Summary
Summary Descending Tracts
- Course
- Institution
extensive notes on descending tracts based on najeeb's neuroscience videos
[Show more]
Seller
Follow
janellescott
Content preview
Ascending TractsPart 1
Gray matter - collection of neuronal bodies
White matter - collection of myelinated axons
Different types of white matter
tracts - run up and down
association fibers - runs anterior to posterior
commissures - runs from left to right
What are tracts?
bundles of axons which have a common origin and termination
whcih are present in the CNS in cephalocaudal axis
(connects upper part to lower part)
Ascending tracts -
takes information
from the lower part
of the CNS to the
upper part
sensory system
Descending tracts -
takes information
from the upper part
of teh CNS to the
lower part
motor system
Ascending Tracts 1
, Association fibers - bundles of axons that connect the CNS
anteroposteriorly. eg. connects the frontal lobe to the
occipital lobe
Commissures - white matter connecting the right and left part
of the CNS
Corpus callosum - this is the
largest commissure and it
connects the right cerebral
hemisphere with the left
cerebral hemisphere
Receptors -biological transducers that convert stimulus energy
into electrochemical energy of action potential
eg. if you touch something with your hand, the touch
stimulus will be converted to action potentials which will
pass along the axons to the CNS
rods and cones - unique apparatus which can convert visible
light energy into action potential in the optic nerve. i.e.
photoreceptors
The motor nerve will go to the effector system. The effector
system can be either a muscle or a gland.
Ascending Tracts 2
, Organization of fibers in the spinal cord
The ventral and dorsal roots are pure. This means they are not
mixed. The dorsal roots has only sensory fibers and the
ventral roots has only motor fibers
The spinal nerve trunk, ventral ramus and dorsal ramus are all
mixed. This means that they have both sensory and motor fibers
In the spinal cord, there are 3 major white matter areas:
dorsal
column/dorsal
fasciculus
lateral column
anterior column
Ascending Tracts 3
, 🧠 tracts either run in the dorsal column, the lateral
column or the anterior column
dorsal column - only
ascending tracts
lateral column - both
ascending and descending
tracts
anterior column - both
ascending and descending
tracts
The tracts in the dorsal column are heavily myelinated
Ascending Tracts 4
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 janellescott. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79976 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now