Introduction & Touch Flashcards
Modalities of sensation
Touch, audition, vision, smell, and taste
Modalities of sensation are processed as ____ ____ (____ ____) in the nervous system.
Electrical signals (action potentials)
- Receptor cells of sensory organs are not always ____;
- May bypass ____ and/or the brain
- neurons
- thalamus
Ipsilateral projection vs. contralateral projection
Ipsilateral projections project signal to the same side of the brain. On the other hand, contralateral projection projects signals to the other side of the brain.
Somatosensory system relays ____ about the ____
- Body position =
- Itch =
- Pain =
Information; body
- proprioception
- pruriception
- nociception
Nerve endings gives the receptor neurons to differentiate the ____ of sensation.
Quality
Four major types of skin mechanoreceptors
- Merkel’s disks
- Meissner’s corpuscles
- Ruffini endings
- Pacinian corpuscles
Merkel’s disks are right under the ____ and are responsible for…
Epidermis; Light touch
Meissner’s corpuscles are right under the ____ and are responsible for…
Epidermis; Touch and slow vibrations
Ruffini endings are in the ____ and are responsible for…
Dermis; Stretch, pressure, and warmth
Pacinian corpuscles are in the ____ and are responsible for…
Dermis; Brief and rapid vibrations, deep pressure
Labeled line
Different receptors for different qualities and have different neural pathway to the brain
(But not all sensory systems)
Receptive field
The area in which a neuron cell can sense the stimuli
For receptive fields, convergence creates ____ receptive fields for ____ neurons, whereas ____ receptive fields are found in more ____ areas.
Large; secondary; small; sensitive
A large receptive field is created by sensory neurons ____ to a secondary neuron; A small receptive field is created by having ____ neurons to ____.
Converge; fewer; converge
