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.
1 A synapse is the point of connection between the endfoot of one neuron and the membrane of another. The word is derived from Greek and means to fasten together.. It is at synapses that one cell influences the activity of another.  There are two broad categories of synapses: chemical synapses and electrical synapses.