Purpose: To Test for the presence of shoulder instability. Test position: Sitting or standing. Performing the Test: The examiner grasps the wrist of the patient's elbow and pulls the arm distally. Observation is made of the amount of sulcus (space between the acromion process and humeral head) that is present with the distal arm pull. A positive test is considered for multidirectional instability if 1-2 cm of sulcus is noted. Diagnostic Accuracy: Unknown.
> Synapsis (also called syndesis) is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
Synapse Structure. 1  The part of the synapse that belongs to the receiving neuron is called the postsynaptic membrane. 2  The space between the two is called the synaptic cleft. 3  It is approximately 20 nm wide (20 x 10 -9 m).he transmission of information is accomplished in two ways: 1  Electrically: the neuron is directly adjacent to other neurons. 2  Chemically: there is a space (the synaptic cleft) between the axon terminus and the adjacent neuron.