Silicon is one of the most useful elements to mankind. Most is used to make alloys including aluminium-silicon and ferro-silicon (iron-silicon). These are used to make dynamo and transformer plates, engine blocks, cylinder heads and machine tools and to deoxidise steel. Silicon is also used to make silicones.
ciliary arteries, short posterior origin, ophthalmic artery; branches, none; distribution, choroid coat of eye. circumflex artery a branch that curves around to the back of the left ventricle in the coronary sulcus, supplying the left ventricle and left atrium. circumflex femoral artery, lateral origin, deep femoral artery; branches, ascending, descending, and transverse branches; distribution, hip joint, thigh muscles. circumflex femoral artery, medial origin, deep femoral artery; branches, deep, superficial, ascending, transverse, and acetabular branches; distribution, hip joint, thigh muscles.
The circumcenter is the point of intersection of the three perpendicular bisectors. A perpendicular bisectors of a triangle is each line drawn perpendicularly from its midpoint. The circumcenter is the center of a triangle's circumcircle (circumscribed circle).