Logan Steele
Retraction is a term used in various fields, including medicine, obstetrics, dentistry, and anatomy, to describe the act of drawing back or returning to an original position. In medicine, retraction refers to the inward movement of the neck and rib area during inhalation in people with breathing difficulties, such as asthma. In obstetrics, retraction describes the state of uterine muscle fibres remaining shortened after contracting during labour, guiding the fetus downward through the pelvis. In dentistry, retraction involves using orthodontic appliances to reposition teeth. In anatomy, retraction is the opposite of protraction, where certain body parts, like the scapula or mandible, are returned to their original positions after being protruded or stuck out.
Characteristics of Muscle Retraction
| Characteristics | Values |
|---|---|
| Obstetrics | Uterine muscle fibres remaining shortened after contracting during labour |
| The basal portion of the uterus becomes thicker and pulls up the dilating cervix over the presenting part | |
| Dentistry | Drawing back of one or more teeth into a better position by an orthodontic appliance |
| Anatomy | The opposite of protraction movement, which refers to bringing the protracted scapula or mandible back into their original positions |
| Moving the scapula bone backward | |
| Medical | When the area between the ribs and in the neck sinks in when a person with asthma attempts to inhale |
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What You'll Learn
Shoulder retraction
Scapular retraction, also known as shoulder retraction, is a type of exercise that involves pulling the shoulder blades together toward the spine. This movement helps to improve the integrity and strength of the muscles around the shoulder blades, enhancing upper-body strength and flexibility. It also aids in improving posture and stabilising the shoulder joints, thereby reducing the likelihood of shoulder injuries.
To perform a scapular retraction, one must first stand or sit tall with their arms at their sides. Then, they must pull their shoulder blades down and together toward their spine while keeping their chest open and lifted. It is important to keep the shoulders relaxed and down during this exercise, and to refrain from rounding the upper back or overextending the neck. As strength improves, resistance can be added by incorporating light weights or resistance bands.
The muscles targeted by scapular retraction include the rhomboids, middle trapezius, and lower trapezius. Additionally, the upper trapezius and latissimus dorsi are also engaged during this exercise. By strengthening these muscles, scapular retraction can help to alleviate discomfort associated with incorrect posture and improve overall body alignment.
Scapular retraction exercises are particularly beneficial for individuals looking to improve their shoulder health and range of motion. They can also be used as a warm-up before more rigorous exercises, helping to strengthen the middle and upper back muscles. Overall, scapular retraction is an important exercise for enhancing shoulder stability, posture, and upper-body strength.
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Retraction in asthma patients
Retraction, in the context of muscle movements, refers to the action of drawing something back or the state of being drawn back. In the case of asthma patients, retraction specifically refers to respiratory or chest retraction, which is a sign of respiratory distress.
During a severe asthma episode, the airways may narrow and become inflamed, leading to difficulty in breathing. This difficulty in breathing can result in chest or respiratory retraction, where the skin and soft tissue in the chest wall, including the area between the ribs and the neck, sink in when inhaling. This occurs because the intercostal muscles between the ribs have to work harder to pull air into the lungs, indicating a serious difficulty in breathing.
Chest retractions can occur in people of all ages, but they are easier to spot in babies and small children due to their softer and less developed chests. In adults, chest retractions are typically caused by a blockage in the windpipe or large and small airways of the lungs, which can be a life-threatening emergency.
Asthma patients may experience chest retractions during severe asthma episodes, which are characterised by symptoms such as coughing, wheezing, shortness of breath, rapid breathing, and chest tightness. It is important for asthma patients to manage their condition effectively by avoiding triggers, taking medications, and seeking urgent medical care during asthma emergencies.
If chest retractions occur, it is crucial to seek immediate medical attention. Emergency treatment may include oxygen therapy and medications to reduce swelling. Once the immediate threat has passed, a doctor will focus on diagnosing and treating the underlying condition, such as asthma, to prevent further episodes of chest retraction.
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Retraction in obstetrics
In general, retraction is a medical term used to describe the action of muscles when a person is having trouble breathing. For example, when a person with asthma attempts to inhale, the area between the ribs and the neck sinks in as extra muscles are activated to assist with breathing.
