What is the receptor for the Achilles reflex?
What is the receptor for the Achilles reflex?
By tapping the tendon with a reflex hammer, a subsequent lengthening (stretch) in the triceps surae muscle occurs, causing the stretch receptors in the muscle spindle to be activated and propagate an excitatory stimulus.
What is the effector muscle in the ankle jerk Achilles reflex?
The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsiflexed. It is a type of stretch reflex that tests the function of the gastrocnemius muscle and the nerve that supplies it.
What nerve does Achilles reflex test?
and the Achilles reflex or ankle jerk reflex, mediated by S1 through the sciatic (tibial) nerve and elicited by tapping the tendon of the gastrocnemius muscle (Fig. 33.22D).
What effector muscle is involved in a calcaneal reflex?
20 Cards in this Set
| a withdrawal reflex employs … | motor neurons in conjunction with sensory and motor neurons |
|---|---|
| calcaneal reflex (effector muscle involved) | calf |
| slight twitch of muscle or flexion of the forearm | biceps reflex (response observed) |
| biceps reflex (effector muscle involved) | biceps |
What is the receptor which initiates a stretch reflex?
the muscle spindle
The receptor responsible for initiating a stretch reflex is the muscle spindle. Muscle spindles are found in almost all skeletal muscles and are particularly concentrated in muscles that exert fine motor control (e.g., the small muscles of the hand and eye).
What is the receptor involved in the plantar reflex?
Plantar Reflex- The plantar reflex is elicited by stimulating the cutaneous receptors in the sole of the foot. In adults, stimulation of these receptors causes the toes to flex and move closer together.
What is the efferent pathway in Achilles reflex?
A motor, or efferent, neuron sends a nerve impulse along an efferent pathway from the integration center to an effector cell. The effector cell responds to efferent impulses (for example, by contracting, if the effector is a muscle fiber).
What is the effector of the patellar reflex?
The quadriceps femoris is the effector muscle of the patellar reflex.
How do you test for Achilles tendon reflex?
How to Assess the Achilles Deep Tendon Reflex
- Find the achilles tendon.
- Locate the heel of the foot and dorsiflex the foot. The achilles is found right above the heel.
- Now have the patient dangle the foot while you dorsiflex it.
- While the foot is dorsiflex, tap with the reflex hammer briskly on the achilles tendon.
What are the components of the Achilles reflex arc?
The deep tendon reflex arc is divided into the upper motor neuron (UMN) component and the lower motor neuron (LMN) component.
What does the Golgi tendon reflex do?
The Golgi tendon reflex operates as a protective feedback mechanism to control the tension of an active muscle by causing relaxation before the tendon tension becomes high enough to cause damage.
How gamma efferent activation affects the stretch reflex?
Gamma motor neurons regulate the gain of the stretch reflex by adjusting the level of tension in the intrafusal muscle fibers of the muscle spindle. This mechanism sets the baseline level of activity in α motor neurons and helps to regulate muscle length and tone.
What is the effector in the pupillary reflex arc?
What is the receptor and effector in the pupillary reflex? The retina is the receptor and the effector is the smooth muscle of the iris. They both work together to restrict or enlarge the pupil according to how bright the light it.
Is the Achilles reflex spinal or cranial?
ii. Achilles Reflex- The Achilles, or ankle-jerk, reflex assesses the first two sacral segments of the spinal cord. The reflex is processed at this level and does not progress to the brain. The reflex is monosynaptic, two-neuron, reflex arc.
What nerve carries the afferent and efferent impulses in the knee jerk 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 …
How are the Achilles and knee-jerk reactions important in walking?
Reflexes are crucial in that they allow us to react fast to a potentially dangerous stimulus, such as a hot surface. Not only do reflexes keep us safe from harm, but they also are involved in daily activities, such as balancing when we walk.
What does absent Achilles reflex mean?
Your doctor will use a rubber hammer to tap firmly on the Achilles tendon, which connects the muscle at the back of your calf to your heel bone. In a normal test, your foot will move as though you were going to point your toes. A decreased or absent reflex may mean that there is compression in the S1 region.
What stimulates tendon reflexes?
Tendon reflexes are single synapse reflexes. A rapid stretch of the muscle stimulates the muscle spindles and this message is conveyed via the sensory root to the spinal cord at the segmental level of the muscle stimulated.
What triggers the inverse stretch reflex?
Quick Reference. A reflex action mediated by the Golgi tendon organs that, when the organs are stimulated by a prolonged stretch, cause the stretched muscle to relax.
What is an example of Golgi tendon reflex?
A well-known example of motor spinal reflex is the patellar tendon reflex. The stimulus detected by the sensory nerve endings in the Golgi tendon organ in the patellar tendon is transmitted by the afferent fibers onto the spinal cord.
What is the mechanism of reflex action of the Achilles tendon?
This reflex is mediated by the S1 spinal segment of the spinal cord. Ankle of the patient is relaxed. It is helpful to support the ball of the foot at least somewhat to put some tension in the Achilles tendon, but don’t completely dorsiflex the ankle. A small strike is given on the Achilles tendon using a rubber hammer to elicit the response.
What is the grade of Achilles reflex?
The response is also graded into Grade 0-4 according to the reflex grading system. The Achilles reflex checks if the S 1 and S 2 nerve roots are intact and could be indicative of sciatic nerve pathology. It is classically delayed in hypothyroidism.
How do you interpret the Achilles reflex?
As for all deep tendon reflexes, the Achilles reflex is then interpreted by grading the response using a 0 to 4 scale and by comparing to the contralateral limb and nearby reflexes.
What causes the Achilles reflex to be delayed?
The Achilles reflex checks if the S 1 and S 2 nerve roots are intact and could be indicative of sciatic nerve pathology. It is classically delayed in hypothyroidism. This reflex is usually absent in disk herniations at the L 5 —S 1 level. A reduction in the ankle jerk reflex may also be indicative of peripheral neuropathy. Common causes
