The vagus nerve and innervation of stomach

[Lothric]

Hey,

Look at the picture.

Apparently, the vagus nerve directly innervates the relevant cells. But the picture shows a synapse, doesn't it, before the nerves innervate the G and parietal cells? Isn't this a synapse in the Auerbach or Submucosal plexus? If so, then it's not the vagus nerve anymore innervating those cells. But my textbooks claim it is. What am I missing?

---

Members don't see this ad.

 

[jcve34]

Hey,

Look at the picture.

Apparently, the vagus nerve directly innervates the relevant cells. But the picture shows a synapse, doesn't it, before the nerves innervate the G and parietal cells? Isn't this a synapse in the Auerbach or Submucosal plexus? If so, then it's not the vagus nerve anymore innervating those cells. But my textbooks claim it is. What am I missing?

Post ganglionic fibers of the vagus nerve provide extrinsic innervation through the ENS (myenteric and submucosal plexuses).

 

[Lothric]

Post ganglionic fibers of the vagus nerve provide extrinsic innervation through the ENS (myenteric and submucosal plexuses).

Exactly! That's what I thought. But when they said "directly" I thought they meant that the vagus nerve branches off and those branches innervate their target directly without any synapse with other neurons.

Take a look at the branch that innervates D cells (new upload, the first one was from an old FA). What happens there? No synapse with the enteric nervous system at all?

 

[jcve34]

Exactly! That's what I thought. But when they said "directly" I thought they meant that the vagus nerve branches off and those branches innervate their target directly without any synapse with other neurons.

Take a look at the branch that innervates D cells (new upload, the first one was from an old FA). What happens there? No synapse with the enteric nervous system at all?

I think Somatostatin might be an exception or the picture is just too general. But that’s a fair point. DIdnt even notice that