Summary
Summary Nervous System Study Unit 2
- Course
- Institution
- Book
FLG 332 Summaries for Study Unit 2 (Semester Test 1). Nervous System (Third Year). Most important notes for the study unit.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Test Bank - Human Physiology: An Integrated Approach (8th Edition 2024) Dee Unglaub Silverthorn | All Chapters Included | Updated
-
Body Temperature Study Unit 1
-
Haematology & Immunology Study Unit 4
Seller
Follow
micaeladj10
Content preview
FLG 332 Copyright Micaela de JagerUnit 2 – Nervous System
LECTURE 1 – MOTOR SYSTEM
NERVOUS SYSTEM
MICAELA DE JAGER 18
,FLG 332 Copyright Micaela de Jager
SOMATIC MOTOR DIVISION
MOTOR CORTICAL HOMUNCULUS
MICAELA DE JAGER 19
,FLG 332 Copyright Micaela de Jager
MOTOR SYSTEM
≫ Single efferent neuron
≫ Leaves CNS via ventral horn towards target tissue
≫ Synapse of somatic motor neuron on muscle fibre = NEUROMUSCULAR JUNCTION
≫ Somatic efferent neuron vesicles release acetylcholine (Ach)
≫ Ach taken up by nicotinic Ach receptors
≫ Acetylcholine esterase inactivates Ach (by degrading it)
≫ The esterase is in high concentration at cholinergic nerve ending
≫ Inhibits contraction of skeletal muscles
MICAELA DE JAGER 20
, FLG 332 Copyright Micaela de Jager
UPPER & LOWER MOTOR NEURONS
UMN neurons in the higher centers of brain
control LMN
3 types:
1. Motor neurons in cerebral cortex
2. Neurons in basal ganglia and brainstem nuclei
3. Neurons in cerebellum
LMN anterior gray horn cells in the spinal cord and the
motor neurons of the cranial nuclei in brainstem
innervates muscles directly
DIRECT PYRAMIDAL/CORTICOSPINAL PATHWAY
Voluntary movement
From cerebral cortex descend to thalamus brain stem spinal cord
• Fibers that end in the brain stem (corticobulbar tracts)
- Innervates muscles of head (larynx, tongue, eye movement )
3 Descending tracts:
MICAELA DE JAGER 21
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 micaeladj10. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.11. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82956 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now