Damage to the upper temporal lobe, lower parietal, or connection between the Wernicke's and Broca's areas
Wernicke's dysphasia is the most common of the receptive dysphasia
It is called saltatory conduction. This describes the "jumping" of an action potential from node to node on a myelinated axon.
The conduction starts at the pacemaker region called the Sinoatrial Node (SA node) which is just under where the superior vena cava enters the right atrium. From here the conduction passes to the Atrioventricular Node (AV node) which is just ot the right of the septum. From here the stimulation is passed through the Bundle of His which carries the conduction to the septum where two Bundle Branches pick it up. These branches carry the conduction to the base of the septum where they sperate into the Purkinje Fibres. These fibres carry the conduction all around the heart.
In Saltatory conduction, the signal leaps or hops from node of Ranvier to another. It uses less energy and it faster. In continuous conduction, the nerve is bare of myelin, moves in continuous waves and the signal is slower.
Dromotropic effect is the effect on conduction of current. It could be positive or negative depending on the final outcome. A negative dromotropic effect would mean decrease in conduction activity of current while positive would mean increase in conduction activity of current.
Conduction dysphasia
Associative dysphasia
Conduction dysphasia is a relatively uncommon disease (representing only 10% of the cases)
Transcortical dysphasia is caused by damage to the language-dominant brain that separates all or parts of the central region from the rest of the brain
Dysphasia can be prevented by avoiding the causes of brain injury and stroke, such as high blood pressure
Wernicke's dysphasia is the most common of the receptive dysphasia
Anomic dysphasia is also referred to as amnesic dysphasia
Broca's dysphasia is the most common type of expressive dysphasia
Expressive dysphasia
Anomic dysphasia
Receptive dysphasia
It results from damage to both the anterior and posterior regions of the language-dominant hemisphere