulla?
Posterior spinocerebellar tract
Which ascending pathway carries distension of rectum and bladder?
Posterior column
What type of stimuli do the spinocerebellar pathways convey?
Unconscious proprioceptive stimuli
Where do the second order neurons of the posterior spinocerebellar tract originate?
Nucleus Dorsalis
Where do the 2nd order neurons of the posterior spinocerebellar tract originate?
Nucleus Dorsalis
Which pathways terminate ipsilaterally in the cerebellar cortex?
Posterior spinocerebellar pathways
Which region of the cerebellum do the spinocerebellar pathways convey unconscious proprioceptive stimuli to?
Vermis
Which ascending pathway carries information on proprioception?
Posterior column
Where do the spinocerebellar pathways terminate?
Ipsilaterally in the cerebellar cortex
Which nucleus serves fine and crude touch?
Principal nucleus
Which pathways convey unconscious proprioceptive stimuli to the spino- and pontocerebellum?
Posterior spinocerebellar and cuneocerebellar tracts
Which ascending pathway carries information on pain, temperature, and nondiscriminative touch?
Spinothalamic pathway
What type of information is carried by the posterior column pathway?
Discriminative touch, conscious proprioception, vibration, and distension of rectum and bladder
Which descending pathway conveys unconscious proprioceptive stimuli to the spino- and pontocerebellum from muscles, joints and skin of the lower limbs & trunk, and upper limbs respectively?
Spinocerebellar pathway
Which nucleus serves fine and crude touch?
Principal nucleus
Study Notes
- Ascending pathways carry impulses from peripheral receptors to the brain for general sensation.
- There are three main ascending pathways: posterior column, spinothalamic, and trigeminothalamic.
- The transmission of general sensation involves a series of three neurons in synaptic contact.
- The PC, ST, and TT pathways are all somatotopic.
- The posterior column pathway carries discriminative touch, conscious proprioception, vibration, and distension of rectum and bladder.
- The spinothalamic pathway carries information on pain, temperature, and nondiscriminative touch.
- The trigeminothalamic pathway serves all modalities except the special senses.
- The mesencephalic nucleus serves proprioception, the principal nucleus serves fine and crude touch, and the spinal nucleus serves pain and temperature.
- The three types of fibers in the spinal cord are ascending, descending, and intersegmental.
- Tracts occupy distinct and consistent positions in the CNS.
- Trigeminal nerve first order neuron cell bodies are found in the trigeminal ganglion except for those serving proprioception that are located in the mesencephalic nucleus.
- Facial, glossopharyngeal & vagus nerves all have their own ganglia wherein their 1st order neuron cell bodies reside.
- The spinocerebellar pathways comprise a sequence of two neurons that terminate ipsilaterally in the cerebellar cortex.
- The 1st order neurons arise from muscle spindles and Golgi tendon organs, travel via Aα fibres (Type Ia & Ib) to branch off as collaterals inside the spinal cord, passing through laminae I-VI to synapse in VII with 2nd ONs.
- The 2nd order neurons that form the posterior spinocerebellar tract originate in Nucleus Dorsalis (Clarkes column; lamina VII) between levels T1 to L3.
- Below L3, 1st ONs neurons pass in the fasciculus gracilis up as far as L3 where they synapse with Nucleus Dorsalis.
- The 2nd ONs ascend ipsilaterally in the cord and enter the cerebellum through the inferior cerebellar peduncle.
- The cuneocerebellar tract joins it at the level of midmedulla.
- Both tracts convey unconscious proprioceptive stimuli to the spino- and pontocerebellum from muscles, joints and skin of the lower limbs & trunk, and upper limbs respectively.
- These 2nd order neurons send collaterals to the cerebellar nuclei before ending bilaterally in the vermis and adjacent regions of the anterior and posterior lobes.
Test your knowledge on the pathways that carry general sensation in the nervous system with this quiz. Learn about the three main ascending pathways and the different types of fibers in the spinal cord. Challenge yourself with questions on the transmission of general sensation and the functions of the PC, ST, and TT pathways. Explore the spinocerebellar pathways and the role of muscle spindles and Golgi tendon organs. With ten questions to answer, this quiz will help you understand the anatomy and physiology of general sensation
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