Somatosensory System Flashcards
Dr. Alder
For the DCMLS, the Gracile tract starts off medial and the Cuneate tract starts off lateral. At the medulla the tract resembles a “____ ____” whereby the _____ limb is posterior and the _____ limb is anterior.
- Standing Man
- Upper
- Lower
The posterior parietal cortex connects to the _____ cortex for association and is involved in Attention
Motor
The first relay of the STT is at the Spinal dorsal horn, the second relay is at the ____ ____ ____
Ventral Posterolateral Nucleus (VPL)
For DCMLS, the Spinal Cord Somatotropy is that Distal body (legs, lower trunk) is found more ______,
Medial
While Ia and II receptors are for proprioception, AB are for touch, The receptor type responsible for Pain, temperature, and itche are _____ _____ ____. One example is called the _____ receptors, which are mildly myelinated, another example is called the _____ receptors, which have no myelination.
- Free nerve endings
- AD
- C
For DCMLS, the lower-body tract begins in mechano-receptors that enter the lumbar spinal cord, then Cervical Spinal cord, and reaches its first relay at the _____ ____, where the _____ nucleus synapses within the Internal Arcuate Fibers
- Caudal Medulla
- Gracile
Spinocerebellar tract is contra or Ipsi-lateral?
Ipsilateral
The CST is responsible for the ____ modality and Decuassates at _____
- Motor
- Pyramids (Spino-medullary Junction)
For the DCMLS, the Gracile tract starts off medial and the Cuneate tract starts off lateral. From Middle pons to Posterior Thalamus, the Lower limb is found _____. However, before reaching the cortex it completes one final flip and lower limb fibers end up being positoned ______
- Lateral
- Medial
The STT decussates that the _____ ____ (____ ___)
- Anterior Commissure
- (Spinal Cord)
The DCMLS transmits _____ information, specifically ______, ______, and _____, and decussates at the Internal Arcuate Fibers (lower medulla)
- Sensory
- Vibration
- Joint position
- Fine Touch
For DCMLS, the Spinal Cord Somatotropy is that Proximal body (Occiput, neck) is found more ______,
Lateral
The DCMLS decussates at _____ ____ ___
Internal Arcuate Fibers (Lower medulla)
The ____ ______ are receptors found just below hairless skin, which makes sense because they detect light touch, surfaces, and motion
Meissner Corpuscles
The DCMLS terminates in the ______ _____
Post-central Gyrus (Primary Somatosensory Cortex)
Unlike the DCMLS, the STT synapses and decussates at the ______ ____ of the spinal cord
Ventral horn of Gray Matter
In terms of directionality, The Corticospinal Tract is _____, while the Dorsal Column-Medial Lemniscus System and Spinothalamic Tract are both ____.
- Descending
- Ascending
Secondary somatosensory Cortex (SII) connects to the _____ system for tactile learning and memory
Limbic
The somatotopic organization of STT in spinal cord has the legs being more _____
Lateral
For DCMLS, The second relay occurs that the _____ ____ _____ _____ of the _____
- Ventral Posterior Lateral Nuclues
- Thalamus
Lissauer’s tract
The upward ascending of about 2 levels in the STT,
The _____ _____ are receptors found at the tips of epidermal ridges, which makes sense because they detect Edges and Indentations
Merkel-Cells
The Spinothalamic Tract (STT) senses _____, ____, and _____ _____. It decussates at the Anterior Commisures (Spinal Cord)
- Pain
- Temperature
- Crude touch
For DCMLS, after the Caudal medulla, the pathway continues through the Rostral medulla, passing within the ______ _____ to enter the Mid-pons and Midbrain.
Medial Lemniscus
