Summary
Samenvatting Neuroscience, ISBN: 9781605358413 Van Perceptie Tot Bewustzijn (5102PETB6Y)
- Course
- Institution
- Book
samenvatting (deel) h9 purves nodig voor tentamen perceptie en bewustzijn pb
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Summary Neurosciences (AB_1200)
-
Summary of Purves Chapter 22: Early Brain Development
-
Samenvatting Fundamentals of Neuroscience, UvA
Seller
Follow
drewesnoor
Content preview
PURVES NEUROSCIENCE CHAPTER 9: THE SOMATOSENSORY SYSTEMGlabrous (hairless) regions of the skin surface are specialized to generate a high-definition neural
image of manipulated objects.
Haptics = active touching. Involves the interpretation of complex spatiotemporal patterns of stimuli
that are likely to activate many classes of mechanoreceptors.
Stereognosis = identifying an object by manipulating it with the hand.
There are four mechanoreceptive afferents:
1. MERKEL
2. MEISSNER
3. PACINIAN
4. RUFFINI
Merkel cell afferents:
- Slowly adapting fibers
- Small receptive field
- 25% of mechanosensory afferents in the hand
- Only afferents to sample information from receptor cells in the epidermis
- Lie at the tip op epidermal sweat ridges
- Express Piezo2 as a result Merkel cells and their afferent axons can sense mechanical
stimuli
- Release neuropeptides on the neurites
- Have the highest spatial resolution of the sensory afferents
- Highly sensitive to points, edges, and curvature processing information about shape and
texture.
Meissner afferents:
- Express Piezo2
- Rapidly adapting fibers
- Small receptive field
- 40% of the mechanosensory innervation of the hand
- Lie in the tips of the dermal papillae adjacent to the primary ridges and closest to the skin
surface
- More than four times as sensitive to skin deformation as Merkel afferents.
- Less special resolution than Merkel cells
- Motion detection grip control.
Pacinian afferents:
- Rapidly adapting fibers
- Large receptive field
- 10-15% of mechanosensory innervation in the hand
- Located deep in the dermis or subcutaneous tissue
- Perceptions of distant events through transmitted vibrations tool use.
Ruffini afferents:
- Slowly adapting fibers
- Large receptive field
- 20% of mechanoreceptors in the hand
- Sensitive to skin stretch.
The cell bodies of afferent fibers reside in a series of ganglia that lie alongside the spinal cord and the
brainstem and are considered part of the PNS.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller drewesnoor. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.23. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
57727 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now