Semilunar

Semilunar refers to anything that is shaped like a half-moon or crescent. In the field of medicine, the term is often used to describe certain anatomical structures. The two most notable examples are the semilunar valves of the heart and the semilunar ganglion of the trigeminal nerve.

Semilunar Valves

The heart has two semilunar valves, the aortic valve and the pulmonary valve. These valves are responsible for controlling the flow of blood out of the heart. They are called semilunar valves because of their half-moon shape.

Aortic Valve

The aortic valve is one of the two semilunar valves of the heart. It is located between the left ventricle and the aorta. The aortic valve opens to allow blood to leave the heart, and closes to prevent blood from flowing back into the heart.

Pulmonary Valve

The pulmonary valve is the other semilunar valve. It is located between the right ventricle and the pulmonary artery. Like the aortic valve, the pulmonary valve opens to allow blood to leave the heart, and closes to prevent blood from flowing back into the heart.

Semilunar Ganglion

The semilunar ganglion, also known as the Gasserian ganglion, is a collection of nerve cell bodies that is part of the trigeminal nerve. It is located in the middle cranial fossa, on the side of the face. The semilunar ganglion contains the cell bodies of the sensory neurons of the trigeminal nerve.

See Also

• Heart
• Aortic valve
• Pulmonary valve
• Trigeminal nerve
• Gasserian ganglion

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