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The rhomboid muscles are a group of muscles in the upper back, consisting of two functionally similar muscles: the rhomboid major and the rhomboid minor. These muscles are important for upper limb movement and stability of the shoulder girdle and scapula. They work together with other muscles to elevate, retract, and rotate the scapula, and prevent scapular winging.
| Characteristics | Values |
|---|---|
| Number of Rhomboid Muscles | 2 |
| Names of the Two Rhomboid Muscles | Rhomboid Major, Rhomboid Minor |
| Shape of the Rhomboid Major | Quadrangular, Broad, Diamond-shaped |
| Shape of the Rhomboid Minor | Cylindrical, Small |
| Rhomboid Muscle Group | Deep Intrinsic Shoulder Muscles |
| Rhomboid Muscle Function | Retraction, Elevation, Rotation of the Scapula |
| Rhomboid Muscle Nerve Supply | Dorsal Scapular Nerve |
| Rhomboid Muscle Vascular Supply | Dorsal Scapular Artery |
| Rhomboid Muscle Surgery | Rare |
| Rhomboid Muscle Clinical Pathologies | Winged Scapula, Rhomboid Palsy |
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What You'll Learn
The rhomboid major is a skeletal muscle of the back
The rhomboids are a group of muscles formed by the rhomboid major and minor. They are located in the upper back and are important for upper limb movement and stability of the shoulder girdle and scapula. The rhomboid major is a quadrangular or quadrilateral muscle located inferior to the rhomboid minor. It is considered a superficial back muscle and is deep to the trapezius muscle. The rhomboid major helps to hold the scapula and thus the upper limb onto the ribcage. It also acts to retract the scapula, pulling it towards the vertebral column.
The rhomboid major is a broad muscle that originates from the spinous processes of the second to fifth thoracic vertebrae (T2-T5) and the supraspinous ligament. It extends obliquely in an inferolateral direction to insert into the medial border of the scapula, between the inferior angle and root of the spine of the scapula. The attachment takes place on both the dorsal and costal aspects of the medial border of the scapula. The rhomboid major is one of the deeper intrinsic shoulder muscles that form the shoulder girdle. It works together with muscles such as the sternocleidomastoid, trapezius, pectoralis muscles, latissimus dorsi, and serratus anterior.
The rhomboid major receives innervation from the dorsal scapular nerve (DSN), which originates from the ventral ramus of the spinal nerve root C5. The dorsal scapular nerve courses posterior inferiorly through the middle scalene muscles and between the posterior scalene, levator scapulae, and serratus posterior superior. It then continues deep to the brachial plexus to innervate the rhomboid major and minor muscles at their anterior border. The rhomboid major also receives its vascular supply from the dorsal scapular artery (DSA). The DSA generally arises from the second or third portion of the subclavian artery and passes through the brachial plexus to supply the rhomboid muscles.
The rhomboid major plays a crucial role in scapular stability and movement. It works in conjunction with other muscles to elevate, retract, and rotate the scapula. The rhomboid major helps to prevent scapular winging and maintains proper shoulder mechanics. Weakness or loss of nerve function in the rhomboid major can lead to scapular winging, excessive lateral rotation, and depression of the scapula. This can result in pain, discomfort, and limited range of motion in the shoulder and upper back. Strengthening the rhomboid muscles through exercises, Pilates, or yoga can help improve upper body posture and relieve pain.
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The rhomboid minor is a small cylindrical muscle
The rhomboids are a group of muscles formed by the rhomboid major and minor. They are two separate muscles found deep to the trapezius. The rhomboid minor is a small, cylindrical muscle that consists of two layers: the dorsal and ventral. It originates at the ligamentum nuchae and C7 and T1 vertebra and inserts at the scapula's medial border near the base of the spine of the scapula. The rhomboid minor muscle is important for upper limb movement and stability of the shoulder girdle and scapula. It works together with the rhomboid major and other muscles to anchor the scapula and prevent winging.
The rhomboid minor muscle has a dorsal layer that attaches dorsolateral and inferior to the levator scapulae, while the ventral layer inserts inferomedially to the levator scapulae. At the insertion point of the ventral layer, the fasciae of the rhomboid minor and serratus anterior muscles unite. The rhomboid minor muscle is innervated by the dorsal scapular nerve, which originates from the ventral ramus of the spinal nerve root C5. It receives its vascular supply from the dorsal scapular artery, which generally arises from the second or third portion of the subclavian artery.
The rhomboid minor muscle is one of the deep intrinsic shoulder muscles that form the shoulder girdle. It works in conjunction with muscles such as the sternocleidomastoid, trapezius, pectoralis muscles, latissimus dorsi, and serratus anterior. This group of muscles is crucial for the movement and stabilization of the shoulder through articulation with the trunk. The rhomboid minor muscle helps to retract, elevate, and rotate the scapula, contributing to the overall stability and function of the shoulder complex.
