MechanoRs Flashcards Preview

Neuroanatomy > MechanoRs > Flashcards

Flashcards in MechanoRs Deck (9)
Loading flashcards...
1

Two Rs Near Epidermal Surface

Meissner's corpuscle and Merkel cells

2

Smallest Receptive Field

Merkel Cells, used to read braille

3

Two Rapidly Adapting and Two Slow Adapting (fire throughout) Rs

Meissner's and Pacinians vs. Merkel cells and Ruffini endings

4

2 Factors of Stimulus Intensity

AP freq and population of neurons firing

5

Sensitivity to Electrical Stimulation vs. Local Anesthetic Blocking

Proprio (largest), then touch, then As and C for pain vs. opposite for LA

6

Syphilis

Degeneration of primary sensory afferents, so different than lesion

7

Receptive Fields of Principal Cells in Dorsal Column Nucleus

Excited DRG neurons project to stimulate DCN Principal Cells, but DRG neurons just surrounding excite inhibitory interneurons in DCN that inhibit both excited DRG and P cell to sharpen receptive field and enhance 2 point descrimination. Descending inputs also activate these interneurons as additional checks

8

Cortical Somatic Sensory Area S1

Receive thalamic input from contra for proprio, fine grain discrim, texture, stereognosis

9

Cortical Somatic Sensory Area S2

Receive ipsi and contra modalities of S1 and movement