II Extrinsic Primary afferent Neurons The rich sensory innervation(神经支配) of the gastrointestinal tract comprise Intrinsic sensory neurons contained entirely within the gastrointestinal wall ☆ Intestinofugal fibres肠离心神经纤维 that project to prevertebral ganglia(椎前神经节) 8 Vagal and spinal afferent that projects to the central nervous system15 II Extrinsic Primary Afferent Neurons The rich sensory innervation (神经支配) of the gastrointestinal tract comprise: ❖Intrinsic sensory neurons contained entirely within the gastrointestinal wall ❖Intestinofugal fibres 肠离心神经纤维 that project to prevertebral ganglia (椎前神经节) ❖Vagal and spinal afferent that projects to the central nervous system