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The rhomboid minor is a small skeletal muscle in the back that connects the scapula to the vertebrae of the spinal column. It is one of two muscles that make up the rhomboids, the other being the rhomboid major. The rhomboid minor is located between the scapula and the vertebral column, superior to the rhomboid major and immediately beneath the levator scapulae. The rhomboid minor muscle plays a crucial role in scapular movement and stability, working together with the rhomboid major to keep the scapula pressed against the thoracic wall.
| Characteristics | Values |
|---|---|
| Description | A small, slender, cylindrical muscle |
| Location | Between the scapula and the vertebral column |
| Layer | Second layer of the shoulder girdle muscles |
| Position | Superior to the rhomboid major, immediately beneath the levator scapulae, and deep to the trapezius muscle |
| Origin | Ligamentum nuchae, C7, and T1 vertebra |
| Insertion | Medial border of the scapula |
| Innervation | Dorsal scapular nerve (DSN) |
| Motor Function | Controlled by the DSN |
| Blood Supply | Arterial blood supply from the dorsal scapular artery |
| Function | Retraction, elevation, and rotation of the scapula; scapula adduction; scapula elevation and rotation; scapular retraction; scapula upward and downward rotation; scapular winging |
| Variants | Occipito-scapularis, rhomboideus-occipitalis or capitis, rhomboideus capitis |
| Injuries | Caused by repetitive movement, overuse of the shoulder girdle and arms, or poor posture |
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What You'll Learn
The rhomboid minor is a small, cylindrical muscle
The rhomboid minor is one of the two rhomboid muscles, the other being the rhomboid major. These muscles lie deep to the trapezius, forming parallel bands that pass from the vertebrae to the medial border of the scapula. The rhomboid minor is located superior to the rhomboid major, and together they help form the shoulder girdle. This group of muscles is essential for the movement of the upper extremity and stabilization of the shoulder through articulation with the trunk.
The rhomboid minor muscle derives its innervation predominantly from the dorsal scapular nerve, generally emerging from the C5 spinal nerve root. It acts as a synergist to the trapezius, working in tandem with the levator scapulae muscle to rotate the scapulae downward. The rhomboid minor also assists with scapular retraction, pulling the scapula towards the midline of the body or the vertebral column.
The rhomboid minor muscle is involved in various movements, including scapula adduction, elevation, and rotation. It is essential for activities like pulling movements, such as rowing or pulling a heavy object, and contributes to overall posture and shoulder function. However, poor posture can lead to rhomboid muscle injury due to constant stress on the muscles.
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It originates at the ligamentum nuchae and C7 and T1 vertebra
The rhomboid minor is a small, cylindrical muscle that is part of an intricate network of muscles in the upper back and shoulder girdle. It is one of two rhomboid muscles, the other being the rhomboid major. The rhomboid minor is located between the scapula and the vertebral column, superior to the rhomboid major, and immediately beneath the levator scapulae. It lies deep to the trapezius muscle, positioning it in close proximity to the vertebral column.
The rhomboid minor originates at the ligamentum nuchae and C7 and T1 vertebra. The ligamentum nuchae, or nuchal ligament, is a thick, fibrous, and elastic structure that stretches from the external occipital protuberance to the spinous process of the seventh cervical vertebra (C7). The external occipital protuberance is a noticeable bony prominence located at the base of the skull, on the back of the head. The C7 vertebra is the last cervical vertebra that forms the base of the neck, and the T1 vertebra is the first thoracic vertebra, right below the C7.
The rhomboid minor muscle derives its innervation predominantly from the dorsal scapular nerve, generally emerging from the C5 spinal nerve root. This nerve root is an integral component of the brachial plexus, which facilitates the transmission of neural impulses from the spinal cord to the superior extremities. The rhomboid minor also receives arterial blood supply from the dorsal scapular artery.
The rhomboid minor plays a crucial role in the movement and stability of the scapula. Its main actions include scapula adduction, elevation, and rotation. Together with the rhomboid major, the rhomboid minor retracts the scapula when the trapezius is contracted. They also work together to keep the scapula pressed against the thoracic wall and prevent scapular winging.
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It is innervated by the dorsal scapular nerve
The rhomboid minor is a small skeletal muscle in the back that connects the scapula to the vertebrae of the spinal column. It is one of two muscles that make up the rhomboids, the other being the rhomboid major. The rhomboid minor is located between the scapula and the vertebral column, superior to the rhomboid major, and immediately beneath the levator scapulae.
