Anatomy Critiques – The Rib Cage
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Anatomy of the Human Body

Torso(163 Lessons )

Anatomy Critiques – The Rib Cage

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Anatomy Critiques – The Rib Cage

248K
Mark as Completed
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@aeyt
2mo
Another more structured attempt at rib cage construction! Again from memory. Got a bit carried away with cleaning this one up. Looking up at the rib cage continues to be the most difficult pow and the side planes’ shape remains a bit unclear. Thank you for taking the time to read this and looking at my work! If you see any fatal flaw with the way I construct the rib cage I’d love to know. Now it is time to move on to the shoulders.
Rachel Dawn Owens
@aeyt
2mo
I really liked Neville’s exercise idea and had a go at it too! I did end up losing focus and direction on the exercise so I did kinda just end up doing some memory and construction practice of the rib cage.
@aeyt
2mo
Second attempt on pose #2!
@aeyt
2mo
Second attempt on pose 1 as well!
@hugpillows
First time posting, would love some critique, thank you in advance.
Dwight
2yr
The only thing I see is the lumbar section's length (too long); remember that you can pinch the muscle between the iliac crest and the bottom of the ribs.
Ram OFT
2yr
Hey @Stan Prokopenko I'm currently going through the course, and I wanted to see if you've ever drawn out the complete answers for this HW assignment? I'm getting a lot of different answers for some of the same poses, and I wanted to see how close are my poses to the actual photos.
Jesper Axelsson
Hi @Ram OFT, maybe this is what you're looking for? Rib Cage Assignment Examples - Side View
Dwight
3yr
Here's the rest of my ribcages!
@angiespice
are there any examples of the finished exercises ? It certainly would help to reference !
Romain Decotte
Hi! This is my first time posting. I am focusing on the rib cage at the moment. In the attached pic, I reused the drawings done for the spine assignment with the buckets and attempted to correct all of the rib cages now that I have reached the end of the rib cage lessons. Getting this far in the course made me realise that the sacrums are off in most of them, but did I get the rib cages right? Thank you in anticipation for your critique(s). Cheers, Romain
Jesper Axelsson
Hi @Romain Decotte, these are very good! I'll try to look for things to improve on: - In some of these the sternum is a little long. - I think the top cap of the ribcage (the first rib) should be a little wider and at a less steep angle. - Maybe you forgot to think about this since the focus was on the ribcage, but the ellipse crosscontours on some of the spines seem to be at the wrong angle (marked with x's in my paintover). I struggled with drawing the spine, but it became a lot easier once I had a pelvis and ribcage to relate it too. I like to think of the thoracic portion as being tucked into the back of the ribcage; they share the same arc. It starts slightly below the 12th ribs' attachments and ends at the level of the 1st rib, with the same angle as the top cap of the ribcage. The angle of the ellipses remains perpendicular to the current direction of the spine. If I'm unsure whether I'm looking up or down at a vertebrae it helps me to imagine touching it; imagine laying my palm against it's ends. An exercise that you could try to get more comfortable with ellipse crosscontours is to start by drawing a random curve, then add ellipses to it, making sure that the ellipses are always perpendicular to the curve's current direction. Play with different sizes and degrees of openness, to show the orientation in space. Hope this helps :)
Sita Rabeling
After more practice in the figure drawing fundamentals, here another try. I used the Skelly app to have some clues how to place ribcage, pelvis and spine.
Rick B
3yr
After working through the samples. Decided to add a little extra and get the previous lessons in there too. Been working at it little by little for the past few weeks.
@angiespice
wow great work !
CHARLES DEIGHAN
After watching Stan's critique on the rib cage. I thought I'd try again, here's another two attempts at it.
Bryan Del Rio
I really appreciate some criticism before continuing my second set of practice I'm sure there's much to improve on
Jesper Axelsson
Hi @Bryan Del Rio, I think you've done a good job! Good structure! I'll do my best to help you further: - 2nd image, bottom right, I think the thoracic arch is a little small - 2nd image, top right, I think the perspective convergence is off. If we were looking at the ribcage from the left, the lines would converge the way they do in your drawing, but since we're looking at it nearly straight from the front they should be more parallell - I personally like to indicate the thoracic part of the spine as well, when studying the ribcage. It's a c-curve tucked into the back of the ribcage. - You seem to make the distance between the ribcage and pelvis too long. Indicating the spine can help with that. Another thing that helped me keep the distance in check was to practice the robo bean with a connection of decided length, between the two boxes, as seen in the lesson video at 04:57 https://www.proko.com/course-lesson/how-to-draw-structure-in-the-body-robo-bean/notes To get a feel for the distance you can try drawing a couple of robo beans from imagination with the connection included I hope this helps :)
Matthew Kioki
