diff --git a/csys.lisp b/csys.lisp
index 34a32c7..295d468 100644
--- a/csys.lisp
+++ b/csys.lisp
@@ -4,10 +4,14 @@
   (:use :common-lisp)
   (:local-nicknames (:actor :scopes/core/actor)
                     (:util :scopes/util))
-  (:export #:cell #:system))
+  (:export #:neuron #:synapse))
 
 (in-package :decons/csys)
 
-(defun cell (mh &key state conns)
+(defun neuron (proc &key state syns)
   (actor:create 
-    (lambda (msg) (funcall mh state conns))))
+    (lambda (msg) (funcall proc msg state syns))))
+
+(defun synapse (rcvr &optional (op #'identity))
+  (lambda (msg)
+    (actor:send rcvr (op msg))))
diff --git a/test-csys.lisp b/test-csys.lisp
index 5513d3b..0f6ea88 100644
--- a/test-csys.lisp
+++ b/test-csys.lisp
@@ -2,5 +2,13 @@
 
 (in-package :decons/test-decons)
 
+(defun probe (msg state syns)
+  (let ((t:*test-suite* state))
+    (== (actor:content msg) 42)))
+
 (deftest test-neuron ()
-  (== 1 1))
+  (let ((prb (csys:neuron #'probe :state t:*test-suite*)))
+    (actor:send prb (actor:message 42))
+    (sleep 0.2)
+    (actor:stop prb)
+    ))
diff --git a/test-decons.lisp b/test-decons.lisp
index 9e92976..7b1ddc1 100644
--- a/test-decons.lisp
+++ b/test-decons.lisp
@@ -2,7 +2,8 @@
 
 (defpackage :decons/test-decons
   (:use :common-lisp)
-  (:local-nicknames (:csys :decons/csys)
+  (:local-nicknames (:actor :scopes/core/actor)
+                    (:csys :decons/csys)
                     (:mlx :decons/mlx)
                     (:r :decons/recurse)
                     (:xplore :decons/xplore)