Axon Initial Segment


Axon Hillock

Axon Hillocks

Axon Initial Segments

Axonal Trigger Zone

Axonal Trigger Zones

Trigger Zone, Axonal

First segment of axon that connects distal axon segments to the neuronal CELL BODY at the axon hillock region. The axon initial segment is not protected by the MYELIN SHEATH and has properties critical for axonal growth. The axon initial segment and the axon hillock form an axonal trigger zone.