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.
The word synapse â from the Greek synapsis (ÏÏÎ½Î¬ÏÏÎ¹Ï), meaning conjunction, in turn from ÏÏÎ½Î¬ÏÏÎµá½¶Î½ (ÏÏÎ½ (together) and á¼ÏÏÎµÎ¹Î½ (to fasten)) â was introduced in 1897 by English physiologist Michael Foster at the suggestion of English classical scholar Arthur Woollgar Verrall. In an electrical synapse, the presynaptic and postsynaptic cell membranes are connected by special channels called gap junctions that are capable of passing electric current, causing voltage changes in the presynaptic cell to induce voltage changes in the postsynaptic cell.