16 Questions
Where do the 3rd order of senses that come from the body and head/neck synapse in the thalamus?
Medial ventral nucleus
Which pathway carries hearing and balance sensations?
Lateral lemniscus
In which part of the brainstem are the motor nuclei that control cranial nerves located?
Pons
Where does unconscious proprioception from the lower limb decussate?
Spinal cord
Which tract carries pain and sensation with a three-order neuron system?
Lateral spinothalamic tract
Where is the first order neuron located for the pathway that carries light touch sensations?
Dorsal root ganglion
Which part of the brain is associated with conscious proprioception of the upper thorax and upper limb?
Parietal lobe
What strange phenomenon occurs in the pons related to decussation of sensory information?
Decussation to its own side of the cerebellum
Where is the second-order neuron located for the pathway that carries light touch sensations?
Thalamus
What type of information does the lateral ventral nucleus of the thalamus process?
Pain and sensation from the body
Where does the motor pathway for light touch sensations descend to?
Cerebellum
In which structure do the first-order neurons for proprioception of the upper thorax and upper limb synapse?
Thalamus
What is the main function of the lateral spinothalamic tract?
Carrying pain and sensation
Where does unconscious proprioception from the lower limb decussate?
Spinal cord
What important sensory information does the medial ventral nucleus of the thalamus process?
Unconscious proprioception of upper thorax
Where is the first-order neuron located for the pathway that carries unconscious proprioception of lower limb?
Dorsal root ganglion
Study Notes
Thalamus
- Lateral ventral nucleus of thalamus receives 3rd order sensory information from body, head, and neck
- Medial ventral nucleus receives 2nd order sensory information
Sensory Pathways
- Fasciculus cuneatus carries conscious proprioception and touch/vibration sensations from upper thorax and upper limb
- Lateral lemniscus carries hearing and balance sensations, with a focus on hearing
- Lateral spinothalamic tract carries pain and sensation with 3rd order neurons, and 1st order neurons located in dorsal root ganglion
Thalamus and Parietal Lobe
- Sensory information that reaches the thalamus mostly goes to the parietal lobe
Unconscious Proprioception
- Unconscious proprioception in lower limb does not decussate, instead decussating in the spinal cord
- The pons makes another decussation, directing it to the same side of the cerebellum
Cuneus Cerebellar Pathway
- The pathway may be important for carrying unconscious proprioception of lower limb
Brainstem and Motor Control
- Brainstem controls cranial nerves and motor nuclei
Internal Capsule
- Posterior side of internal capsule is involved in pathways carrying light touch sensations
Test your knowledge on the thalamus and sensory pathways. Learn about the lateral and medial ventral nuclei of the thalamus, the pathways for senses from the body, head, neck, upper thorax, upper limb, touch, vibration, and proprioception.
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