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Striking the patellar tendon with a tendon hammer just below the patella stretches the muscle spindle in the quadriceps femoris muscle. This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L4 in the spinal cord, completely independent of higher centres. From there, an alpha-motor neuron conducts an efferent impulse back to the quadriceps femoris muscle, triggering contraction. This contraction, coordinated with the relaxation of the antagonistic flexor hamstring muscle causes the leg to kick. This reflex is a reflex of proprioception which helps maintain posture and balance, allowing to keep one's balance with little effort or conscious thought.
The patellar reflex is a clinical and classic example of the monosynaptic reflex arc. There is no interneuron in the pathway leading to contraction of the quadriceps muscle. Instead the bipolar sensory neuron synapses directly on a motor neuron in the spinal cord. However, there is an inhibitory interneuron used to relax the antagonistic hamstring muscle.
What else can I help you with?
Another name for the patellar reflex is the?
the knee-jerk reflex
What reflex is the knee jerk reflex an example of?
knee jerk aka patellar reflex is an example of a stretch reflex
An example of a reflex?
knee-jerk reflex
What is the stimulus for the knee jerk flex?
The stimulus for the knee jerk reflex, also known as the patellar reflex, is the stretching of the patellar tendon when the knee is tapped just below the kneecap. This stretch activates sensory neurons that send signals to the spinal cord. In response, motor neurons are triggered, causing the quadriceps muscle to contract and resulting in the quick extension of the lower leg. This reflex helps maintain posture and balance.
Knee jerk is an example of a?
Reflex
Which of the following is not correct regarding the patellar knee jerk reflex?
The statement "The patellar knee jerk reflex is controlled by the brain" is not correct. The patellar knee jerk reflex is actually a spinal reflex, meaning it does not involve the brain in its initial response.
During a knee-jerk reflex the nerve impulse is received by the?
The knee-jerk reflex is controlled by the interneurons in the spinal cord.
Is the knee jerk a simple reflex?
yes it is
A simple reflex is?
A simple reflex is an automatic response to a stimulus without involving conscious thought. An example is the knee jerk reflex when a doctor taps below the kneecap, causing the leg to kick involuntarily.
Which of these is a reflex?
The knee-jerk reflex is a common example of a reflex. It occurs when the knee is tapped and the leg kicks out involuntarily in response.
What is meant by the term ''reflex''?
A reflex is an automatic or involuntary response to a stimulus, typically involving a sensory nerve and a motor nerve. It is a rapid and predictable reaction that helps protect the body from harm. Examples include the knee-jerk reflex and the pupillary reflex.
What is a normal reaction for the patellar reflex?
knee jerk
