Simple Reflexes Flashcards
What are neural reflexes?
Stereotyped, involuntary, rapid reactions of the CNS to specific sensory input
General functions of reflexes
- Protective
- Postural control
- Homeostasis
General reflex arc steps
- Sensory receptor
- Afferent
- (Integration)
- Efferent
- Effector
What reflexes control posture and how?
- Simple stretch reflexes (myotatic)
- Adjust degree of skeletal muscle contractions
What are the sensory receptors for simple stretch reflexes?
Proprioceptors
Types of proprioceptors
- Muscle spindles
- Golgi tendon organs
Where are muscle spindles found?
Skeletal muscle
Are muscle spindles monosynaptic or polysynaptic?
Monosynaptic (no interneurone)
How do muscle spindles prevent damage to muscle?
As muscle is stretched they cause it to contract, so it doesn’t tear
Where are the nerve endings of golgi tendon organs found?
Tendons
Are golgi tendon organs monosynaptic or polysynaptic?
Polysynaptic (have interneurone)
What type of interneurone do golgi tendon organs have?
Inhibitory
How do golgi tendon organs prevent damage to muscle?
As tendon is stretched to max, inhibitory interneurone stops contraction and activity stops
What type of reflex does a golgi tendon organ use?
Reverse myotatic reflex
