The reflex with the simplest structure in medicine is called the intrinsic reflex. This means that the reflex occurs in the very place where it was triggered. An example of this is the patellar tendon reflex in the area of the kneecap, which is caused by a light blow on the same. What is an … Intrinsic Reflex: Function, Tasks, Role & Diseases
Stretch receptors measure tension in tissues to detect stretch in a muscle or organ. Their main function is overstretch protection, which is provided by the monosynaptic stretch reflex. The stretch receptors may show structural changes in the context of various muscle diseases. What are stretch receptors? Receptors are proteins of human tissues. They respond to … Stretch Receptors: Structure, Function & Diseases
The sarcomere is a small functional unit within the muscle: Lined up one behind the other, they form the filament-like myofibrils that are grouped together to form muscle fibers. Electrical stimulation by nerve cells causes the filaments within a sarcomere to push into each other, causing the muscle to contract. What is the sarcomere? There … Sarcomere: Structure, Function & Diseases
A Ranvier lacing ring is a ring-shaped interruption of the fat or myelin sheath surrounding nerve fibers. In the course of “saltatoric excitation conduction” it serves to increase the speed of nerve conduction. Saltatoric, from Latin: saltare = to jump refers to the “jump” of an action potential that takes place when it encounters a … Ranvier lacing ring
Motoneurons are the nerve cells responsible for the formation and coordination of movements. According to the location of the motoneurons, a distinction is made between the “upper motoneurons”, which are located in the cerebral cortex, and the “lower motoneurons”, which are located in the spinal cord. The lower motor neuron The lower motoneuron is located … Motor neuron
The Piotrowski reflex is a foot reflex of the tibialis anterior muscle. It is physiologically present only weakly or not at all. Increased reflex movement may indicate neurologic damage in the pyramidal tracts of the spinal cord. What is the Piotrowski reflex? The Piotrowki reflex occurs after a blow to the distal end of the … Piotrowski Reflex: Function, Tasks, Role & Diseases
The sternocleidomastoid muscle is also known as the great head turner and is one of the ventral superficial neck muscles located between the sternum, base of the skull, and clavicle. The main function of the bilateral muscles is lateral flexion of the head toward the shoulder, which is made possible by unilateral contraction. Lesions of … Sternocleidomastoid Muscle: Structure, Function & Diseases
The praecentral gyrus is a part of the brain and is home to the primary motor cortex, which is interconnected with central motor neurons and the pyramidal tracts. The area of the brain is considered the center of movement control. In lesions, irreversible movement disorders, spasticity, or paralysis often occur. What is the praecentral gyrus? … Praecentral Gyrus: Structure, Function & Diseases
The Mendel-Bechterew reflex is a foot reflex from the Babinski group that is categorized as a pyramidal tract sign. The pathologic reflex movement may suggest damage to the central motor neurons. Such damage presents, for example, in the context of amyotrophic lateral sclerosis (ALS). What is the Mendel-Bechterew reflex? For example, when the top of … Mendel-Bechterew Reflex: Function, Tasks, Role & Diseases
