Somatosensory and movement Flashcards
What are the three major families of somatosensory receptors?
Nocioception Hapsis Proprioception
nocioception
Pain and temperature receptors
Hapsis
Fine touch and pressure receptors
Proprioception
changes in body location and movement.
How does the somatosensory cortex contribute to the dorsal visual stream?
helps us specify which shape put our hand in to grab something
the somatosensory cortex contributes info to which visual stream, dorsal or ventral?
both!
How does the somatosensory cortex contribute to the ventral visual stream?
tells us about object size and shape, and to “complement visual information”
Does sensory information travel directly from sensory neurons to the brain?
No, the information passes through relays.
Geniculostriate Visual system
- Retnia 2. Lateral Geniculate Nucleus (part of thalamus) 3. Striate cortex (V1/Primary visual cortex)
Our skin is either ______ or ______
Hairy or glabrous
Glabrous skin
Very sensitive skin, found on the palms of hands, bottom of feet, lips, and tongue.
where are the somatosensory neuron somas located?
they make up the dorsal root ganglion in the spinal cord
what is the main neurotransmitter used in synaps to muscles?
acetylcholine
which corticospinal tract crosses over, Ventral or Lateral?
lateral crosses over
what is the path way for Haptic/proprioceptive axons into the somatosensory cortex
they take the dorsal spinothalamic tract. This projects up the spinal cord on the ipsilateral side to neurons in the dorsal column nuclei. These nuclei project through and across the medial lemniscus to the thalamus, then to the somatosensory cortex.
ipsilateral
occurring on the same side
What is the pathway for nociceptive axons into the somatosensory cortex?*
Nociceptive axons synapse onto neurons in the ipsilateral dorsal spinal cord. These neurons cross over and project to the brain as the ventral spinothalamic tract, which courses through the medial lemniscus to the thalamus and cortex.
what body parts have the most somatosensory neurons?
lips, tongue, hands
reflexes
movements without the brain
steps involved with voluntary movement
- Visually identify the object you want to grasp. 2. Plan and initiate movements in the frontal and motor cortices. 3. Spinal cord carries information from cortex to motor neurons in the spinal cord. 4. Spinal cord neuron axons carry information to muscles. 5. Sensory receptors provide feedback that the object has been grasped 6. Spinal cord carries information back up to the brain. 7. Basal ganglia and cerebellum refine. 8. Sensory cortex receives “grasped”.
What brain regions are involved in movement?
“1. Cortex 2. Brain stem 3. Spinal cord”
The _______ cortex produces motor sequences to achieve the goal set by the __________ cortex.
premotor prefrontal
What three parts of the cortex are involved with movement
Prefrontal cortex – goal selection Premotor cortex -‐ sequencing Motor cortex – execution
Where is the motor cortex located?
anterior of the central sulcus
