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The intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They are divided into three groups: external intercostals, internal intercostals, and innermost intercostals. All three groups of muscles support the rib cage and are accessory respiratory muscles, aiding in the process of breathing. For bodybuilders, training these muscles can help improve respiratory performance, allowing for better physical activity and endurance.
| Characteristics | Values |
|---|---|
| Definition | Intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces. |
| Function | They support the rib cage and are accessory respiratory muscles that participate in the process of forced breathing. |
| Types | External intercostals, internal intercostals, and innermost intercostals. |
| External Intercostals | Aid forced inspiration and originate from the inferior border of one rib, inserting to the superior border of the rib below. |
| Internal Intercostals | Aid forced expiration by depressing the ribs, thus reducing the thoracic cavity size. They are the middle layer of the intercostal musculature. |
| Innermost Intercostals | The deepest intercostal muscles, separated from internal intercostals by a neurovascular bundle. |
| Training | Training the intercostal muscles can improve breathing efficiency and athletic performance. "Resisted breathing" exercises using devices like Airofit or PowerLung can help strengthen these muscles. |
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What You'll Learn
- Intercostal muscles are accessory respiratory muscles that aid breathing
- External intercostals facilitate forced inspiration, while internal intercostals aid forced expiration
- Intercostal muscles are innervated by intercostal nerves
- Intercostal muscles are located between the ribs
- Training intercostal muscles can help athletes breathe easier
Intercostal muscles are accessory respiratory muscles that aid breathing
The intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They are divided into three groups, from superficial to deep: external intercostals, internal intercostals, and innermost intercostals. All three groups of muscles support the rib cage and are accessory respiratory muscles that aid breathing.
The external intercostals are the most superficial intercostal muscles. They facilitate forced inspiration by elevating the ribs and bending them open, thereby expanding the transverse dimensions of the thoracic cavity. The internal intercostals form the middle layer of the intercostal musculature. They originate from the costal groove of one rib and insert into the superior border of the rib below. These muscles depress the ribs during forced expiration, reducing the thoracic cavity's size. The innermost intercostals are the deepest intercostal muscles, separated from the internal intercostals by a neurovascular bundle.
The intercostal muscles work together to aid breathing by expanding and contracting the chest cavity. Honing these muscles can help athletes breathe more efficiently, improving their physical performance. This can be achieved through "resisted breathing" exercises, which use handheld devices to increase breathing resistance, thereby strengthening the respiratory muscles.
Intercostal muscles are constantly working, and their importance is often overlooked until an injury occurs, such as an intercostal strain, which can cause discomfort with every breath.
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External intercostals facilitate forced inspiration, while internal intercostals aid forced expiration
The intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They are accessory respiratory muscles that participate in the process of forced breathing.
The external intercostal muscles, also known as intercostalis externus, facilitate forced inspiration. They originate on ribs 1–11 and have their insertion on ribs 2–12. The muscle fibres run downward and forward, from the tubercles of the rib above to the costal cartilage of the rib below. The external intercostals are responsible for the elevation of the ribs and bending them more open, thus expanding the transverse dimensions of the thoracic cavity.
The internal intercostal muscles, or intercostalis internus, aid in forced expiration. They originate on ribs 2–12 and have their insertions on ribs 1–11. Their fibres pass anterior and superior from the upper margin of the rib and costal cartilage to the low. The internal intercostals are responsible for depressing the ribs and bending them inward, thus decreasing the transverse dimensions of the thoracic cavity.
The innermost intercostal muscle, or intercostalis intimus, is a deep layer of the internal intercostal muscles, separated from them by a neurovascular bundle. The fibres of the innermost intercostal muscles run in the same direction as those of the internal intercostals, that is, downward and backward.
Training the intercostal muscles can help athletes breathe easier and improve their performance. This can be done through "resisted breathing" exercises, using handheld devices such as the Airofit or PowerLung.
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Intercostal muscles are innervated by intercostal nerves
Intercostal muscles occupy the 11 intercostal spaces in the rib cage. They are divided into three groups: external, internal, and innermost intercostal muscles. The external intercostals are the most superficial muscles, originating from the inferior border of one rib and inserting into the superior border of the rib below. They are responsible for elevating the ribs during forced inspiration. The internal intercostals form the middle layer of the intercostal musculature. They originate from the costal groove of one rib and insert into the superior border of the rib below, aiding in forced expiration by depressing the ribs. The innermost intercostals are the deepest intercostal muscles, originating from the costal groove of one rib and inserting into the superior border of the rib below, assisting in forced expiration.
