To draw a circle, take a compass with a pencil attached and place the ends on a piece of paper. Then, keeping the end without the pencil stationery, rotate the compass 360 degrees so the pencil draws a perfect circle. If you don't have a compass, you can draw a circle using a piece of string instead. In the 'Sketch' drop down menu, look for 'Sketch Dimension'. Select that, click on your circle to apply a dimension to it, and then click where you want the dimension to be positioned. You should then be able to enter whatever value you want for the diameter.
Circle of Willis is an important arterial communication that supplies the forebrain (telencephalon, diencephalon and optic vesicle) and often frequently tested in the exams. Circle of Willis receives blood from:
- Vertebrobasilar system: Basilar artery which gives off Posterio Cerebral Arteries (PCA) and Posterior communicating arteries which are the branches of PCA
- Internal Carotid Artery System: Gives off other arteries of Circle of Willis
Here, we will learn a mnemonic to draw the circle of willis and intracranial course of Internal Carotid Artery (ICA).
Step-wise instructions for drawing the circle of willis:
1. Draw a Circle – Circle of Willis is a circle of arteries.
Now write the 'Willis' around this circle:
2. Write a large 'W' at the inferior of circle – this represents Posterior Cerebral Arteries (PCA) which arises from a single basilar artery.
Circle Sketch Scg
3. Write a horizontal 'i' at the sides of the circle – this represents Middle Cerebral Artery (MCA) outside the circle and Internal Cerebral Artery (ICA) inside the circle.
4. Write 'l l' at the superior of the circle – this represents the Anterior Cerebral Arteries (ACA) along with the part of circle between the MCA-ICA and Anterior communicating artery.
5. Write a horizontal 'i' at the sides of the circle – this represents Middle Cerebral Artery (MCA) outside the circle and Internal Cerebral Artery (ICA) inside the circle.
Now, the intra-cranial course of Internal Carotid Artery:
6. Write a horizontal 'S' – starting from carotid canal and ending in foramen lacerum.
7. Write another horizontal 'S' beginning from the end of previous 'S' –
Circle Sketch Png
5. Write a horizontal 'i' at the sides of the circle – this represents Middle Cerebral Artery (MCA) outside the circle and Internal Cerebral Artery (ICA) inside the circle.
Now, the intra-cranial course of Internal Carotid Artery:
6. Write a horizontal 'S' – starting from carotid canal and ending in foramen lacerum.
7. Write another horizontal 'S' beginning from the end of previous 'S' –
Circle Sketch Png
Circle Sketch Drawing
- starting from foramen lacerum and then
- forming 'S' shaped carotid siphon within cavernous sinus and then
- ending at the level of anterior clinoid process
- supraclinoid segment of ICA gives of branches to form Circle of Willis
Circle Sketch Embroidery
He is the section editor of Orthopedics in Epomedicine. He searches for and share simpler ways to make complicated medical topics simple. He also loves writing poetry, listening and playing music.
