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The thoracic spine is a rigid structure that is less prone to injury than the cervical spine (neck) and lumbar spine (lower back). The thoracic region of the spine is made up of 12 pairs of nerves that carry messages between the brain and muscles. The muscles of the thoracic spine enable movement and provide stability. There are five muscles that make up the thoracic cage: the intercostals (external, internal, and innermost), subcostales, and transversus thoracis. These muscles act to change the volume of the thoracic cavity during respiration.
| Characteristics | Values |
|---|---|
| Definition | The thoracic wall forms the anterior, posterior, and lateral boundaries of the thorax. |
| Composition | The thoracic cage is made up of five muscles: the intercostals (external, internal, and innermost), subcostales, and transversus thoracis. |
| Function | These muscles act to change the volume of the thoracic cavity during respiration. |
| Innervation | Intercostal nerves (T1-T11). |
| Attachments | The intercostal muscles attach to the ribs. |
| Action | The internal intercostals stabilise the position of the ribs during normal respiration and depress the ribs during forced expiration. |
| Layers | The intercostal muscles are organised into three layers: superficial, intermediate, and deep. |
| Additional Muscles | Accessory muscles of respiration include the pectoralis major, minor, serratus anterior, and scalene muscles. |
| Spinal Nerves | The thoracic spine has twelve pairs of spinal nerves that branch off from the spinal cord. |
| Spinal Stability | The four major groups of muscles in the thoracic spine are the superficial, intermediate, deep, and intercostals. |
| Pain Conditions | Thoracic spine pain can be superficial or deep. Superficial pain is sharp and localised, while deep somatic pain occurs from irritation of structures such as muscles. |
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What You'll Learn
- The thoracic spine is made up of 12 pairs of nerves
- The thoracic cage is formed by five muscles
- The transversus thoracic muscle is a thin muscle consisting of four to five slips
- The intercostal muscles are a group of thin muscles situated between the ribs
- The erector spinae group is composed of the iliocostalis, longissimus, and spinalis
The thoracic spine is made up of 12 pairs of nerves
The thoracic spine is the middle section of the spine, starting at the base of the neck and ending at the bottom of the ribs. It is the longest section of the spine and consists of 12 vertebrae, labelled T1 through T12. These vertebrae are small, stacked bones that form the spinal canal, a tunnel that houses and
The thoracic spine is surrounded by muscles, tendons, and ligaments that aid movement and flexibility. The erector spinae group, for instance, is composed of the iliocostalis, longissimus, and spinalis muscles. The intercostal muscles, meanwhile, play a critical role in breathing mechanics. These include the external, internal, and innermost intercostal muscles, which are involved in inhalation and exhalation. The thoracic spine also houses much of the autonomic nervous system, which modulates pain syndromes.
The thoracic spine is generally less prone to injury than the lumbar (lower back) and cervical (neck) spine due to its rigidity and stability. However, pain in the thoracic region can result from various conditions affecting the interconnected bones, nerves, muscles, ligaments, and tendons. For instance, thoracic radiculopathy can develop from inflamed thoracic nerves, causing pain, tingling, numbness, and weakness along the nerve root.
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The thoracic cage is formed by five muscles
The thoracic cage, or rib cage, forms the chest portion of the body, also known as the thorax. It is formed by 12 pairs of ribs, their costal cartilages, and the sternum. The ribs are anchored posteriorly to the 12 thoracic vertebrae. The sternum, a vertical bone located in the midline, consists of three distinct bony parts: the manubrium, body, and xiphoid process. The thoracic cage takes the form of a domed bird cage, with the horizontal bars formed by ribs and costal cartilages. It is supported by the sternum in the front and the 12 thoracic vertebrae at the back.
The thoracic cage has several important functions. Firstly, it supports and protects the vital organs within the thorax, such as the heart, lungs, and aorta. Secondly, its rigid structure allows it to serve as an attachment point for many muscles of the upper body, providing support for the weight of the upper limbs. Additionally, the thoracic cage facilitates breathing by resisting the negative pressure generated by the elastic recoil of the lungs and respiration-induced movements.
