Color blindness is not a form of blindness at all, but a deficiency in the way you see color. With this vision problem, you have difficulty distinguishing certain colors, such as blue and yellow or red and green.Color blindness (or, more accurately, color vision deficiency) is an inherited condition that affects males more frequently than females.According to Prevent Blindness America, an estimated 8 percent of males and less than 1 percent of females have color vision problems.ed-green color deficiency is the most common form of color blindness. Much more rarely, a person may inherit a trait that reduces the ability to see blue and yellow hues.
5. Ascending aorta, right aortic arch, left aortic arch, connecting to the descending aorta. 6. A vascular ring involves the aorta, its branches and sometimes remnants of vascular structures forming a ring around trachea and esophagus. A vascular sling involves the pulmonary artery.
The cricoid cartilage is the only complete ring of cartilage in the trachea. Below this there are from fifteen to twenty incomplete C-shaped tracheal rings of cartilage that reinforce the front and sides of the trachea to protect and maintain the airway.This leaves a membranous wall at the back, without cartilage.nly in the lungfish, where the lung is connected to the pharynx and the larynx, is it absent. The trachea extends from the larynx and branches into the two primary bronchi. At the top of the trachea the cricoid cartilage attaches it to the larynx.