Anterior Disection of the orbital cavity
Anterior Dissection of orbital cavity
Moving onto the anatomy side, here is an Anterior dissection of the right eye. Unlike the ears where I started with the smallest bones and worked out. I wanted to start with the eye, from the outside and work inwards. After doing my sketch of my left eye, this seemed the next logical step.
Its a bit of a creepy image as well, which is always a good thing. A bit of a bombardment of new labels to learn, and I was going to write some of them down for you. But, when looking them up I have come across two excellent images relating to the muscles of the eye (obliques and rectus) which I am going to draw next. It also going to tie back to my drawing of the cranial nerves. so watch this space.
The drawing itself, is a bit elongated in my opinion. I think this might be slightly down to how I was copying it , with it being rested on my knee. I also tried a new sketch pad which I got from Rymans. Its called “The artist A4 sketchpad 180gsm” . It might be good for ink, as the paper is quite solid, but I had a real hard time blending on this. You can probably see, not even zooming in, that the blending is quite harsh.
Unlike the cheap boldmere sketching pad, in which I turned its downfalls to my advantage, I cant see this pad being used for much more than doodling. Save your money.
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Categories: Human Anatomy Tags: Anatomy, Anterior, Eye, Muscles, Obliques, Paper, Rectus, Rymans, Skull
Posterior View of the Cranial Nerves
Posterior View Of Cranial Nerves
Moving away from the ear, my next few posts will be about eyes, but I wanted to first give an idea about the space in which all the aforementioned occupy. In my anatomy books,there are several cross section drawings, of things such as the right tympanic cavity, which is where the middle ears sits and I have got to take my hat off to those folks who do medical illustrations, as I do not feel confident in my ability at the moment to attempt to even do a straight copy of one of these illustrations.
What I did go for in the end was this drawing of the cranial nerves, and as you can see its extremley busy, but trust me, it is tame in comparison to the thympanic cavity. The moment you start adding nerves, muscles, bone it starts getting extremely crowded.
To give you more idea on where we are inside the head, I would suggest you take a look at my Pterygopalatine fossa sketch. We are behind this and I hope its clear in my picture here, that you can see where the skull is, and can picture how that continues to curve round to the pterygopalatine fossa, and of course there is the ear on the right.
Now, take a look at the size of the Incus, compared to a american cent and take note on my drawing, where I have marked the Mastoid air cells. Everything I have drawn to date with the ear, takes place just above the this and goes from the outer ear, and just past the Sigmoid sinus. Many diagrams of the middle ear will show the Sigmoid sinus on. Its also interesting to note, if you get an ear infection, those mastoid air cells can get infected, which you really don’t want. I mention this, to indicate how everything around here is connected. I hope this description has given you a better picture.
As for the drawing, usual culprit of pencils but new sketchbook, which has shown, shall we say- somewhat interesting characteristics. The sketchbook is by Boldmere, is a 130gsm and cost the grand sum of 99p. It does seem to have the magic ability to blunt any pencil on contact, which has made defining the lines in the drawing somewhat troublesome. The second interesting property it displays, is as regular readers will know, I take great care to avoid finger grease and keep hand contact to a minimum. Even by doing this, I managed to have a hand that was black along one side.
The paper really doesn’t take the graphite that well,its almost like charcoal in some senses, and most of the time during drawing this, I was afraid I was going to end up with a page of black smudge. Thankfully it was bluetac to the rescue.
I have been pondering whether to do a post on the joys I have been finding in using bluetac, but instead I will head you over to this excellent tutorial on the subject by Mike Sibley
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Categories: Human Anatomy Tags: Anatomy, Bluetac, Boldmere, Cranial Nerves, Head, Mastoid air cells, Mike Sibley, Nerves, Paper, Posterior, Sigmoid Sinus, Skull
Anterolateral View Of The Inner Ear
Anterolateral View of the Inner Ear
To finish off the ear (for now!) Here is the Inner ear. You can break the ear down into two main functional parts. There is the Vesitbule which is dedicated to balance, and the Chochlea which is dedicated to hearing.
If we go back to the middle ear for a second, sound waves there have been converted into mechanical vibrations which have then come to the inner ear where the Cochlea then propagates these signals as waves in fluid and membranes and finally transduces them to nerve impulses which are transmitted to the brain. If you have an engineering type chum, ask them about the challenge of converting sound waves into fluid waves and you will get an idea of the complexity of what is going on and thats even before mentioning nerve pulses.
The Vestibule works in conjunction with your sight is responsible for the senses of balance and motion. It uses fluid and tiny hair cells, to get information about attitude, rotation and linear motion of the head, which it converts into pulses and sends to the brain.
Moving onto the drawing, you can see in the top left hand corner a quick rundown of the pencils I used. I’m not entirely happy with the sketch, mainly I think I need a bit of a better reference on the actual surface.
Of interest, I did take some photos of the drawing as I went along, you can see them in the fotki album here (they will be on the last page) and I have added some notes in the photo descriptions. These pictures are also on my flickr stream which you can find from my previous post.
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Drawing Skeletons – Surfaces
Bone Surface
This is my third observation post about drawing skeletons , this may well be a two part’er as I was reading a very interesting article about the surface of bones, but there is a formatting error in it, which could essentially split the topic. So watch this space!
Bone is continuously growing or being reshaped right up to the point of which we die. A lot of these changes happen on the surface and their is constant deposition and resorption occuring(building up and hollowing out respectively)
There are also blood vesels, nerves, ligaments etc running along side of the bone who leave their marks, in the forms of canals and grooves. Another point as well, is the forces the bone is experiencing will also leave it marks on the surface.
On top of that, evidence of past fractures and breaks will be present along with any signs of malnutrition, scurvy and a host of other things.
The drawing itself was done with what I’m beginning to narrowly whittle down from trial and error; a 6B, 2B, B and a 4H set .
Following on from my comments on my scalp post about paper, I happened to have an A5 220gsm Catridge Pad lying around, and whilst not keen on the size, there is a huge noticeable difference in being able to blend the pencil. I may in my new found appreciation, been a bit over enthusiastic in the tones here, but I think an A4 pad is on the shopping list along with a Mechanical 2B pencil, so I can work finer detail.
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Categories: Human Anatomy, Notes Tags: Bones, Drawing Skeletons, Paper, Skeleton, Surface