This one took me a while. I don't think I'll do each assignment three times from here on out. I think it would be better if I run through the course a few times. I was having difficulty understanding what I'm seeing on the model. If I have a descent understanding of everything the second time I repeat this course I think that will help more than trying to master each part before moving onto the next one. Open to critiques.
Jesper Axelsson
Hi @Matthew Kioki, these are really good! A few notes: - I think the ribcage is a little large sometimes, or the pelvis too small - I would spend a little time looking at the 3D-model and practice drawing the ribcage from imagination. Look especially for getting the angle of the first rib right (slanted downward slightly) and the attachment of the twelth ribs (roughly halfway between the bottom of the ribgace and the bottom of the sternum.), since that will help you when drawing the obliques and lower back muslces When moving to a new section in the course I like to start with acquanting myself with 3D-model, learning how to draw it from imagination. "If I have a descent understanding of everything the second time I repeat this course I think that will help more than trying to master each part before moving onto the next one" I agree! I made the mistake of being overly thorough with the course, trying to MASTER each step (I spent 1&1/2 to 2 months on each part of the Torso course, 1h practice each day). Last year I switched to spending a week on each course part (two when it was a bones lesson) and completed the course before summer. I hope this was helpful :) Keep up the good work!
Văn Hiếu Võ
It was quite troublesome, but I hope I'm getting close to figuring out how to get the ribcage right.
Jesper Axelsson
Hi @Văn Hiếu Võ, nice studies! They are well constructed! And the sacrum is looking much better now too :) -I don´t know what the reference looked like, but in many of these the ribcage as well as the distance from the 10th rib corner to the asis, seem a little long, - I believe the curve on the back should be a little more severe. The thoracic portion of the spine looks a little straight to me I hope this was helpful :)
@ehioe
3yr
@ehioe
3yr
My ribcage assignment
@ehioe
3yr
Ribcage assignment exploration
Văn Hiếu Võ
I'm not trying to blame the 3D models, but I think part of the reason why that person was confused about the size along different rotations is because Sketchfab model viewer is kind of crappy. I've recently found out that the rotation pivot shifts depending on your zoom level, and there's this weird restriction that blocks you from rotating the model all around. The only model that I have no problem with is the one hosted on p3d.in (particularly, this one https://www.proko.com/course-lesson/3d-model-wireframe-bucket-with-pelvis/notes) I think you should just host all your models on this website, because it has this super-useful X-ray mode, and of course, wireframe mode, both of which allows you to see through the model and figure out what's going on behind all the forms. Sketchfab's model viewer is infuriatingly limited in this regard.
Jesper Axelsson
Yeah, I agree. I´m not a pro when it comes to what website to use, but being able to rotate freely is really helpful
Kenny Tafoya
Hi first time posting, I didn't know exactly where to put these but I started them back in Proko.com 1.0. I decided it would be best for me to do "skelly" versions of the rib cage and summary assignments, as I was having a bit of trouble with it all and this way I could take my time on each piece. I will say I didn't know how to draw out a loomis head until example 5 where I went over to that lesson I just figured it out. I bought a bundle of courses and figured anatomy was the one start with. I would really appreciate feedback on the spine and ribcage because I feel like I'm always too stiff, narrow, wide or long with both. I drew these in photoshop, and did use a ruler tool for some of it. Other than that, just the brush tool. Thanks in advance!
@kugeltisch
Maybe it is a little bit late to answer but the main issues I see are perspective problems. I think you copied the contours, especially on the pelvis. I would suggest drawing simple forms first and then try to fit them inside. (box for the ribcage, cylinder for the pelvis). But I think you made the right decision to draw skelly first. Also, I really like the sketchy feel at first I thought it was drawn on real paper. :D
Ash Chung
4yr
Am I posting in the the right section? Hi @Liandro Roger , here's my latest redo of the rib, last comment of #3 was that if the figure is arching its back, the lumbar part is less of an inward curve. For #7, the thoracic portion was bit too "S-curvy", should follow the same curvature as the back plane of ribcage. Hope I got it right?
Liandro
4yr
Hey, Ash, yes, I guess you are on the right section for this :) And yay, I think you got it alright! In number 3, I prefer your first version of the ribcage, but the issue on the Lumbar section is surely solved on the re-do! In number 7, the connection between the Lumbar and the Pelvis feels better on the first version, too. The "s-curve" issue is just a matter of opening up the arch of the thoracic portion a bit more - take a look at this image to see what I mean. Notice how the Thoracic portion, taken isolated (red lines), is a C-curve, but when we combine it either with the lumbar or the Cervical (blue), then there is an S-curve. Hope this helps! Keep it up.
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Founder of Proko, artist and teacher of drawing, painting, and anatomy. I try to make my lessons fun and ultra packed with information.
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