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20 Cards in this Set

  • Front
  • Back

Type of channel for mechanoreceptors?

Degenerin/Epithelial Na

Type of cation channel for photoreceptors

Cyclic nucleotide gated

Type of cation channel for olfactory receptors

Cyclic nucleotide gated

Type of cation channel for taste receptors

Cyclic nucleotide gated

Type of cation channel for pain receptors

Transient receptor potential

Type of cation channel for temperature receptors

Transient receptor potential

How is stimulus intensity coded?

Firing frequency of the afferent axon

Neurotransmitters used in sensory pathways

L-glutamate

Six common features of sensory systems

1. Stimulus coding


2. Receptive field properties


3. Topographic representation of receptive fields


4. Parallel channels for subcortical relay (thalamus)


5. Cortical control of sensory relay


6. Prallel pathways for sensory processing

Serial or hierarchical processing refers to what?

Propagation of sensory information from primary areas to higher-order association areas; it also may refer to information coming from assoication areas that modulate lower levels of information

Are sensory pathways inhibitory or excitatory?

Excitatory

What distinguishes the olfactory system from other sensory pathways in the way their pathways project?

Olfactory system does not project to modality-specific relay nuclei

What is the dorsal stream of the sensory system involved in? Where do they project?

Visuospatial processing, and contains neurons that respond to object location and movement, and project to the posterior parietal cortex

What is the ventral stream of the sensory system involved in? Where do they project?

Identification of objects, including such features as shape and colour (the "what" of the object). They project to the lateral temporal cortex, including the superior and lateral temporal gyrus and temporal pole

The dorsal column-medial lemniscal system receives input from where?

1. Low-threshold skin mechanoreceptors (tactile discrimination)


2. Muscle spindles in the fingers (stereognosis and fine motor control)


3. Proprioceptors ( muscle spindles and joint receptors)=




They regulate posture, gait, and reaching movements

Visual representation of parallel processing in dorsal and ventral streams of sensory information

Meissner corpuscles are stimulated by?

Dynamic skin deformation: touch; edge contours; Braille-type stimuli

Merkel disks are stimulated by?

Points, corners, edges: touch; perception of texture and form

Ruffini end-organs are stimulated by?

Static forces (skin stretch): Proprioception (hand and finger position)

Pacini corpuscles are stimulated by?

Mechanical and vibratory stimuli; vibration