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The rhomboid muscles are a group of muscles in the upper back, consisting of the rhomboid minor and rhomboid major. These muscles are responsible for scapular retraction, elevating and rotating the scapula, and protracting the medial border of the scapula. They are innervated by the dorsal scapular nerve, a branch of the brachial plexus, which originates from the ventral ramus of the spinal nerve root C5. The rhomboid muscles work together with other muscles such as the levator scapulae and serratus anterior to stabilize the scapula and prevent scapular winging. Weakness or loss of nerve function in the rhomboids can lead to winging of the scapula and inferior scapular angle rotation.
| Characteristics | Values |
|---|---|
| Number of rhomboid muscles | 2 |
| Names of the two rhomboid muscles | Rhomboid major and rhomboid minor |
| Shape of rhomboid major | Diamond-shaped |
| Relative size of rhomboid major and minor | Rhomboid major is larger |
| Type of muscle | Skeletal muscle |
| Muscle origin | Spinous processes of the T2-T5 vertebra |
| Muscle insertion | Medial border of the scapula |
| Innervation | Dorsal scapular nerve (DSN) |
| Nerve root | C5 |
| Nerve origin | Ventral ramus of the spinal nerve root C5 |
| Nerve course | Through the middle scalene muscles and between the posterior scalene and levator scapulae |
| Blood supply | Dorsal scapular artery |
| Function | Retracts, elevates and rotates the scapula |
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What You'll Learn
- The rhomboid major and minor muscles are innervated by the dorsal scapular nerve
- The nerve originates from the ventral ramus of the spinal nerve root C5
- The nerve passes through the middle scalene muscles and between the posterior scalene
- The dorsal scapular nerve continues deep into the brachial plexus
- The rhomboid muscles are important for scapular retraction and shoulder stability
The rhomboid major and minor muscles are innervated by the dorsal scapular nerve
The rhomboid muscles are a group of muscles in the upper back, consisting of two functionally similar muscles: the rhomboid minor and the rhomboid major. These muscles are located deep to the trapezius and form part of the shoulder girdle. The rhomboid major is the larger of the two muscles and is considered a superficial back muscle, while the rhomboid minor is a smaller, cylindrical muscle.
The dorsal scapular nerve plays a crucial role in controlling the motor function of the rhomboid muscles. These muscles have various functions, including retracting, elevating, and rotating the scapula, as well as protracting the medial border of the scapula to maintain its position at the posterior thoracic wall. The rhomboids work in conjunction with other muscles, such as the serratus anterior, trapezius, and levator scapulae, to anchor the scapula and prevent scapular winging.
By opposing excessive scapular protraction, the rhomboid muscles help maintain correct posture when sitting, standing, and walking. They are also important for the movement and stabilization of the shoulder girdle and scapula, as well as for upper limb movement. The rhomboid muscles receive their arterial blood supply from the dorsal scapular artery, which is one of the three sources of arterial blood for these muscles.
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The nerve originates from the ventral ramus of the spinal nerve root C5
The rhomboid muscles are a group of muscles in the upper back, consisting of the rhomboid minor and rhomboid major. They are responsible for scapular retraction, which involves sliding the scapula superiorly and medially along the trunk. This movement helps to maintain correct posture when sitting, standing, and walking.
The nerve that innervates the rhomboid muscles is called the dorsal scapular nerve (DSN). This nerve originates from the ventral ramus of the spinal nerve root C5. The spinal nerve root C5 is a cervical spinal nerve, which is a type of nerve that arises from the cervical spine, located in the neck region of the body.
The DSN courses posteriorly and inferiorly through the middle scalene muscles, located in the neck, and between the posterior scalene and levator scapulae muscles. The levator scapulae muscle is also innervated by the DSN. The nerve then continues deep into the brachial plexus, a network of nerves in the shoulder region, to innervate both the rhomboid minor and major muscles at their anterior border.
The rhomboid minor and major muscles receive motor control signals from the DSN, allowing them to function properly. These muscles, along with other muscles like the trapezius and serratus anterior, work together to stabilize the scapula and prevent a condition called scapular winging.
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The nerve passes through the middle scalene muscles and between the posterior scalene
The rhomboid muscles are a group of muscles formed by the rhomboid major and minor. They are important for upper limb movement and stability of the shoulder girdle and scapula. The rhomboids receive innervation from the dorsal scapular nerve (DSN), which originates from the ventral ramus of the spinal nerve root C5.
The DSN courses posteriorly and inferiorly through the middle scalene muscles and between the posterior scalene, levator scapulae, and serratus posterior superior. This passage of the nerve is specifically referred to when describing the innervation of the rhomboid muscles. The nerve passes through the middle scalene muscles, supplying innervation to the levator scapulae as it goes. The levator scapulae is one of the muscles that work together with the rhomboids to elevate and retract the scapula.
