Well finally, let me just show
you a picture of the wall of the gut.
You see on the left-hand side, on the very top
dark pink area, that is part of the muscle
wall of the gut. The material down below represents
large folds in the gut and finally the gut
mucosa. We will cover that in more detail
when we talk about the gut in a later lecture.
But if you look very carefully in the middle
of the wall of that muscle, the muscularis externa, you
can see tiny little ganglion cells. They
represent the enteric ganglia. That independent
network of nerve cells that control the contraction
of that musclaris externa muscle area as well
as another muscle layer you can barely see.
They are called the musclaris mucosa.
But again I will talk to you in detail about that
when we look at the digestive system in a
So in summary, it is important for you to be
able to describe the motor pathways, both
the somatic motorways and the visceral motor
pathways. And also be able to recognize in
the spinal cord what structural components
those pathways relate to. Similarly you should
know the sensory pathways, both the somatic
sensory and the visceral sensory pathways.
And again also be able to locate within the
spinal cord where those pathways travel and
what structural components in the spinal cord
relate to those sensory pathways. It is very
important that you understand the functional
significance of ganglia and also their structures.
And be able to differentiate between a sensory
ganglion or dorsal root ganglion and ganglia
belonging to the synthetic components of the
autonomic nervous system and the parasympathetic
components of the autonomic nervous system.
So thank you for listening to this lecture.