F10_L11_Brain_motor

F10_L11_Brain_motor - Psy 111 Basic concepts in...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Psy 111 Basic concepts in Biopsychology Lecture 11: Brain motor systems “Whoa! That was a good one! Try it, Hobbs— just poke his brain right where my finger is.”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Neural Innervation of Muscle Motor neuron pool = all the motor neurons (i.e. units) that innervate a single muscle
Background image of page 2
Crossed-Extensor Reflex Synergistic activation of muscles in one limb is coupled to opposing control of contralateral limb. e.g. flexsor reflex coupled to extension of contralateral limb. Spinal Circuits form motor commands for complex behavior
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Objectives Provide overview of cortex and motor function. Describe the descending motor pathways and their specific functions. Define the role of the primary motor cortex (M1) in activation of descending pathways and its relation to secondary and association motor cortices. Define the relation between M1 and motor units. Describe the encoding of motor commands in M1. Explain the connections of the basal ganglia and its relation between prefrontal cortex and motor cortices. Describe the role of the superior colliculus in motor action. Describe the role of the cerebellum in coordination of motor action.
Background image of page 4
Motor Action is Preceded by Planning Planning -serves to coordinate sensory input (perception) to organize motor output. -is the specialized function of the brain in producing behavior.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cortex and Brain Output: Overview Precentral Gyrus = primary motor cortex (M1); stimulate muscle contraction. Supplemental and Premotor cortices = secondary motor cortices (SMA & PMA); involved in coordination of input to M1. Prefrontal cortex involved in “executive function” ie conscious decisions Posterior Parietal cortex involved in perception of body & surroundings; input Basics Organization: Sensor/Perceptual Decision Command
Background image of page 6
“Cortical Sensorimotor System” Sensory info proceeds through primary sensory cortices to association cortex in posterior parietal area before being communicated to association cortex in frontal lobe (prefrontal cortex). M1
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cortical Sensorimotor System: Prefrontal Ctx Prefrontal cortex makes decision (“executive” function) with information from post parietal ctx sends commands to secondary motor cortex (via basal ganglia; subcortical cortex-cortex loop).
Background image of page 8
Secondary Motor Cortex Premotor and Supplementary motor areas receive input from basal ganglia and activate Primary motor cortex. Produces precise pattern activation of specific regions of M1. -once M1 is activated this will produce stimulation of alpha motor neurons.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Primary Motor Cortex Primary Motor mapping is distorted based on number of motor units. The more motor units allows higher motor acuity (i.e. dexterity). Each motor unit receives multiple overlapping
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/18/2010 for the course PSYCH 111 taught by Professor Kippen during the Fall '08 term at UCSB.

Page1 / 41

F10_L11_Brain_motor - Psy 111 Basic concepts in...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online