Which is an example of a Polysynaptic reflex?
The flexor reflex is a polysynaptic reflex that results in flexor muscle contraction. It is elicited by afferent stimuli collectively known as flexor reflex afferents (FRAs).
What is a Polysynaptic neuron?
Reflex arcs that contain only two neurons, a sensory and a motor neuron, are considered monosynaptic. Most reflex arcs are polysynaptic, meaning multiple interneurons (also called relay neurons) interface between the sensory and motor neurons in the reflex pathway.
What’s a Polysynaptic reflex?
Any reflex with more than one synapse (1), not counting the synapse between neuron and muscle, and hence involving one or more interneurons. In humans, all reflexes except stretch reflexes are polysynaptic.
What are the general characteristics of Polysynaptic reflexes?
5 general characteristics of polysynaptic reflexes.
- Involve pools of neurons.
- Are intersegmental in distribution.
- Involve reciprocal inhibiition.
- Have reverberating circuits: -which prolong reflexive motor response.
- Several reflexes co-operate:
Why are Polysynaptic reflexes slower?
Polysynaptic reflexes are slower than monosynaptic reflexes for 2 reasons: This specific type of sensory fiber that carries in the information in the dorsal root for monosynaptic reflexes is very large, fast, heavily myelinated fibers. They conduct faster. slowest conducting of all fibers.
Is the stretch reflex Monosynaptic or Polysynaptic?
The stretch reflex consists of a monosynaptic response from the direct connection between Ia afferents and motor neurons, that may be followed by polysynaptic reflex activity.
Is the flexor reflex Monosynaptic or Polysynaptic?
Which reflex is responsible for Polysynaptic excitation of contralateral extensors?
Which reflex is responsible for polysynaptic excitation of contralateral extensors? The answer is C. Flexor withdrawal is a polysynaptic reflex that is used when a person touches a hot stove or steps on a tack.
What is the difference between monosynaptic and polysynaptic reflexes?
When a reflex arc consists of only two neurons, one sensory neuron, and one motor neuron, it is defined as monosynaptic. Monosynaptic refers to the presence of a direct single synapse. No interneuron is present. By contrast, in polysynaptic reflex arcs, one or more interneurons connect afferent (sensory) and efferent (motor) signals.
What is a polysynaptic reflex pathway?
in polysynapticreflex pathways, one or more interneurons connect afferent (sensory) and efferent (motor) signals. All but the most simple reflexes are polysynaptic, allowing processing or inhibition of polysynaptic reflexes within the spinal cord The Patellar Reflex
What are the types of reflexes in the spinal cord?
Spinal reflex 1 Basics. The spinal cord is phylogenetically older than most structures of the brain, which means that reflexes are in charge of carrying out functions that the organism needs the most. 2 Monosynaptic reflex. The monosynaptic reflexes consist of two neurons. 3 Polysynaptic reflexes.
Which of the following is an example of reflex?
Sneezing and Blinking are two examples of Reflexes. 1. . A Reflex produces a rapid MOTOR RESPONSE to a STIMULUS because the Sensory Neuron Synapses DIRECTLY with a MOTOR NEURON in the Spinal Cord. 2. REFLEXES are very fast, and Most Reflexes Never Reach the Brain.