The DSN continues deep to the brachial plexus to innervate both the rhomboid minor and major muscles at their anterior border. The rhomboid major is a skeletal muscle of the back that connects the scapula with the vertebrae of the spinal column. It originates from the spinous processes of the thoracic vertebrae T2-T5 and the supraspinous ligament, inserting onto the lower portion of the medial border of the scapula.
The rhomboid minor is a small, cylindrical muscle that originates from the nuchal ligament and the spinous processes of the seventh cervical (C7) and first thoracic (T1) vertebrae. It extends obliquely in an inferolateral direction, inserting into the base of the medial end of the spine of the scapula. The rhomboid minor is located superiorly to the rhomboid major.
The main action of the rhomboid muscles is scapular retraction, which involves sliding the scapula superiorly and medially along the trunk. This movement rotates the glenoid cavity inferiorly, dropping the shoulder girdle. The rhomboids also work to protract the medial border of the scapula, keeping it in position at the posterior thoracic wall.
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The dorsal scapular nerve continues deep into the brachial plexus
The rhomboid muscles are a group of muscles in the upper back, consisting of two functionally similar muscles: the rhomboid minor and the rhomboid major. These muscles, along with the levator scapulae, help to elevate and retract the scapula, keeping it in position at the posterior thoracic wall. The rhomboids are important for upper limb movement and stability of the shoulder girdle and scapula.
The motor function of the rhomboid muscles is controlled by the dorsal scapular nerve (DSN). The DSN originates from the ventral ramus of the spinal nerve root C5. It courses posteriorly and inferiorly through the middle scalene muscles and between the posterior scalene and levator scapulae, to which it also provides innervation. The nerve then continues deep into the brachial plexus, a network of nerves in the neck and upper back, to innervate both the rhomboid minor and major muscles at their anterior border.
The brachial plexus is formed by the anterior divisions of the lower four cervical nerves and the first thoracic nerve. It gives rise to nerves that supply the chest, shoulder, and arm muscles. The dorsal scapular nerve is a branch of the brachial plexus, specifically arising from the C5 nerve root. This nerve provides innervation to the rhomboid muscles, as well as the levator scapulae and serratus posterior superior muscles.
By receiving innervation from the dorsal scapular nerve, the rhomboid muscles are able to perform their functions of scapular retraction, elevation, and rotation. This nerve supply allows the rhomboids to work in conjunction with other muscles, such as the levator scapulae and trapezius, to stabilize the scapula and prevent scapular winging. The rhomboids also play a role in maintaining correct posture and facilitating movements such as pulling, throwing, and overhead arm movements.
In summary, the dorsal scapular nerve continues deep into the brachial plexus to innervate the rhomboid muscles. This nerve supply enables the rhomboids to function properly, contributing to the stability and movement of the shoulder and upper limb.
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The rhomboid muscles are important for scapular retraction and shoulder stability
The rhomboid muscles are a group of deep intrinsic shoulder muscles that play a crucial role in scapular retraction and shoulder stability. They are composed of two functionally similar muscles: the rhomboid minor and the rhomboid major. These muscles lie deep to the trapezius muscle and form parallel bands that extend from the vertebrae to the medial border of the scapula.
The primary function of the rhomboid muscles is scapular retraction, which involves pulling the scapula towards the spine. This movement is essential for actions such as squeezing the shoulder blades together. Additionally, the rhomboids help elevate the scapula during shrugging and rotate it downwards. These movements are crucial for proper shoulder mechanics, especially during overhead activities.
The rhomboids are also important for maintaining scapular stability. They work in conjunction with other muscles, such as the serratus anterior, trapezius, and levator scapulae, to anchor the scapula and prevent "winging". Winging of the scapula occurs when there is dysfunction, weakness, or loss of nerve function in the rhomboid muscles, leading to abnormal movement of the scapula.
The motor function of the rhomboid muscles is controlled by the dorsal scapular nerve (DSN), which originates from the spinal nerve root C5. The DSN provides innervation to both the rhomboid minor and major muscles. A weak or imbalanced rhomboid can lead to scapular dyskinesis, an abnormal movement of the scapula that increases the risk of shoulder injuries such as rotator cuff tears or impingement syndromes. Therefore, it is essential to incorporate exercises that target the rhomboid muscles to maintain shoulder health and improve athletic performance.
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Frequently asked questions
The rhomboid muscles are innervated by the dorsal scapular nerve (DSN), a branch of the brachial plexus.
The rhomboid muscles help to retract, elevate and rotate the scapula. They also protract the medial border of the scapula, keeping it in position at the posterior thoracic wall.
The two types of rhomboid muscles are the rhomboid minor and the rhomboid major.
