What is the effector involved in patellar reflex?
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What is the effector involved in patellar reflex?
Smooth muscle, cardiac muscle and glands are the effectors for what type of reflex? Autonomic reflexes. Produced by gently striking the patellar ligament, results in extension of leg at knee joint.
What causes the patellar reflex?
The knee-jerk reflex, also known as the patellar reflex, is a simple reflex that causes the contraction of the quadriceps muscle when the patellar tendon is stretched. I describe the course of the reflex arc from muscle spindles in the quadriceps muscle to motor neurons that cause movement of the leg.
What kind of receptors are the tendon reflexes?
The Golgi tendon reflex, which is a reflex to extensive tension on a tendon; it functions to protect musculoskeletal integrity. The sensory receptors for this reflex are anatomically located deep in the tendon, while the sensory receptors for the MSR are inside the muscle.
Which nerve does the patellar reflex test?
The patellar tendon reflex tests the function of the femoral nerve and spinal cord segments L2-L4. The absence or decrease of this reflex is known as Westphal’s sign.
Where are the sensory receptors of the knee-jerk reflex located?
16 Cards in this Set
| routes followed by nerve impulses as they pass through nervous system | nerve pathways |
|---|---|
| effector muscle of knee-jerk reflex are located in —- muscle | quadriceps femoris |
| knee-jerk reflex helps body maintain | upright posture |
| sensory receptors of withdrawal reflex are located in the | skin |
Where are the sensory stretch receptors of the patellar reflex located?
20 Cards in this Set
| a withdrawal reflex employs … | motor neurons in conjunction with sensory and motor neurons |
|---|---|
| are located in the skeletal muscle | the sensory stretch receptors (muscle spindles) of the patellar reflex arc |
| the dorsal root of a spinal nerve contains | the sensory neurons |
What neurons are involved in the knee jerk?
The monosynaptic knee-jerk reflex skips the interneuron, so it involves the sensor, sensory neuron, motor neuron, and muscle fiber (Figure 2). In a monosynaptic reflex, the message travels from the sensory neuron to the motor neuron with only one synapse.
What nerve is responsible for knee reflex?
Although the knee jerk reflex is mediated by the L3 and L4 nerve roots, evidence exists that altered knee jerk expression may occur with exclusively L5 radiculopathy.
What is the receptor which initiates a flexor withdrawal reflex?
cutaneous receptors
Withdrawal reflexes coordinated by painful stimuli The flexor reflex is initiated by cutaneous receptors, involving an entire limb. This is exemplified by pulling the hand back from a hot object, via flexing of the arm. Spinal flexor reflex pathways are slightly inhibited from descending influences of the brainstem.
What nerve is carrying the afferent and efferent impulses in knee jerk reflex?
Stack #199448
| Question | Answer |
|---|---|
| What nerve is carrying the afferent and efferent impulses in the patellar stretch reflex? | femoral nerve |
| Cross-extensor reflex | more complex than the stretch reflex. It consists of a flexor, or withdrawal, reflex follow by extension of the opposite limb. |
What nerve is involved in the knee jerk reflex?
What nerve is carrying the afferent and efferent impulses in patellar reflex?
Is interneurons involved in knee-jerk reflex?
The monosynaptic knee-jerk reflex skips the interneuron, so it involves the sensor, sensory neuron, motor neuron, and muscle fiber (Figure 2).
What is the stimulus in the patellar reflex?
Tapping the patellar tendon stretches the quadriceps muscle and causes the sensory receptor of the muscle, called a spindle fiber, to send a signal along the afferent neuron to the spinal cord.
What is the motor neuron in patellar reflex?
Striking the patellar tendon with a reflex hammer stretches the muscle spindle in the quadriceps femoris muscle; this produces a signal that synapses directly onto an alpha-motor neuron at the level of L3 or L4 in the spinal cord.
Which nerve Innervates the effectors of the patellar reflex?
femoral nerve
The quadriceps femoris reflex also called the patellar reflex, is elicited by inducing rapid stretch in the common quadriceps tendon distal to the patella (technically the patellar ligament, but in this functional context, the quadriceps femoris tendon), sending an afferent action potential to the spinal cord via the …
Is patellar reflex somatic or autonomic?
Autonomic Reflexes
Autonomic Reflexes Activity 1- Patellar reflex The patellar tendon reflex or knee-jerk reflex is a monosynaptic stretch reflex that assesses the nervous tissue between (and including) the L2 and L4 segments. It can be done by tapping the patellar ligament (just below the knee) with a reflex hammer.
What neurons are involved in the knee-jerk?
What nerve is carrying the afferent and efferent impulses in the patellar reflex?
What nerve is involved in the patellar reflex?
The patellar reflex is a deep tendon response that is mediated by spinal nerves from levels L2, L3, and L4 in the spinal cord, most notably in the root L4. It is also called the quadriceps reflex because it is activated when you squeeze the quadriceps muscle of the leg.
What is the mechanism of action of the patellar muscle?
Mechanism. Striking the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L3 in the spinal cord, completely independent of higher centres.
How does a reflex hammer stretch the patellar tendon?
Striking the patellar tendon right below the patella with a reflex hammer stretches the muscular spindle in the quadriceps muscle. This generates a signal that is fully independent of higher centers and goes back to the spinal cord and synapses (without interneurons) at the level of L3 or L4 in the spinal cord.
What is a patellar reflex test?
The patellar reflex is a deep tendon reflex, mediated by the spinal nerves from the levels L2, L3, and L4 in the spinal cord, predominantly in the root L4. The patellar reflex test is performed to determine the integrity of the neurological function, which is accomplished by hitting the patellar tendon below the knee cap with a test hammer [2].
