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.n many synapses, the presynaptic part is located on an axon, but some postsynaptic sites are located on a dendrite or soma. Astrocytes also exchange information with the synaptic neurons, responding to synaptic activity and, in turn, regulating neurotransmission.