Logan Steele
Kissing is an intricate process involving several muscles, nerves, and hormones. The main muscle involved in puckering the lips for a kiss is the orbicularis oris, which runs around the mouth and changes its shape. While the orbicularis oris is key, it is just one of many muscles that come into play during a kiss. For instance, several muscles move the lips and tongue, and the head, neck, and shoulder muscles tilt the head to avoid a collision of noses. The act of kissing also stimulates the facial nerve, which carries messages to the brain, resulting in the release of oxytocin, dopamine, serotonin, and adrenaline, creating a euphoric feeling.
| Characteristics | Values |
|---|---|
| Main muscle involved in kissing | Orbicularis oris |
| Location | Runs around the outside of the mouth |
| Function | Changes the shape of the mouth and puckers the lips |
| Other muscles involved in kissing | Zygomaticus major, zygomaticus minor, levator labii superioris, depressor labii inferioris, depressor anguli oris, lateral pterygoid, genioglossus, styloglossus, palatoglossus, hyoglossus |
| Hormones released during kissing | Oxytocin, dopamine, serotonin, adrenaline, endorphins |
| Other effects of kissing | Increased heart rate, dilation of blood vessels, release of natural endorphins, increased oxygen supply to the body |
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What You'll Learn
The orbicularis oris muscle
This muscle is composed of two parts: a larger peripheral part and a smaller marginal part. The peripheral portion, also known as the extrinsic portion, originates from the modiolus, a dense fibromuscular nodule at the angle of the mouth. It comprises fibres from five buccolabial muscles: the levator anguli oris, depressor anguli oris, buccinator, risorius, and zygomaticus major.
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 where the skin meets the mucous membrane.
The muscle is also involved in playing certain musical instruments, such as brass and some woodwind instruments. Its fibres originate from various sources, including the buccinator muscle and other facial muscles, and attach to the dermis of the upper and lower lips, serving as an attachment site for other facial muscles in the oral region.
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Head, neck and shoulder muscles
The head, neck, and shoulder muscles are essential for various functions, including movement, stability, and support of the head and upper spine. These muscles also enable vital activities such as chewing, swallowing, speaking, and breathing.
The neck, also known as the cervical spine, is a complex structure composed of bones, nerves, muscles, ligaments, and tendons. It is both flexible and strong, allowing for a wide range of head movements. The neck muscles are skeletal muscles, attached to bones by tendons, and they are voluntary, meaning we have control over their movement.
There are more than 20 neck muscles, including anterior (front), posterior (back), and lateral (side) groups. Anterior neck muscles, extending from the jaw to the collarbone, facilitate jaw and mouth movements, head movements, swallowing, speaking, and breathing. Posterior neck muscles, beginning below the skull base, extend down towards the middle of the back, surrounding the shoulder blades. These muscles enable head movements in different directions.
Lateral neck muscles, such as the scalene muscles, control head movements from the base of the skull and allow for twisting and tilting of the cervical spine. The infrahyoid muscles, located below the hyoid bone, move the larynx during speaking and swallowing. The hyoid bone, situated at the front of the neck, is crucial for tongue movement and swallowing.
The head, neck, and shoulder muscles work together to provide stability and facilitate movements necessary for everyday functions, such as eating, communicating, and breathing. These muscles also contribute to more intricate actions, such as kissing, where the orbicularis oris muscle surrounding the mouth plays a pivotal role in puckering the lips.
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Tongue muscles
The human tongue has eight muscles, classified as either intrinsic or extrinsic. The four intrinsic muscles are not attached to any bone and are responsible for altering the tongue's shape. They are the superior longitudinal, inferior longitudinal, transverse, and vertical muscles. These muscles affect the tongue's shape and size, enabling actions such as tongue rolling, and play a role in speech, eating, and swallowing.
The four extrinsic muscles, on the other hand, are anchored to bone and change the tongue's position. They are the genioglossus, hyoglossus, styloglossus, and palatoglossus. These muscles allow for protrusion, retraction, and side-to-side movement of the tongue. The genioglossus, for example, is a thick muscle that contributes to the tongue's shape and enables protrusion and depression of the tongue. The hyoglossus, located in the floor of the oral cavity, is responsible for depressing and retracting the tongue. The styloglossus, a thin, paired muscle, elevates and retracts the tongue.
