November 29, 2022

You Already Have a 6 Pack?!

Or the fiber orientation of the muscle,   now this is obviously going to be a  six-pack video because we’re gonna  use cadavers to show this muscle. you have to go through to even visualize it   and also two factors that you can  actually control with the six-pack. how this muscle functions and why  everyone has the muscle that

Forms the  now i know — we’re more concerned about seeing it,   and you don’t really consider somebody having  but hey — we’ve all checked that first  box of at least having the muscle. of this muscle that makes  people all excited about it. so you can see we’re looking at an  anterior view of the abdominal wall. now i just want to

Mention why this  thing is called the rectus abdominis. and if you look closely at these fibers or the  fiber orientation of the muscle, the fibers are   going straight up and down, and “rectus” meaning  now the other feature that people love about  this muscle is that it’s segmented into blocks,   and that’s why it gets nicknamed the

Six-pack,  and if you take a look we have these little  intersections here, and these are truly called   and again, most people have  three intersections here. but what that does is creates one, two,   one other thing that’s interesting  is they vary as far as how they  look or how they’re oriented. some can be more straight

Across, but  now those are the typical features that we get all  but how many layers do we have  to go through to see this thing? exposed it on the left but on the right   there was this white connective tissue that we  this white connective tissue is  referred to as the rectus sheath. now, if you’re concerned about the rectus 

Abdominis in the six-pack, you’ve probably   and those are the muscles  on the lateral body wall. again on the cadaver, this is about  where your obliques would end. you can’t see them very clearly because we haven’t  finished the dissection on the lateral side   this is a continuation of the tendon of  and what’s really cool is,

You got  sides — that sheet comes over and covers the  and where it meets in the middle,  band, which is another structural feature  this is that central line that you see  on people with the six-pack muscle. rectus sheath from the right, and the  rectus sheath from the left, which again,   now a little bit of an fyi  in this

Particular cadaver,   linea alba just literally translates to —  and this is actually when it  gets pulled apart too far,   this can happen from a build-up  of body fat underneath. we actually talk a little bit about this in  so a quick checkpoint — yes, all of us  have the muscle that forms the six-pack   and then

We saw the first layer covering  now that is one layer we have to consider about,  but there are still three other  so in order to do that we’re going  so what are these other layers that we have to  now as i mentioned earlier, we came over here  so let’s orient you to this  dissection that we nicknamed   we’ve got the ribs, and

Even continuing down   here we’ve exposed two of the blocks of the  on the left side we’ve got the rectus sheath fully  and even on the right side we’re  of this rectus abdominis, or  again the six-pack muscle. now one quick thing i just have to address here  this is for a frame of reference  the layers we have to go through in 

Order to see the rectus abdominis. that we call the epidermis — obviously  the next layer down is the dermis here,   the majority of that tissue that i’m holding  then we move on to the third layer down which is   now this is made of adipose tissue,  fatty tissue, which is going to come  we have to go to layer 4, which we 

Already have met before, but that’s the   we have to go through four layers  before we can even see this muscle. the epidermis, the dermis, the hypodermis — also  now earlier i mentioned there were two  variables that we had control over. so that means there’s three things that we have no   and let me go a little bit  more into

Detail with that. the epidermis and the dermis — we’re not going to   if we go down to where the hypodermis is, yeah  — we’re going to have some discussion about   but then when we get down to  the rectus abdominis — can we   so let’s start with that hypodermis  and the control we have over that. but it can obviously be

Thinner in really slender  but everybody wants to know how thick or what body   “you can see the six-pack guaranteed at  but this is not how it works because  not everybody pulls fat from the same area  it’s not like you can squeeze everything….  “just take it from my abdominal wall when   based on genetics and even gender 

Now some people might say, “you know…  if you’re working your six-pack muscle,   and there’s just not enough concrete  evidence to make that claim. you’re going to see certain muscles  better and eventually the six-pack. see the six-pack muscle, i can  give you some generalizations. six-packs can shine through a little bit or at 

Least kind of squeak through to see the light   now you’ll be i’m sure shocked to know that  there’s also some variables that influence that,   potentially control with how robust this muscle,   so what i mean by that — if the muscle is a  little bigger, a little more robust, it’s likely   to shine through or be a little

Bit more visible  or easier to see at a little bit more of a higher   body fat percentage than say if the muscle was  so again, because i love to review  things… control what you can control. but going back to how robust the muscle  thing can do and why people choose certain  so why people choose certain  exercises to work the

Rectus   there’s still confusion sometimes on how   and can i choose exercises that maybe target  so to alleviate that confusion, we’re  going to go over some of the details of   and we have geoffrey to help us with  this, as well as my rubber band. now of importance here is this  idea that most skeletal muscles  

If you look at his rib cage here you can  see some blue markings that we’ve put on   these are attachment sites  for the rectus abdominis. for you anatomy geeks, these attachment  now the other attachment is down on  the pubic bone or the pelvis here. now for those who haven’t  taken anatomy before origin   the origin which

Was down here on geoffrey  when we talk about pulling  point a closer to point b. now i want you to think about this, as far as,   now if i pull it on to me in that same  orientation here, from point a to point b,   typically when this rectus abdominis — imagine  i’m on the floor though you guys, with my back   you can

See on my rib cage, this attachment  got pulled closer to the lower attachment   so as the rectus abdominis contracts, it  so if you were to open up an anatomy book  its function, it would — crazy —  say flexion of the lumbar spine. to say like selecting exercises or  workout routines to work this muscle? you every single exercise

That you  could do or these specific routines. we’ll put some cool links in the description  but our purpose is to give you this idea, or  give you some concepts to look for in all of   your ab routines to get this balanced approach  earlier i alluded to this idea of, “can we  although i do think it gets  blown out of proportion

And   almost as if the upper rectus is a completely  clearly from our cadaver dissections  we know that’s not the case. the two examples i want to give you,  the first one is the good  old-fashioned abdominal crunch. and when you contract the six-pack muscle  now, if you compare that to another example  of an exercise, let’s say we

Want to fix   off the ground and kind of roll towards  the pelvis like a reverse crunch. now the benefit comes from challenging  by mobilizing different aspects of the  sites which would help create balance  either one of those exercises will fire  however the movements that tend to mobilize  the rib cage and pull it closer to the

Pelvis   fire a little bit more into the upper rectus,  whereas the movements that mobilize the pelvis   so incorporating both of those  types of movements into your   and the last thing i have to say is  to continually challenge yourself. progressively overload this muscle  and continue to stimulate growth. because if

This muscle gets a little bit bigger  — what we call hypertrophy — it may shine through   and then you can also continue  to work on that shrinking of   you’re frolicking on the beach or doing your  thanks for watching and sticking around to the  end of our rectus abdominis video everyone so   liking, subscribing, and

Leaving comments below,   and until next time have fun working  that wonderful six-pack muscle!

Transcribed from video
You Already Have a 6 Pack?! By Institute of Human Anatomy