hello all this is dr alsup and to finish off our supplementary dissection videos we're going to
talk about some of that small vasculature that you're going to find either right on top of the
spinal cord or very closely associated to it so we're going to start with the vertebral venous
plexus specifically a internal vertebral venous plexus which these will be located within the
vertebral canal so the this particular dissection has been a laminectomy so we're looking into the
epidural space because this is dura mater right here and you can see this epidural fat this is uh
pretty clear and distinguishable between all these structures in this area which does look like uh a
lot of stuff that is hard to distinguish i'm not going to to lie to you there these are these deep
back muscles and then all the tendons associated with that but you can start understanding that we
are getting into these deeper structures and you can see the dura mater so the epidural fat will
be located in here and then you can see kind of these different regions of this darker blue
and this will be associated with or this will be the posterior internal vertebral venous plexus you
would have an anterior internal vertebral venous plexus on the anterior side of the dura mater but
since we're looking at a posterior view here this is going to be the posterior now we have opened
up the dura and still looking at a posterior view because that's how our dissection has occurred so
the dura mater has been opened and kind of pinned to the side we're looking at the spinal cord
directly here and you can see the very distinct blue and that those will be parts of the veins
and you will see it kind of all over the place typically you have around three posterior spinal
veins kind of running down the region there can be variability there veins are considerably easier
or more obvious to see associated with the spinal cord you can see i'm going to outline a little bit
of where one of the the posterior spinal artery you can typically have two but this one is the
only one that's kind of visible in this image so veins are are going to be where it's at in
terms of visibility and then you'd have to get a really close view in order to see the arteries
in order to see the anterior spinal arteries or veins you would have to reflect the spinal cord
up in order to see the anterior view so this is going to be the posterior portion of the spinal
cord this will be the posterior portion of the spinal cord and you can see that the spinal cord
has been reflected up and now we're looking at the anterior portion and so this is dura mater here as
well this whole thing is dura mater you're seeing more more anterior portions of the dura mater here
again the veins are going to be more visible similar to what we had with the posterior
you will have multiple veins the blue this dark blue will be the veins and then you can see a
little bit of an artery right here associated with the this would be the anterior spinal arteries
all right excellent so that is going to wrap us up in terms of what we're identifying for
the back and spinal cord session there's a lot of fun nervous tissue structures to locate and
i hope that gives some context and some ideas of those structures that we talked about conceptually
thank you for your time and attention throughout these and i hope you have a great rest of your day