A steerable overtube assembly for a robotic surgical system can include a steerable shaft having one or more instrument channel and a control hub configured to mount to the steerable shaft. The assembly can also include a manual actuator extending from the control hub and configured to allow the steerable shaft to be manually steered by a user's hand, and a robotic actuator housed by and/or extending from the control hub configured to connect to a robotic driver to allow robotic steering of the steerable shaft.