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Recording my personal observations about the forearm. Note that these are just my personal notes based on things I've observed by looking at multiple pictures from my anatomy book, and I'm not sure they are 100% correct, though they appear to hold true for all the cases I've seen. I'm using my anatomy book as reference for the anatomy. I couldn't find these exact poses of the arm and hand, but found some pictures that were close enough.

The ulna and radius seem to remain fairly stationary as the forearm rotates around the area where they connect to the humerus. The axis of rotation appears to pass through the individual centers of these two bones around these areas, and thus the bones simply rotate in place around the elbow without shifting position. At the wrist, however, the two pivot axises of these bones appear to converge around the center of the wrist, and so the position of the bones change primarily around the wrist where the pivot is no longer centered inside the bones, but outside the bones at the center of the wrist.

7 comments – latest 4:

comd (Apr 9, 2006)

Oh thanks - you all are too nice. :) I'm not sure I got the exact shape of those bones right. I was looking at references but the slight curves of these bones are very complex to me: I think I might have simplified and straightened them too much.

Basically the notes here are regarding the pivot axises of the two forearm bones. When I grab hold of my elbow and rotate my wrist, I can feel that the bones remain stationary around the elbow area because they're rotating in place there. However, they very obviously don't remain stationary at the wrist since they're not rotating in place there, but rather around the center of the wrist. I think it makes sense when drawing these bones to first start drawing around the wrist area, and then extend the bones to connect at the fixed positions around the elbow joint.

mazi (Apr 9, 2006)

close, but the radius is bigger towards the wrist :) you can feel that one sticking out by your thumb (that parts called the "styloid process" which the french kids remember because it sticks out like like the tip of a pen, or "stylo" in french) we got to play with real ones in labs all the time. it was so interesting.

comd (edited Apr 10, 2006)

Ah - I'm pretty sure the proportions are off in other areas as well. :( I think the scapula is a bit small too, and maybe the humerus as well. I wasn't quite sure how the humerus connected to the scapula also, so I also kind of winged it, but mainly I wanted to record how things rotate here in the forearm since I just figured out the basic pivot axises for the two bones today after looking at a bunch of drawings and feeling my own arm as I rotated it. Hopefully that part is semi-accurate.

mazi (Apr 10, 2006)

http://www.jointreplacement.com/bin/images/shoulder/other/shoulderanatomy2.jpg

the head of the humerus is kinda laid in the glenoid cavity (that little concave bit on the side) and laced on with lots of tendons and muscles :)

Space Voyager for Sweetcell

Miss_DJ (Apr 7, 2006)

9 comments – latest 4:

DoOp (Apr 8, 2006)

heyyy, this is pretty sweet lookin' =) wondrous job on it! ^_^

Miss_DJ (Apr 8, 2006)

thank you DoOp!

Sweetcell (Apr 9, 2006)

You finished yaaaaa, excuse me while I speed off in search of lifeforms......

Miss_DJ (Apr 10, 2006)

Sweetcell...i think I'll do another one that's much bigger...and better.

Blargh~

Jodylicious (Apr 9, 2006)

Crap I know, buh.. I havnt drawn anything lately and i'm having block up the creek T_T

1 comment – latest 1:

xiang (Apr 10, 2006)

Cool, but the eyes are a bit too close
looks like Gaara of the sand

YOU!

Expendable-Studios (Feb 9, 2006)

You stole my last beer! YOU. WILL. PAY!
lack of sleep tends to drive you alittle crazy.
[edit] i love how i didn´t need to change anything but the rating.

9 comments – latest 4:

HunterKiller_ (Feb 9, 2006)

Pee in her/his(?) butt!

Expendable-Studios (Apr 10, 2006)
drawn in 14 min

the second time i´ve coloured this, the first time i was foiled by a link.

Hakkai (Apr 10, 2006)

Hilarious! I was just browsing around and looking at this BEFORE you colored it a few minutes ago. <3

Noice!

davincipoppalag (Apr 10, 2006)

Hehehe..don't even take off the hat for that, eh?

This is hidden because it is rated Extreme. Edit your privacy settings to make it visible.

Out of the box

Al0ne_0nmy_0wn (Apr 8, 2006)

Hopefully in another three months thats what my hair will be

2 comments – latest 2:

Ana-hime (edited Apr 9, 2006)

I like this drawing, the hair coloring is very well done, and I love the background. Why would you want hair like that? o.O

Al0ne_0nmy_0wn (Apr 10, 2006)

cause thats what my hair looks like now but it is just jet black and not colorful :]

Greem^^

xxX_Kelee_Xxx (Mar 2, 2006)

I know it sucks but its hard to use the mouse:(

1 comment – latest 1:

22darkangel22 (Apr 10, 2006)

yes,it is hard to use a mouse....look at my mullet picture..it wouldve been better if i only had my tablet here TT_TT

if you lived here you would be home now.

amagic2u (Apr 9, 2006)

from a photo, still having a hard time with the tools but I will keep trying

1 comment – latest 1:

Sweetcell (Apr 9, 2006)

Hey sweeting, lookind good. I left a memo for you I hope it helps with the layers. BFFL.

Harold and The Purple Crayon.

LisaAnne (Apr 9, 2006)

One of my favorite books of all time...2 or 20.

-----
Timer is a tad off...about 20 minutes.
I had forgotten how unique each artist's line quality/style is, until trying to draw Harold from the book. (matching the colors of the aged paper and the ink...haha.)

3 comments – latest 3:

Natsuna (Apr 9, 2006)

:0 I remeber that one ahaha where the things he made were real....I think o__o

DeadlyBlondeArcher (Apr 9, 2006)

Never saw this book, but this made me laugh. This reminded me of when my daughter was a "toddler" she used to color on the walls and the furniture, and then come to me with this really guilty look on her face and say "I "din't codor on de wall, Mommy." :)

fleeting_memory (Apr 9, 2006)

I remember this-good depiction

anatomy study - skull

comd (Apr 9, 2006)

Practicing skulls at various angles and trying to figure out how the muscles and skin wrap around them.

3 comments – latest 3:

xiang (Apr 9, 2006)

DX gawd, how do you draw so well? Which school do you go to?
P.S.: I saw a picture of your dog, Stinky. My dog looks exactly like him. :O

comd (edited Apr 9, 2006)

Thanks - I just copied the skull here though almost directly from my book at roughly the same angle. The main purpose of the exercise was to try to figure out how outer surface of the face forms around the skull (the red lines). I don't think I quite got that part right, as it looks kind of off to me.

As for my school, I'm out of school now. I was a computer science major, so I didn't get much in the way of art classes. The extent of my formal schooling comes mostly from my high school art class and a graphics design class I took in college that was geared towards business majors. Most of my learning comes from books. My favorite authors are Hogarth, Loomis, and Bridgman. Hogarth's books just make me feel like I know absolutely nothing about anatomy. Loomis is probably the most helpful, and I like how Bridgman simplifies the human form into very mechanical-looking parts. I also have this one from Barcsay which I've been looking at a lot lately which is probably the most helpful one when it comes to understanding the forms of individual bones and muscles.

I ultimately want to get comfortable drawing figures without references which is something I'm horrible at right now. I think it's because of the way I've used references traditionally in the past. I treated the process more as a hand-eye coordination exercise when copying what I saw rather than trying to learn the essential 3d forms through the experience. I'm trying to change that now.

Is your dog a Chihuahua as well? I love them - I have another one named Beauty (the black one).

LisaAnne (Apr 9, 2006)

Extremely well done.

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