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.
synapse - the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle; nerve impulses cross a synapse through the action of neurotransmitters. 1  myoneural junction, neuromuscular junction - the junction between a nerve fiber and the muscle it supplies.