The intercostal muscles are innervated by the intercostal nerves, which are the anterior rami of the thoracic spinal nerves from T1 to T11. These nerves travel in the intercostal spaces and provide sensory information from the skin and parietal pleura. The first six intercostal nerves innervate the nearby intercostal muscles and cutaneous territory, ending as anterior cutaneous branches to innervate the skin near the chest midline. The lower intercostal nerves exit the intercostal spaces to innervate the anterior abdominal wall, muscles such as the rectus abdominis, and the overlying skin. They also send posterior branches to the paraspinal muscles and communicant rami to the sympathetic trunk.
The external intercostal muscles are innervated by the anterior rami of spinal nerves T1-T11, which are the intercostal nerves of the corresponding intercostal space. Similarly, the internal intercostal muscles are innervated by the intercostal nerves of their respective intercostal spaces. The innermost intercostal muscles follow a similar pattern, receiving innervation from the intercostal nerves of the respective intercostal space (T1-T11). This innervation allows for the coordination of muscle contractions and the proper functioning of the intercostal muscles during respiration.
Intercostal nerve damage can occur during thoracotomy procedures or chest tube placements. Lesions to a single intercostal nerve, such as those caused by trauma or surgical procedures, can result in "strip-like" paresthesia. The proper understanding of intercostal nerve anatomy is crucial for healthcare providers to accurately diagnose and treat intercostal nerve pain and pathology.
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Intercostal muscles are located between the ribs
The intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They are divided into three groups, from superficial to deep: the external intercostals, internal intercostals, and innermost intercostals. All three groups of muscles support the rib cage and are involved in the mechanical aspect of breathing by participating in the process of forced breathing.
The external intercostal muscles, also known as intercostalis externus, aid in quiet and forced inhalation. They originate on ribs 1–11 and have their insertion on ribs 2–12. The muscle fibres run downward and forward, from the tubercles of the rib above to the costal cartilage of the rib below. The external intercostals are responsible for elevating and bending the ribs open, thus expanding the transverse dimensions of the thoracic cavity.
The internal intercostal muscles, or intercostalis internus, aid in forced expiration, while quiet expiration is a passive process. They originate on ribs 2–12 and have their insertions on ribs 1–11. Their fibres run downward and backward, from the sternocostal junction of the rib above to near the tubercle of the rib below. The internal intercostals are responsible for depressing the ribs and bending them inward, thereby decreasing the transverse dimensions of the thoracic cavity.
The innermost intercostal muscles, or intercostalis intimus, are the deepest intercostal muscles, forming a deep layer of the internal intercostals. Their fibres are directed downward, forward, and laterally, similar to the internal intercostal muscles.
Training the intercostal muscles can help athletes and bodybuilders breathe more efficiently during physical activity. This can be achieved through "resisted breathing" exercises, using handheld devices such as the Airofit or PowerLung, which make breathing more challenging to strengthen the breathing muscles.
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Training intercostal muscles can help athletes breathe easier
The intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They are accessory respiratory muscles that participate in the process of forced breathing. The external intercostals facilitate forced inspiration, while the internal and innermost intercostals aid forced expiration.
Training these muscles can help athletes breathe more efficiently and powerfully, improving their overall performance. A study found that runners who underwent four weeks of inspiratory muscle training ran 12% farther, and this number increased to 15% when they performed a targeted warm-up before exercise.
Deep breathing exercises, also known as pranayama in yoga, can help tone the intercostal muscles. One such exercise involves sitting on the floor with two yoga blocks placed behind you – one flat and the other at a medium height. You then lay your shoulder blades on the flat block and your head on the other, with your arms relaxed and palms facing upwards, and your legs stretched out in front of you. Next, inhale deeply and allow your chest to rise, and on the exhale, let your stomach, diaphragm, lungs, and chest fall in that order. This exercise can be repeated nine times with regular breaths in between.
Another breathing exercise involves inhaling deeply and stretching your arms to the right on the exhale, stretching your left intercostal muscles. You then inhale again and return to the centre, and on the next exhale, stretch your arms to the left, feeling your right intercostal muscles being stretched. This can be repeated two more times on each side.
Additionally, diaphragmatic breathing can help improve muscle function during exercises, increase oxygen in the blood, and make it easier for the body to release gas waste from the lungs. This technique involves tightening your stomach muscles and exhaling through pursed lips, keeping the hand on your upper chest as still as possible.
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Frequently asked questions
Intercostal muscles are a group of intrinsic rib cage muscles that occupy the 11 intercostal spaces between the ribs. They help form and move the chest wall and are involved in the mechanical aspect of breathing by helping to expand and contract the chest cavity.
Training the intercostal muscles can help bodybuilders breathe more efficiently, which can improve physical performance.
Bodybuilders can train their intercostal muscles through "resisted breathing" exercises, which require hardware such as the Airofit or PowerLung.
