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diff --git a/code/core/synapse.h b/code/core/synapse.h
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+#ifndef SYNAPSE_H
+#define SYNAPSE_H
+
+#include <boost/intrusive/slist.hpp>
+
+using namespace boost::intrusive;
+
+class Neuron;
+
+class Synapse {
+public:
+  Synapse();
+
+  // functions
+  void computePostsynapticPulse(double &time, double &current); // given an input time and current calculate their output value
+  void evolve(double time);
+  void stdp(double dt);
+  static void updateTopology(); // recreate all sin/sout lists in the neurons
+
+  // reflection
+  template<class Action> bool reflect(Action &a);
+  typedef int id_type;
+  static id_type numElements();
+  static Synapse * singleton(id_type num); // return neuron # num
+  static id_type numSynapses;
+
+  // model specifics
+  int src, dst;       // pre- and postsynaptic neuron
+  double weight;      // [V]
+  double eligibility; // [?]
+  double delay;       // total delay from presynaptic axon hillock to postsynaptic axon hillock
+  bool constant;      // if the weight can change (HINT: weight < 0 implies constness, too)
+
+  // sim helper vars
+  double firstSpike,   // time the first/last spike arrived at it's dst neuron in a given interval
+         lastSpike;    // HINT: firstSpike is set to -INFINITY every time after it is processed
+                       // by the STDP rule
+  double evolvedUntil; // up to wich time has the model been evolved
+
+  // hock to use intrusive lists (defined in neuron.h)
+  slist_member_hook<> hook_src, hook_dst;  
+};
+
+const int maxSynapses = 200000;
+Synapse syn[maxSynapses];
+
+
+#endif // SYNAPSE_H