The tectal neuropil contains structures including periventricular neurons axons and dendrites. Both stellate and basket cells form GABAergic synapses onto Purkinje cell dendrites. Neurons do not immediately form neural circuits through the growth of axons and dendrites. Actin is predominately found at the tips of axons and dendrites during neuronal development. The cell membrane of neurons covers the axons, cell body, dendrites, etc. There are different internal structural characteristics between axons and dendrites. In some species, axons can emanate from dendrites known as axon-carrying dendrites. The axons, dendrites, and neurons wear out in many cases. Some types of neurons have no axon and transmit signals from their dendrites. A neuron consists of a cell body, axon, and dendrites. III pyramidal apical dendrites in rat and primate models. An autapse is a synapse in which a neuron's axon connects to its own dendrites. A typical neuron consists of a cell body (soma), dendrites, and a single axon. Within these cells, some also inhibit specific pyramidal cell dendrites. The contacts between mossy fibers and granule cell dendrites take place within structures called glomeruli.