Spinal Reflexes. Spinal reflexes include the stretch reflex, the Golgi tendon reflex, the crossed extensor reflex, and the withdrawal reflex.
What are the components of a spinal reflex?
The simplest example of a spinal reflex is the monosynapic reflex arc, having four components:
- A receptor (in this case, the muscle spindle).
- An afferent component (sensory input).
- A central component (spinal processing).
- An efferent component (motor output).
What are the five components of a spinal reflex?
FIGURE 7-1 A reflex arc contains five fundamental components: 1, a receptor; 2, a sensory neuron; 3, one or more synapses in the CNS; 4, a motor neuron; and 5, a target organ, usually a muscle.
What are spinal reflexes an example of?
Introduction. Spinal cord reflexes are simple behaviors produced by central nervous system (CNS) pathways that lie entirely within the spinal cord. The sensory afferent fibers that evoke these reflexes enter the spinal cord and activate spinal motor neurons directly or through a chain of one or more spinal interneurons …
What is a spinal reflex give two examples?
Walking, running, and typewriting are examples of activities that require large numbers of complex muscle coordinations that have become automatic. Nerve pathway of a simple reflex. When the sensory nerve ending is stimulated, a nerve impulse travels along a sensory (afferent) neuron to the spinal cord.
What is the simplest spinal reflex?
The stretch reflex (also known as the myotatic reflex) is routinely tested during the neurologic examination. It is a simple reflex with the afferent input resulting from change in muscle length received via the muscle spindle and transmitted by the Ia afferents.
How do you assess spinal reflexes?
To test your reflexes, your doctor will use a rubber hammer to tap firmly on the tendon. If certain reflexes are decreased or absent, it will show what nerve might be compressed. Not all nerve roots have a reflex associated with them.
What are 3 reflexes in humans?
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 is the advantage of the spinal reflex?
The advantage is that it frees the hands to throw a sharp rock or a spear at much higher velocities than locomotion. Experiments with lower animals show that part of locomotion control resides in pattern generators located in the spinal cord.
What is an example of Polysynaptic reflex?
An example of a polysynaptic reflex arc is seen when a person steps on a tack—in response, their body must pull that foot up while simultaneously transferring balance to the other leg.
What is true of spinal reflexes?
Spinal reflexes are automatic responses that occur without conscious effort. In fact, spinal reflexes do not even require the brain to occur. Reflexes above the neck, such as sneezing and blinking, are not spinal reflexes because they involve the lower part of the brain rather than the spinal cord.
What is the difference between spinal and cranial reflexes?
What is the difference between Cranial And Spinal Reflex? A cranial reflex is one that is controlled by one of the cranial nerves and tend to take place in the facial or head area. … A spinal reflex, on the other hand, is a reflex that involves only the spinal nerves and is not processed by the brain.