What is the stretch reflex pathway?
The Monosynaptic Stretch Reflex
The pathway starts when the muscle spindle is stretched (caused by the tap stimulus in the knee jerk reflex). The muscle spindles are responsible for detecting the length of the muscles fibres. When a stretch is detected it causes action potentials to be fired by Ia afferent fibres.
Which is the correct sequence in a stretch reflex arc?
So, the correct answer is ‘Receptors – Sensory neuron – Spinal cord – Motor neuron – Muscle’
What are the major components of a stretch reflex?
It is mediated by just two neurones – one afferent and one efferent – which are linked to form amonosynaptic reflex arc (Fig. 8.12). The reflex arc consists of afferent neurones that convey impulses from muscle stretch receptors to the CNS and motor neurones that convey impulses back to the muscle.
What are the 5 components a reflex test?
Figure 3 – Reflex path showing the five components of a reflex: sensor, sensory neuron, interneuron, motor neuron, and muscle. The simple reflex is shown on the inner part of the diagram. Action potentials are how information is transmitted in the nervous system.
What is the first step of a reflex?
In a simple reflex, a neuron brings information about a stimulus to the brain or spinal cord and connects with a motor neuron. The motor neuron sends out a message to a muscle. The muscle responds to that message by contracting.
What are the 5 deep tendon reflexes?
There are five primary deep tendon reflexes: bicep, brachioradialis, triceps, patellar, and ankle. Each reflex corresponds to a particular root and muscle and will evaluate the integrity of the root and associated nerve. NINDS grading of DTR ranges from 0 to 4.
What are the 5 steps of a reflex arc?
So the reflex arc consists of these five steps in order-sensor, sensory neuron, control center, motor neuron, and muscle. These five parts work as a relay team to take information up from the sensor to the spinal cord or brain and back down to the muscles.
What are the 4 steps of a reflex action?
Reflex actions
- Receptor in the skin detects a stimulus (the change in temperature).
- Sensory neurone sends impulses to relay neurone .
- Motor neurone sends impulses to effector.
- Effector produces a response (muscle contracts to move hand away).
What are the 4 types of reflexes?
We have different types of reflexes in the body. Four key examples are the stretch reflex, the flexor reflex, the crossed-extensor reflex, and the Golgi tendon reflex.
What is the correct order for the components of a reflex arc quizlet?
receptor, sensory neuron, integration center, motor neuron, effector.
What are the 6 deep tendon reflexes?
After obtaining the reflex on one side, always go immediately to the opposite side for the same reflex so that you can compare them.
- Jaw Jerk. Place the tip of your index finger on a relaxed jaw, one that is about one-third open.
- Biceps Reflex.
- Triceps Reflex.
- Brachioradialis Reflex.
- Finger Jerk.
- Knee Jerk.
- Ankle Jerk.
What is the correct order of a reflex arc quizlet?
Place the following events of a reflex arc in the correct order: 1) motor neuron activation, 2) sensory neuron activation, 3) sensory receptor activation, 4) Information processing, 5) effector response.
What are the steps in a reflex action?
What are the main types of reflexes?
Types of human reflexes
- Biceps reflex (C5, C6)
- Brachioradialis reflex (C5, C6, C7)
- Extensor digitorum reflex (C6, C7)
- Triceps reflex (C6, C7, C8)
- Patellar reflex or knee-jerk reflex (L2, L3, L4)
- Ankle jerk reflex (Achilles reflex) (S1, S2)
What are 2 types of reflexes?
There are two types of reflex arcs: autonomic reflex arc (affecting inner organs) and somatic reflex arc (affecting muscles).
What is the correct order of events of a simple stretch reflex quizlet?
muscle spindles detect stretch.
What is Hoffman’s reflex?
Hoffman’s sign or reflex is a test that doctors use to examine the reflexes of the upper extremities. This test is a quick, equipment-free way to test for the possible existence of spinal cord compression from a lesion on the spinal cord or another underlying nerve condition.
What is the first stage of a reflex action?
SENSATION
Firstly, the whole point of a reflex is to create a QUICK reaction to a STIMULUS. So, the first stage of a reflex is SENSATION – i.e when you first touch the hot object the receptors in the skin will sense this and be stimulated.
What are the 2 types of reflexes?
Which is the correct order of events in a reflex arc quizlet?
Which of the following is the correct order of a simple spinal reflex arc?
The correct answer is (d) receptor, afferent neuron, integration center, efferent neuron, effector.
What does a positive Hoffmans mean?
A positive Hoffman sign indicates an upper motor neuron lesion and corticospinal pathway dysfunction likely due to cervical cord compression. However, up to 3% of the population has been found to have a positive Hoffman without cord compression or upper motor neuron disease.[2]
How do you perform a Hoffman’s reflex?
Hoffmann’s Sign or Reflex | Upper Motor Neuron Lesion – YouTube
What does 1+ reflexes mean?
1+ = a slight but definitely present response; may or may not be normal. 2+ = a brisk response; normal. 3+ = a very brisk response; may or may not be normal. 4+ = a tap elicits a repeating reflex (clonus); always abnormal.
How do you perform a Hoffman’s test?
Hoffman’s sign positive-How to perform the test – YouTube