Dominic Stone
Kissing is a complex activity that involves the use of many muscles in the human body. The main skeletal muscle involved in kissing is the orbicularis oris muscle, which is responsible for puckering the lips. This muscle is a complex, multi-layered structure that surrounds the mouth and consists of four independent quadrants that interlace. It is not a simple sphincter muscle and has a variety of functions, including closing the mouth and puckering the lips when it contracts. The orbicularis oris muscle is also used by musicians when playing brass or woodwind instruments. Kissing has been shown to have health benefits, such as boosting oxytocin, dopamine, and serotonin levels, increasing self-esteem, and reducing stress levels.
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What You'll Learn
The orbicularis oris muscle
The orbicularis oris is a composite muscle, consisting of two parts: a larger peripheral part and a smaller marginal part. The peripheral portion, also called the extrinsic portion, originates from the modiolus, arising from the fibres of five of the many buccolabial muscles that attach to it. These modiolar muscles include the levator anguli oris, depressor anguli oris, buccinator, risorius, and zygomaticus major muscles. The uppermost and lowermost fibres of the peripheral portion pass into the superior and inferior labial areas, respectively, while the middle fibres decussate, allowing the upper half to pass into the inferior labial area and the lower half to pass into the superior labial area.
The marginal portion, or intrinsic portion, consists of a single or double band of muscle fibres that stem from the modiolus toward the midline, passing through the connective tissue of the lips. These fibres curl upon themselves, forming the vermilion border of the lips at the junction between the skin and mucous membrane of the lips. Upon passing the medial plane, these fibres interlace with the contralateral fibres, similar to the peripheral portion of the muscle.
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The science of kissing
Kissing is a complex act that involves the coordination of various muscles and the exchange of biological material, carrying both benefits and risks. The scientific study of kissing is called "philematology", derived from the ancient Greek word "philos", meaning earthly love.
The Muscles Involved
The act of kissing involves the engagement of numerous facial muscles. The main skeletal muscle involved is the orbicularis oris, a complex, multi-layered muscle encircling the mouth. It is composed of four independent quadrants that interlace, giving the appearance of circularity. This muscle is responsible for closing the mouth and puckering the lips when it contracts.
Other muscles that play a role in kissing include the zygomaticus major, zygomaticus minor, levator labii superioris, depressor labii inferioris, depressor anguli oris, lateral pterygoid, masseter, temporalis, medial pterygoid, genioglossus, styloglossus, palatoglossus, and hyoglossus. These muscles work together to move the lips, jaw, and tongue during a kiss.
The Benefits of Kissing
Kissing has been associated with several potential health benefits. It is believed to boost oxytocin, dopamine, and serotonin levels, often referred to as "happy hormones". Kissing can also increase self-esteem, enhance bonding with others, and reduce stress levels. Additionally, the act of kissing is thought to provide a metabolic boost by burning calories and may even help prevent facial wrinkles by promoting muscle contraction and relaxation.
Biological Exchange
During a kiss, there is an exchange of biological fluids and microorganisms between the participants. On average, couples exchange 9 mL of water, 0.7 mg of protein, 0.18 mg of organic compounds, 0.71 mg of fats, and 0.45 mg of sodium chloride per kiss. Additionally, an active kiss can transmit up to 1 billion bacteria representing 278 different species, with most of these organisms being non-pathogenic.
Pathogen Transmission
While kissing can have positive effects, it is important to be aware of the potential risks associated with the exchange of biological material. Kissing can transmit pathogenic organisms, including upper respiratory infective viruses, herpes simplex, Epstein-Barr viruses, pathogenic streptococci, syphilitic spirochetes, and Mycobacterium tuberculosis bacteria. Although rare, there have been reported cases of human immunodeficiency virus (HIV) transmission through kissing, typically involving gum disease in one or both individuals.
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The health benefits of kissing
Kissing stimulates the orbicularis oris muscle—a complex of muscles in the lips that encircles the mouth. But that's not the only muscle involved in a kiss. The zygomaticus major, zygomaticus minor, and levator labii superioris pull your upper lip and the corners of your mouth upward, while the depressor labii inferioris and depressor anguli oris pull the corners of your mouth and your lower lip downward.
The act of kissing also involves the stimulation of over 10,000 nerve endings, which help produce an assortment of happiness hormones. Kissing triggers the brain to release a cocktail of chemicals, including oxytocin, dopamine, and serotonin, which encourage feelings of euphoria, affection, and bonding. Kissing also increases testosterone levels, which is especially important for growth, cell repair, and increased libido.
Kissing has many health benefits. Firstly, it reduces the body's cortisol levels, which are often higher in people who are unhappy with their physical appearance. Lowering cortisol levels helps to reduce stress and improve feelings of self-worth. Kissing also increases your heart rate and dilates your blood vessels, which increases blood flow and causes an immediate decrease in blood pressure. This can help relieve cramps and headaches, as well as prevent headaches by lowering stress, a known trigger for headaches.