In obstetrics, retraction has a different meaning. It refers specifically to the state of uterine muscle fibres remaining shortened after contracting during labour. This phenomenon results in a gradual progression of the fetus downwards through the pelvis. As the basal portion of the uterus becomes thicker, it pulls up the dilating cervix over the presenting part. This process is crucial in the birthing process as it facilitates the descent of the fetus and prepares the cervix for delivery.
The process of retraction ensures the gradual and controlled descent of the fetus through the birth canal. It is a natural mechanism that assists in the progression of labour and the eventual delivery of the baby. The uterus, with its thickened basal portion, acts as a supportive structure, guiding the fetus into the proper position for birth.
Understanding retraction in obstetrics is essential for healthcare professionals, particularly those specialising in pregnancy and childbirth. By comprehending the physiological changes that occur during labour, such as uterine retraction, medical professionals can better monitor and ensure the safety and well-being of both the mother and fetus throughout the birthing process.
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Retraction in dentistry
Gingival retraction can be caused by various factors, including aggressive tooth brushing with sharp movements or hard bristles, periodontal disease, genetics, and dental malocclusion. Additionally, tobacco use can aggravate the condition and increase the risk of periodontal diseases. Maintaining good oral hygiene is crucial for preventing gingival retraction. Bacterial plaque, if not removed properly through brushing and flossing, can build up and cause inflammation and gum recession over time.
Dentists use a gingival retraction cord during common dental crown and bridge procedures. The cord is gently inserted below the gum line and into the gingival sulcus, the natural space between the tooth and surrounding gum tissue. This process provides a clear view of the tooth and helps create an accurate impression. The retraction cord may cause temporary side effects such as gum swelling and inflammation, particularly in individuals with gingivitis. In some cases, it can also lead to bleeding as the cord rubs against the gum, making impressions challenging.
To address gingival retraction, various methods are available, including mechanical, chemical, chemicomechanical, and surgical techniques. Retraction materials such as Expasyl, Magic Foam Cord, and impregnated retraction cord have been studied for their effects on the gingival sulcular epithelium. While the impregnated retraction cord is commonly used, it requires proper tissue manipulation and is technique-sensitive. Retraction paste, a newly advanced material, has shown better results in histological assessments, respecting the periodontium.
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Protraction movement
Protraction and retraction are essential functions of the shoulder blades that play a role in sports, gym training, and everyday life.
Protraction occurs when the shoulder blades move away from one another, causing the upper back to round and the shoulders to roll forward. This movement is made possible by the forward movement of the clavicle and the acromion at the acromioclavicular joint. The scapula moves away from the midline, which can also be referred to as scapular abduction. This motion usually occurs alongside some scapular lateral rotation.
The muscles that primarily perform scapular protraction are the serratus anterior and pectoralis minor. These muscles also maintain scapular apposition against the thoracic wall. The pectoralis major stabilizes protraction by preventing excessive motion of the sternal end of the clavicle. Additionally, the rhomboid major and minor control the rate and range of scapular protraction.
To perform a protraction movement, stand tall and roll your shoulders forward, allowing your upper back to round. This movement can be further emphasized by performing a scapular push-up: push yourself into the top position and move your shoulders forward as your upper back rounds.
In contrast to protraction, retraction involves the shoulder blades pinching together, the back arching, and the shoulders moving back into a stable position.
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Frequently asked questions
Muscle retraction is the opposite of protraction movement, which refers to bringing the protracted scapula or mandible back to their original positions.
Protraction means protruding or sticking out a body part. For example, when throwing a punch with abducted arms, the serratus anterior muscle contracts and drags the scapula forward over the rib cage, causing protraction of the scapula.
An example of muscle retraction is shoulder retraction, which involves moving the scapula bone backward.
In obstetrics, uterine muscle fibre retraction refers to the state of the fibres remaining shortened after contracting during labour, resulting in the gradual progression of the fetus through the pelvis.
Yes, the term retraction is also used in dentistry to describe the process of drawing back one or more teeth into a better position using orthodontic appliances.
