The term âshoulder instabilityâ is used to refer to the inability to maintain the humeral head in the glenoid fossa.The ligamentous and muscle structures around the glenohumeral joint, under non-pathological conditions, create a balanced net joint reaction force. The relevant structures are listed below.
Definition of synapse. : the point at which a nervous impulse passes from one neuron to another.
In 1921, it was confirmed that neurons mostly communicate by releasing certain chemicals. These chemicals are called neurotransmitters. So, neurotransmitters allow the nerve impulses or signals to travel across the synapse. A synapse is a small gap or junction between two neurons, or a neuron and a muscle cell.