Class Notes (837,443)
Canada (510,273)
Psychology (3,528)
PSY290H1 (34)
Lecture 7

Lecture 7 - Motor Control

7 Pages
Unlock Document

Franca Placenza

Movement 1. All movement involves contraction of muscles o Contractions of muscles are orchestrated by neural circuits in the spinal cord and brain 2. Neural circuits o Lower motor neuron circuits >>> control simple reflexive movements by spinal cord o Upper motor neurons circuits >> found in various parts of the brain that control voluntary movement and execution o EX = reaching for a glass 3. Cardiac muscle and smooth muscle (found in organs) are other types Anatomy of Muscles 4. Skeletal muscles = voluntary movement o Made up of hundreds of muscles fibers (essentially the cells of the muscle) Are multi-nucleid (more than one nucleus) o Main type of muscle 5. Each muscle enclosed in connective tissue o Forms tendons at ends that connects to bones 6. 2 main types of muscle fibers: o Extrafusal fibers = make up the bulk of the muscle o Intrafusal fibers = found within a specialized receptor called muscle spindle 7. Structure of Skeletal Muscle Fibers 8. Muscle fibers made up of organelles 9. Bundles of myofibril (protein molecules joined together) o Myofibril are divided into segments (sarcomere) Thin filaments > made up of actin Thick filaments > made up of myosin Muscle Contraction 10.Muscle contractions occur in response to firing of motoneuron 11.Firing of motor neuron releases acetylcholine (AcH) at neuromuscular junction o Neuromuscular junction where motor neuron synapse directly on the muscle fiber Highly specialized 1:1 relationship between firing and creation of action potential in the muscle fiber o Binds at nicotinic receptor on muscle fiber Depolarizes it and causes action potential 12.Action potential propagates (spreads) along muscle fibers
More Less

Related notes for PSY290H1

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.