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| Question | Answer |
| Touch: 1st order is _________, it decussates at the ___________ neuron and end up in a ___________ 3rd order neuron. | 1st: ipsilateral 2nd: decussation 3rd: contralateral |
| Discriminative touch includes the following subcategories, with following receptors: | 1. Merkel's receptor 2. Meissner's corpuscle 3. Ruffini's corpuscle 4. Pacinian corpuscle |
| Which receptors are superficial? Are they sensitive to light energy? | Merkel's Meissner's Sensitive to light energy |
| Deep receptors include | Ruffini's corpuscle Pacinian corpuscle |
| Which receptors are fast adapting? | Meisner's corpuscle Pacinian's corpuscle |
| Which receptors are slow adapting? | Merkel's plate Ruffini's corpuscle |
| Make a table of the speed of adaptation, receptive field size, submodality, and functional application of the four main somatosensory receptors. | See slide 6. |
| Muscle spindles comprises ______, ______, and ________ axons. | 1. Ia afferent 2. II afferent 3. Gamma efferent |
| Ia afferent is (fast/slow) adapting while II afferent is (Fast/slow) adapting. | Ia: rapid adapting II: slow adapting |
| Muscle spindles sit (parallel/ perpendicular) to the muscle fibers. They are good at sensing _____. | Parallel. Sensing changes in muscle length. |
| Ib afferent axon is found in the ________. It senses changes in ________. | Golgi tendon organ. Senses changes in tendon tension |
| Priprioception fibers are _______ fibers. Touch receptors are ________ fibers. | Proprioceptors: Primary (Ia and Ib) and secondary (II) fibers. Touch receptors: Abeta fibers. |
| (proprioception/touch) axons are extremely rapidly conducting. | Proprioception |
| Touch neuron are less myelinated, but still _______. | Fast conducting |
| T/F: 1st degree neurons for touch and proprioception travel in the dorsal column in the CONTRALATERAL side of stimulus. | F. IPSILATERAL! |
| Cell body of 1st degree sensory neurons lie in the _________. | Dorsal root ganglion of spinal cord. |
| The 1st order sensory neurons synapse with the second order neurons in the ______ (UE) or _________(LE) in the medulla. | Cuneate nucleus (UE) Gracillis nucleus (LE) |
| The pathway in which 2nd order neuron travels is called the _________. It synapses with the 3rd order neuron in the _______. | Medial lemniscus. Synapses in the thalamus. |
| In the dorsal column of the spinal cord, the more distal the body region is, the more (lateral/medial) the 1st order axon travels. | Medial. |
| The touch and proprioception sensory system is also called the _______. | Dorsal column medial lemiscal system. |
| The fibers that cross the center of the body are called _________. | The arcuate fibers |
| Where in the thalamus does the DCML 2nd and 3rd order neurons synapse with each other? | Ventral Posterior Lateral nucleus of the thalamus (VPL) |
| After leaving the VPL, the 3rd order axon enters the _______ and travels along the _____ into its respective area in the __________. | internal capsule coronal radiata post-central gyrus (primary sensory cortex) |
| Which lamina does the 3rd order axon terminate? | lamina 4 |
| Order of BA from central sulcus to postcentral sulcus. | central sulcus BA3a BA3b BA1 BA2 Postcentral sulcus BA5 BA7 |
| All proprioceptive neuron are going to synapse in BA ( ) | BA 3a |
| All touch modality neurons are going to synapse in BA ( ) | BA 3b |
| BA 1 integrates ______ inputs to achieve ________. | Touch object texture analysis |
| BA 1 sends projection fibers to BA2, which integrates ________ information to differentiate ________. | Integrates proprioception and touch differentiate object shape, size, and orientation. |
| BA2 also sends output projections to BA5, which also gets commisural input from other fields, to integrate ______ activities. It also has body-body synthesis, which is referred to as _______ reference. | Bimanual activities. Egocentric |
| BA7 combines self image with visual inputs to give us ________, which is also called ______. | Body-space synthesis, which is also called exocentric reference. |
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