So if we remove the organs, the
kidneys, the spleen, the pancreas
the suprarenal glands. If we remove
all the organs within the abdomen
and all the arteries and their branches and we
are just left with the muscles. We can see a whole
series of beautiful nerves which are
radiating away from the spinal cord
through the intervertebral foramen.
And we have a number of
these somatic nerves.
And these contain sensory and
motor fibers that supply
the skeletal musculature and
the skin of the abdomen.
So these are containing sensory
fibers that are taking cutaneous
information back from the skin and also
motor fibers that make the muscles contract.
As a somatic nerve that's passing to the body wall
there is also going to be some sympathetic fibers
that control the hairs,
that control the sweat glands.
But we don't have any
These nerves that are running
down to the posterior abdominal wall
and we can see a few here. We have
got a subcostal nerve, this is T12.
That's the most, that's the last
nerve to originate from the
thoracic segment of the spinal cord.
Then we have iliohypogastric and ilioinguinal.
These are both derived from the L1
spinal cord segment iliohypogastric and ilioinguinal.
We can then see we have
the genitofemoral nerve.
The genitofemoral nerve is passing out
through the psoas major here.
And the genitofemoral nerve
splits into a genital branch
and into a femoral branch. And these
two blood vessels these two nerves
pass through the psoas major one
then runs along the inguinal canal
runs within the spermatic cord of
the inguinal canal to supply the
skin around the scrotum
around the labia if
it’s in the female.
And the femoral branch passes
through the fascia of the thigh
to supply discreet region
on the anterior surface of the thigh.
The genitofemoral nerve
comes from the L1 and L2.
We also have the lateral cutaneous nerve of
the thigh, which we can see radiating down here.
We can have the obturator nerve. The obturator nerve
is really important coming from L2
L3, L4. And that supplies
the adductor portion of
of the musculature in lower limb. The adductor,
the medial portion, it leaves the
pelvis by passing through the obturator
foramen and the obturator canal.
which is the defect in the obturator fascia.
So it runs along the lateral wall of the pelvis.
And we can pick up obturator nerve
coming down in this direction.
and see it passing through obturator canal.
That's important, like I said to
supply the medial compartment. We also
have the femoral nerve L2, L3, L4 again.
And the femoral nerve which we can
pick up here is quite a large branch
it runs lateral to the psoas major
muscles and it extends down into the
anterior compartment of the thigh
where it goes on to supply
the anterior musculature of the thigh so
rectus femoris and your quadraceps.
We also have the lumbosacral trunk
which is from L4 to L5.
So we can see we have a whole series
of nerves radiating along the posterior
abdominal wall which are really
important in maintaining the function of the
muscles within the posterior
abdominal wall and elsewhere;
and carry important sympathetic fibers
to the body wall as well.
It'll also going to be containing cutaneous
information via the sensory fibers
taking information about pain, touch,
temperature back to the central nervous system.