The rhomboid minor muscle is innervated by the dorsal scapular nerve, which originates from the ventral ramus of the spinal nerve root C5. The dorsal scapular nerve courses posteriorly and inferiorly through the middle scalene muscles and between the posterior scalene, levator scapulae, and the serratus posterior superior. It then continues deep into the brachial plexus to innervate the rhomboid minor and major muscles at their anterior border.
The dorsal scapular nerve plays an important role in the motor function of the rhomboid muscles. These muscles are responsible for scapular retraction, or the movement of the scapula towards the midline of the body or the vertebral column. The rhomboid minor and major also work together to keep the scapula pressed against the thoracic wall and prevent scapular winging.
The rhomboid minor and major muscles are essential for activities that involve pulling movements, such as rowing or pulling a heavy object. They also contribute to overall posture and shoulder function, including scapular adduction, elevation, and rotation. These muscles help to stabilize the scapula during the movement of the arm and shoulder, facilitating proper shoulder movement.
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The rhomboid minor and major retract the scapula
The rhomboids are a group of muscles formed by the rhomboid major and minor. They are important in 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 scapula's medial border near the base of the spine of the scapula. The rhomboid minor muscle derives its innervation predominantly from the dorsal scapular nerve, generally emerging from the C5 spinal nerve root.
The rhomboid major is a quadrangular muscle located inferior to the rhomboid minor. The origin of the rhomboid muscles is 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 rhomboid major and minor muscles are essential for activities like pulling movements, such as rowing or pulling a heavy object towards you, and contribute to overall posture and shoulder function. They are also involved in pushing movements, such as push-ups and press-ups, which are essential for scapula stabilization, elevation, and rotation.
The main action of the rhomboid muscles is scapular retraction around the scapulothoracic joint. Scapular retraction is a simultaneous sliding of the scapula superiorly and medially along the trunk. The rhomboid minor and major retract the scapula when the trapezius is contracted. Acting as a synergist to the trapezius, the rhomboid major and minor elevate the medial border of the scapula medially and upward, working in tandem with the levator scapulae muscle to rotate the scapulae downward.
The rhomboid major and minor muscles are two muscles localized on the second layers of muscles of the shoulder girdle, underneath the trapezius muscle. Together with other muscles, they help form the shoulder girdle. This group of muscles is important for the movement of the upper extremity and stabilization of the shoulder through articulation with the trunk. Functionally, the rhomboid muscles retract, elevate and rotate the scapula. They also protract the medial border of the scapula, keeping it in position at the posterior thoracic wall.
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The rhomboid minor plays a role in scapular adduction, elevation and rotation
The rhomboid minor is a small, cylindrical muscle located in the upper back, between the scapula and vertebral column. It is one of two rhomboid muscles, the other being the rhomboid major. The rhomboid minor is situated deep to the trapezius muscle, connecting the scapula to the vertebrae of the spinal column.
The rhomboid minor plays a crucial role in scapular movement and stability. Its primary action is the retraction of the scapula, pulling it towards the midline of the body. This movement is essential for maintaining proper shoulder mechanics and posture. The rhomboid minor also assists in scapular adduction, elevation, and rotation. During scapular adduction, the rhomboid minor works together with the rhomboid major to keep the scapula pressed against the thoracic wall. This prevents a condition called scapular winging, where the scapula protrudes away from the rib cage.
The rhomboid minor helps to elevate the scapula medially and upward, working in synergy with the levator scapulae muscle and other muscles like the trapezius and serratus posterior superior. This elevation is important for activities that involve arm elevation above shoulder height, such as tennis or volleyball.
Additionally, the rhomboid minor assists in scapular rotation. It works with the rhomboid major to rotate the scapula downward when lowering the arm from an overhead position. This downward rotation is the opposite of scapular upward rotation, which is also facilitated by the rhomboid muscles.
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Frequently asked questions
The rhomboid minor muscle is a small, cylindrical muscle that is part of the network of muscles in the upper back and shoulder girdle.
The rhomboid minor muscle is located between the scapula and the vertebral column. It is found superior to the rhomboid major muscle, underneath the levator scapulae and deep to the trapezius muscle.
The rhomboid minor muscle plays a crucial role in the movement and stability of the scapula. Its primary function is the retraction of the scapula, pulling it towards the midline of the body. It also assists in scapula elevation, rotation, and adduction.
The rhomboid minor muscle originates from the ligamentum nuchae, the C7 and T1 vertebrae, and the intervening supraspinous ligaments. It inserts onto the medial border of the scapula, which forms the shoulder blade.
The rhomboid minor muscle is important in maintaining proper upper body posture and shoulder mechanics. Weakness, dysfunction, or nerve complications can lead to issues such as scapular winging, where the scapula protrudes away from the rib cage. Poor posture can also cause rhomboid muscle injury due to constant stress on the muscle.