The thoracic wall, which forms the anterior, posterior, and lateral boundaries of the thorax, is comprised of five muscles. These muscles work to change the volume of the thoracic cavity during respiration. The intercostal muscles, which lie in the intercostal spaces between the ribs, are organised into three layers: external, internal, and innermost intercostal muscles. During inspiration, the external intercostal muscles contract to lift the rib cage upward and outward, drawing air into the lungs. The internal intercostal muscles lie deep to the external intercostals and are oriented in the opposite direction. During forced expiration, these muscles depress the ribs and decrease the thoracic volume. The innermost intercostal muscles are the deepest layer and are involved in exhalation, assisting in depressing the rib cage to expel air from the lungs.
In addition to the five muscles that form the thoracic wall, there are accessory muscles of respiration that attach to the thoracic cage. These include the pectoralis major, pectoralis minor, serratus anterior, and scalene muscles.
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The transversus thoracic muscle is a thin muscle consisting of four to five slips
The transversus thoracic muscle is always a concern during the harvesting of the internal thoracic artery. This is because the muscle is poorly described in the surgical literature. The muscle is also the most variable in the human body, showing variations in its attachments not only in different subjects but also on the opposite sides of the same subject.
The muscle is one of the thoracic wall muscles that act primarily during breathing. It is also essential for maintaining posture and stability. The thoracic spine has several important functions, including housing much of the autonomic nervous system of the human body. This system is a well-known modulator of pain syndromes.
The thoracic spine nerves include:
- T1 and T2 nerves: These nerves go into the top of the chest and into the arms and hands.
- T3 through T5 nerves: These nerves go into the chest wall and help control the rib cage, lungs, diaphragm, and the muscles that help with breathing.
- T6 through T12 nerves: These nerves affect the abdominal and back muscles and help with balance and posture. They also help with coughing.
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The intercostal muscles are a group of thin muscles situated between the ribs
The thoracic spine is a stable structure that houses the autonomic nervous system of the human body. The thoracic cage, which forms the skeleton of the chest, is made up of the thoracic vertebrae, ribs, and sternum. The thoracic spine is less prone to injury than the cervical spine (neck) and lumbar spine (lower back).
The external intercostals are the most superficial intercostal muscles. They originate from the inferior border of one rib and insert into the superior border of the rib below. During inhalation, the external intercostal muscles contract and pull together to lift the rib cage upward and outward, drawing air into the lungs. The internal intercostals lie deep to the external intercostal muscles and are oriented in the opposite direction. They originate from the costal groove of one rib and insert into the superior border of the rib below. The internal intercostals are responsible for depressing the ribs during forced expiration, aiding in quiet and forced exhalation.
The innermost intercostals are the deepest layer of intercostal muscles. They originate from the posterior surface of the costal groove of one rib and may skip ribs. They work with the internal intercostals to assist in depressing the rib cage, which expels air from the lungs during exhalation. The innermost intercostals also help with forcefully pushing air out of the lungs during actions like coughing or sighing.
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The erector spinae group is composed of the iliocostalis, longissimus, and spinalis
The thoracic spine is less likely to get damaged and cause pain compared to the cervical spine (neck) and lumbar spine (lower back). The thoracic region of the spine has several important functions, including housing much of the autonomic nervous system of the human body. The erector spinae group is composed of the iliocostalis, longissimus, and spinalis. These muscles are long, thin, and lie adjacent to one another, with the iliocostalis on the outside edge.
The iliocostalis is a thin muscle that is lateral to the longissimus. It originates from the spinous process of T11-L5 and attaches to the ribs, and it functions to laterally flex the vertebral column. The longissimus is a long, thin muscle situated between the iliocostalis and spinalis, and is part of the erector group. It is the thickest and longest muscle of the erector spinae group. The longissimus muscle forms the main bulk of the erector group and it functions to extend and laterally flex the spine.
The spinalis is a long, thin medial muscle that is part of the erector spinae group. It is the most medial of the erector spinae muscles. The spinalis is closest to the midline of the spine and is responsible for thoracic extension, lateral flexion, and rotation. The spinalis muscles are innervated by the lateral branches of the posterior rami of the cervical, thoracic, and lumbar spinal nerves. The erector spinae muscles as a whole are involved in spinal stability and low back pain. They work together with the glutes to maintain a stable posture when standing or sitting.
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Frequently asked questions
The thoracic spine is the middle 12 vertebrae of the human spine, which is made up of 24 spinal bones. The spinal column is the body's main upright support.
The five muscles that make up the thoracic cage are the intercostals (external, internal and innermost), subcostales, and transversus thoracis.
The muscles of the thoracic spine enable movement and provide stability. They are organised in layers, with each layer having specific roles and muscle groups.