The tongue's blood supply primarily comes from the lingual artery, a branch of the external carotid artery. The lingual artery passes deep to the hyoglossus muscle and provides branches to various structures in the oral cavity. The deep lingual artery, a branch of the lingual artery, supplies the apex of the tongue. The hypoglossal nerve (CN XII) provides motor innervation to most of the tongue's muscles, except for the palatoglossus muscle, which is innervated by the vagus nerve (CN X).
The tongue plays a crucial role in speech production by manipulating its position against the teeth and palate. It also aids in the oral phase of swallowing by elevating and sweeping posteriorly to propel food past the anterior tonsillar pillar, triggering the swallowing reflex.
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Facial muscles
The human face is capable of an incredible array of expressions, and this is thanks to the various muscles that allow us to emote. One of the most well-known facial muscles is the orbicularis oris, which is responsible for puckering the lips when we kiss. This muscle runs around the outside of the mouth and changes shape based on how we move our mouths.
The orbicularis oris is not the only muscle involved in kissing, however. Several other muscles also play a role, including the zygomaticus major, zygomaticus minor, and levator labii superioris, which pull the upper lip and the corners of the mouth upward. Conversely, the depressor labii inferioris and depressor anguli oris pull the corners of the mouth and lower lip downward, and the lateral pterygoid pulls the mandible down when the mouth opens.
The muscles of the face are some of the only ones that insert into the skin rather than bone. This allows us to create a wide range of facial expressions. For example, while the orbicularis oris is associated with the positive feeling of kissing, its prolonged contraction is often linked to sad or angry expressions.
The act of kissing also involves several muscles in the head, neck, and shoulders, which work to tilt the head and prevent the noses of the kissers from colliding. Additionally, the tongue is moved by the genioglossus, styloglossus, palatoglossus, and hyoglossus muscles.
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Hormones and neurotransmitters
Kissing is a complex behaviour that involves the coordination of various muscles, nerves, and neurotransmitters. While the orbicularis oris muscle is primarily responsible for puckering the lips, several other muscles, such as the genioglossus, styloglossus, palatoglossus, and hyoglossus, come into play when we use our tongues. The act of kissing engages our senses, including smell, which is linked to emotions and plays a role in partner selection.
During a kiss, our brain releases a cocktail of chemicals, including oxytocin, dopamine, and serotonin, which contribute to feelings of euphoria, pleasure, and attachment. Oxytocin, often referred to as the "love hormone," fosters feelings of affection and attachment, similar to those experienced during childbirth and breastfeeding. Dopamine stimulates the brain's pleasure centres, resulting in feelings of euphoria and addictive behaviour. Serotonin influences mood and emotions, contributing to the overall pleasurable experience of kissing.
Additionally, kissing triggers the release of adrenaline, which increases heart rate and is associated with the body's fight-or-flight response. The increase in heart rate, along with dilated blood vessels, leads to improved blood flow and a decrease in blood pressure, offering potential health benefits for the heart. Kissing also reduces cortisol levels, which can enhance feelings of self-worth and relieve stress, thereby reducing headaches and improving overall well-being.
On a reproductive level, kissing may activate neurons that stimulate the release of gonadotropin-releasing hormone (GnRH), which in turn triggers the release of gonadotropin and other hormones from the pituitary gland. This hormonal cascade ultimately leads to the production of sex cells and sex (gonadal) hormones, playing a crucial role in fertility and reproduction.
The act of kissing, therefore, involves a complex interplay of muscles, nerves, hormones, and neurotransmitters, creating a unique and pleasurable experience that has evolutionary advantages and contributes to bonding, attachment, and overall well-being.
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Frequently asked questions
The main muscle involved in kissing is the orbicularis oris, which runs around the outside of your mouth.
The orbicularis oris changes the shape of your mouth when you talk and puckers your lips when you kiss.
Several muscles move your lips and tongue during a kiss, including the Zygomaticus major, Zygomaticus minor, and Levator labii superioris, which pull your upper lip and the corners of your mouth upward.
