Lecture 16 - Neural Flashcards
What 3 parts of the brain?
Cerebrum
Cerebellum
Medulla
Whats another term for Volitional Contraction?
Voluntary: an Errerent Impulse
How do Volitional contractions work?
- modified by sensory info via cerebellum
- cross over (decussation) in medulla
- down a specific spinal tract (pyramidal)
- along spinal nerve
- by motor unit to specific muscle
What do the left and right sides of the brain control?
Right side of the brain controls left side of the body and what not
What type of feedback does coordinated movement require?
sensory feedback
How does sensory control of movement work?
From receptors to CNS (an afferent impulse)
- starts in receptor (pain, stretch, heat)
- via specific spinal tract (posterior column)
- decussation in medulla
- end in sensory cortex, offshoots to cerebellum
What are the primary senses?
- vision
- hearing
- smell
- taste
- touch
- kinetheisis
What is the knesthesis?
The system in the body that tells the brain where it and the limbs are relative to itself in space. there are two systems within
What are the two systems in the Kinesthetic sense?
Vestibular
Proprioreceptive
What is the Vestibular system?
signals where our body is in space
organized by semi-circular canals in the inner ear
What is the Proprioceptive system?
tells uswhere our body parts are relative to our body, in muscles, tendons and joint capsules
What do muscle spindles do?
sense stretch in muscle and are very sensitive to the rate of stretch (important for the proprioceptive system)
How does the stretch reflex contract?
contracts when the muscle spindle realizes its being stretched too fast. (called the mytatic stretch reflex)
What type of receptors senses muscle tension and stretch caused by contraction?
Tendon Receptors (golgi tendon organs)
What is the inverse myotatic reflex?
tension on tendon causing reflexive inhibition of muscle being contracted, the golgi tendon organs are inhibiting