In addition to these benefits, kissing can boost your immunity by exposing you to new germs that strengthen your immune system. So, the next time you're feeling unwell or stressed, consider giving someone a kiss—it might just be what you need to feel better!
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The muscles involved in kissing
Kissing involves a variety of facial muscles, with the orbicularis oris being the main skeletal muscle involved. The orbicularis oris is a complex, multi-layered muscle that encircles the mouth and is located above the upper lip and below the bottom lip. It is composed of four independent quadrants that interlace and give the appearance of circularity. This muscle is responsible for closing the mouth and puckering the lips when it contracts.
The orbicularis oris is also involved in playing brass and woodwind instruments, and it can be exercised by puckering the lips with force and holding for ten seconds, repeating this exercise ten times. Other muscles that are involved in kissing include the zygomaticus major, zygomaticus minor, and levator labii superioris, which pull the upper lip and the corners of the mouth upward. The depressor labii inferioris and depressor anguli oris, on the other hand, pull the corners of the mouth and the lower lip downward.
When the mouth is opened during a kiss, the lateral pterygoid pulls the jawbone down, while the masseter, temporalis, and medial pterygoid close the mouth. The genioglossus, styloglossus, palatoglossus, and hyoglossus are responsible for moving the tongue. In addition to these muscles, kissing also involves the facial nerve, which carries impulses between the brain and the muscles, skin, and tongue in the face.
The act of kissing can burn between 5 and 26 calories per minute, and it has been suggested that it may help prevent facial wrinkles due to the exercise involved. Kissing also has positive effects on the body, including increased levels of oxytocin, dopamine, serotonin, and endorphins, as well as decreased stress levels and increased self-esteem.
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The history of kissing
Kissing, an act of pressing one's lips against another person, animal, or object, is a ritual, formal, symbolic, or social gesture. It is a way to convey affection, express love, passion, romance, sexual attraction, or greeting. While it is a common practice in many cultures, it is not universal, and some cultures have no place for it. The history of kissing is a fascinating topic that has been studied by anthropologists and scholars, who have traced its origins back to ancient civilizations.
The earliest known references to kissing-like behaviour are found in the Vedas, a group of Indian scriptural texts that date back to around 3,500 years ago. One of these volumes, the Rig Veda, describes people touching their lips together. However, recent studies have challenged the belief that kissing originated in India around 1500 BCE, as evidence of kissing has been found in ancient Mesopotamia and Egypt from at least 2500 BCE. Thousands of clay tablets from Mesopotamia mention kissing, providing insights into romantic intimacy in the ancient world.
In ancient texts, there are indications that societies attempted to regulate kissing. For example, it was considered inappropriate to kiss a partner in public, and kissing was likely preferred among married couples. Kissing is also mentioned in the Old Testament, where Jacob steals his brother Esau's blessing by kissing their blind father Isaac. In Homer, which dates back to the 9th century BCE, King Priam of Troy kisses Achilles' hand to plead for the return of his son's body.
Under the Romans, kissing became more widespread. They distinguished between different types of kisses, such as a kiss on the hand or cheek (osculum), a kiss on the lips (basium), and a deep or passionate kiss (savolium). Roman poets like Ovid and Catullus celebrated kissing in their works. During the rise of Christianity, early Christians greeted each other with a "holy kiss," which was believed to lead to a transfer of the spirit.
The culture of kissing is believed to have spread from the Eastern World, specifically India. However, it is important to note that not all cultures kiss, and even within kissing cultures, there are variations in the types of kisses and their meanings. For example, in the Trobriand Islands off the coast of Papua New Guinea, lovers kiss by sitting face to face and nibbling at each other's eyelashes.
While the exact origins of kissing may be difficult to pinpoint, it is clear that it has been a part of human behaviour for thousands of years, with references appearing in ancient texts and artefacts. Kissing continues to be a significant expression of affection and intimacy in many cultures worldwide.
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Frequently asked questions
The kissing muscle, or the orbicularis oris, is a complex of muscles in the lips that encircles the mouth. It is also known as the musculus orbicularis oris.
The orbicularis oris muscle is responsible for closing the mouth and puckering the lips when it contracts. It is also used when playing brass or woodwind instruments.
Puckering the orbicularis oris muscle is a form of functional exercise that can boost your metabolic rate, increase oxytocin, dopamine, and serotonin levels, boost self-esteem, help you bond with others, and reduce stress levels.
The orbicularis oris muscle is a complex, multi-layered muscle that attaches to the dermis of the upper and lower lips. It is composed of four independent quadrants that interlace and give the appearance of circularity.