The rhomboid minor muscle plays a significant role in shoulder mechanics and upper body posture. Strengthening the rhomboid minor and other muscles responsible for scapular retraction can help relieve pain and improve posture. Weakness or loss of nerve function in the rhomboid muscles can lead to winging of the scapula and inferior scapular angle rotation. Additionally, the rhomboid minor muscle is susceptible to strains and tears, especially in individuals who do not exercise regularly or maintain correct shoulder placement during activities.
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The rhomboids are important for upper limb movement
The rhomboids 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 important for upper limb movement and stability of the shoulder girdle and scapula.
The rhomboid minor is a small, cylindrical muscle that originates at the ligamentum nuchae and C7 and T1 vertebra. It inserts at the medial border of the scapula, near the base of the spine of the scapula. The rhomboid major is a quadrangular muscle located inferior to the rhomboid minor. It originates from the spinous processes of the T2-T5 vertebra and inserts on the medial border of the scapula, just inferior to the rhomboid minor.
The rhomboids work in conjunction with other muscles such as the levator scapulae and serratus anterior to elevate, retract, and rotate the scapula. They also help to anchor the scapula and prevent "winging". Additionally, the rhomboids play a vital role in actions such as pulling, throwing, and overhead arm movement.
The motor function of the rhomboid muscles is controlled by the dorsal scapular nerve (DSN), which provides innervation to the muscles. The rhomboids receive their vascular supply from the dorsal scapular artery (DSA), which generally arises from the second or third portion of the subclavian artery.
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The dorsal scapular nerve innervates the rhomboids
The rhomboids are a group of muscles formed by the rhomboid major and minor. They are two functionally similar muscles that are located in the upper back. The rhomboid minor is a cylindrical muscle that originates at the ligamentum nuchae and C7 and T1 vertebra. The rhomboid major is a quadrangular muscle located inferior to the rhomboid minor.
The dorsal scapular nerve is a motor nerve that provides innervation to the rhomboid major and minor muscles. It is formed from the anterior ramus of the C5 spinal nerve. The nerve passes through the substance of the middle scalene muscle and then passes between the posterior scalene, levator scapulae, and the serratus posterior superior muscle. It then runs across the medial scapular region, along the anterior border of the rhomboid muscles.
The dorsal scapular nerve is the sole motor supply to the rhomboid muscles. Therefore, an injury to the dorsal scapular nerve affects the function of the rhomboids. This presents as a lateral displacement of the scapula on the affected side, with patients reporting a limited range of motion in their shoulders and pain along the medial border of the scapula.
The function of the rhomboid muscles is to retract, elevate and rotate the scapula. They are important for the movement of the upper extremity and stabilization of the shoulder.
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Rhomboid dysfunctions can cause scapular winging
The rhomboid muscles are a group of two functionally similar muscles, the rhomboid major and rhomboid minor, located in the upper back. They are important for the movement and stability of the shoulder girdle and scapula. The rhomboid major is a quadrangular muscle located inferior to the rhomboid minor. The rhomboid minor, on the other hand, is a cylindrical muscle that originates at the ligamentum nuchae and C7 and T1 vertebra. It inserts at the scapula's medial border near the base of the spine of the scapula.
The serratus anterior, trapezius, and rhomboid major and minor muscles work together to anchor the scapula and prevent winging. Dysfunction, weakness, or loss of nerve function in the rhomboids can cause winging of the medial border of the scapula and inferior scapular angle rotation. This can be due to posture-related issues, such as incorrect shoulder placement during sports or carrying heavy objects, or a lack of regular exercise, which can lead to muscle weakness and susceptibility to strains and tears.
While some sources suggest that rhomboid weakness may not be the direct cause of scapular winging, it can contribute to the condition. Rhomboid weakness can cause the scapula to deviate down and out, and denervation or paralysis of the rhomboids can result in subtle winging of the medial border of the scapula as it lifts off the thoracic wall. Therefore, rhomboid dysfunctions can be a contributing factor to scapular winging, and proper diagnosis and treatment are important to address the condition effectively.
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Frequently asked questions
Rhomboid muscles are a group of muscles formed by the rhomboid major and minor. They are located in the upper back, under the trapezius muscle.
The rhomboids help form the shoulder girdle and are important for upper limb movement and stability of the shoulder. They retract, elevate and rotate the scapula.
The rhomboid minor originates at the ligamentum nuchae and C7 and T1 vertebra. The rhomboid major originates from the spinous processes of the T2-T5 vertebra.
The rhomboid muscles work with other muscles to anchor the scapula and prevent winging. They also help to hold the scapula and thus the upper limb onto the ribcage.
