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The axioscapular muscles are a group of shoulder muscles that attach the scapula to the thorax and include the serratus anterior, the trapezius, the rhomboids, and the levator scapulae posteriorly, and the pectoralis minor anteriorly. These muscles are responsible for positioning the scapula optimally for the humeral head and play a crucial role in shoulder function and stabilization. Alterations in axioscapular muscle behaviour have been observed in individuals with neck pain and scapular downward rotation (SDR), with potential implications for pain management and rehabilitation. Understanding the anatomy and function of the axioscapular muscles is essential for effective shoulder rehabilitation and maintaining optimal shoulder health.
| Characteristics | Values |
|---|---|
| Definition | Muscles that run from the axial skeleton (vertebrae, sternum, and ribs) to the scapula |
| Function | Primarily involved with the movements of the scapula and do not directly affect movement at the true glenohumeral joint |
| Muscle Groups | Axioscapular, Axiohumeral, and Scapulohumeral |
| Axioscapular Muscles | Serratus Anterior, Trapezius, Rhomboids, Levator Scapulae, and Pectoralis Minor |
| Axiohumeral Muscles | Pectoralis Major and Latissimus Dorsi |
| Scapulohumeral Muscles | Supraspinatus, Infraspinatus, Teres Minor, Subscapularis, Deltoid, and Teres Major |
| Rehabilitation | Exercises aimed at restoring normal function and movement of the shoulder |
| Neck Pain | Associated with altered muscle behavior, particularly in patients with scapular downward rotation (SDR) |
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What You'll Learn
Axioscapular muscles attach the scapula to the thorax
The shoulder functions as a kinetic chain, a series of links and segments that are activated sequentially to generate and transmit force. The axioscapular shoulder muscles, which attach the scapula to the thorax, play a crucial role in this process. These muscles include the serratus anterior, the trapezius, the rhomboids, and the levator scapulae, which are positioned posteriorly, and the pectoralis minor, which is located anteriorly.
The serratus anterior muscle, originating from the ribs and intercostal fascia, inserts along the anterior surface of the scapula. It has three parts: superior, middle, and inferior. The superior part arises from ribs 1-2, the middle part from ribs 3-6, and the inferior part from ribs 7-9 or sometimes even rib 10. These different parts allow the muscle to have a wide range of motion and contribute to the complex movements of the shoulder.
The trapezius muscle is a large and versatile muscle with multiple functions. It can draw the scapula superomedially, extend and laterally flex the head and neck, and rotate the head. Additionally, the trapezius muscle has distinct parts, each with specific functions. The descending part contributes to the extension and lateral flexion of the head and neck, while the transverse part draws the scapula medially, and the ascending part draws it inferomedially.
The rhomboids, consisting of the rhomboid major and minor, work together with the levator scapulae to position the scapula optimally. These muscles belong to the group of extrinsic and intrinsic muscles of the back and play a crucial role in scapular stabilization. The levator scapulae is specifically responsible for suspending the scapula on the thoracic wall and rotating it by drawing its inferior angle laterally.
The pectoralis minor, located anteriorly, is part of the anterior axio-appendicular muscles or thoraco-appendicular muscles. It works in conjunction with other anterior shoulder muscles, such as the pectoralis major, subclavius, and serratus anterior, to attach the upper extremity to the clavicle and thoracic cage. This group of muscles is essential for the stability and movement of the shoulder girdle, connecting the upper limb to the axial skeleton of the trunk.
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They include the serratus anterior, trapezius, rhomboids, and levator scapulae
The axioscapular muscles are a group of muscles that attach the scapula to the thorax. They include the serratus anterior, trapezius, rhomboids, and levator scapulae. These muscles work together to position the scapula and provide stability to the shoulder.
The serratus anterior is a thin, fan-shaped muscle that originates on the superolateral surfaces of the ribs at the lateral wall of the thorax. It wraps around the rib cage and inserts along the superior angle, medial border, and inferior angle of the scapula. The serratus anterior is a key scapular stabiliser, keeping the shoulder blades against the rib cage during rest and movement. It is also involved in scapular protraction and upward rotation.
The trapezius muscles are two large muscles located on either side of the upper back. They start at the base of the neck and extend across the shoulders, connecting to the skull, spine, ribs, and shoulder blades. These muscles help with various movements, including turning the head, adjusting posture, twisting the torso, shrugging the shoulders, and moving the shoulders during activities such as lifting or throwing.
The rhomboids consist of two muscles: the rhomboid major and minor. These muscles are found immediately deep to the trapezius. They receive innervation from the dorsal scapular nerve and play a crucial role in upper limb movement and stability of the shoulder girdle and scapula. The rhomboid muscles help retract, elevate, rotate, and protract the scapula, contributing to the stability of the shoulder.
The levator scapulae is a posterior axio-appendicular muscle that connects the upper limb to the vertebral column. It originates on the posterior tubercle of the transverse process of cervical vertebrae 1 to 4 and inserts onto the vertebral margin of the scapula. This muscle helps in elevating and rotating the scapula and stabilising the vertebral column during rotation.
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They are scapular stabilizing muscles
The axioscapular muscles are a group of shoulder muscles that attach the scapula to the thorax. They are also referred to as scapular stabilising muscles. These muscles include the serratus anterior, the trapezius, the rhomboids, and the levator scapulae posteriorly, and the pectoralis minor anteriorly. The serratus anterior muscle is divided into three parts—superior, middle, and inferior—which differ in origins and insertions. The superior part originates from the first and second ribs and intercostal fascia, while the middle part originates from the third to sixth ribs. The inferior part originates from the seventh to ninth ribs, sometimes including the tenth rib and the external oblique muscle.
The trapezius muscle has multiple functions relating to activity and arm position due to its large size and varying directions of muscle fibres. The descending part of the trapezius draws the scapula superomedially, extends and laterally flexes the head and neck, and rotates the head. Meanwhile, the transverse part draws the scapula medially, and the ascending part draws it inferomedially.
The axioscapular muscles play a crucial role in shoulder function by stabilising the scapula. This stability is essential for the optimal positioning of the humeral head and the overall function of the shoulder. In the case of individuals with neck pain, altered behaviour and reduced thickness of the axioscapular muscles have been observed, particularly in those exhibiting scapular downward rotation (SDR).
The effectiveness of exercise therapy for individuals with subacromial impingement syndrome has been studied, comparing the sequences of axioscapular (scapular stabilisation) and scapulohumeral (rotator cuff) strengthening exercises. The results indicated a slight trend towards superior outcomes at both the eight and 16-week follow-up intervals when the initial focus was on scapular stabilisation exercises.
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They position the scapula for the humeral head
The axioscapular muscles are a group of shoulder muscles that attach the scapula to the thorax. These muscles include the serratus anterior, the trapezius, the rhomboids, and the levator scapulae posteriorly, and the pectoralis minor anteriorly. They are responsible for positioning the scapula optimally for the humeral head. The humeral head refers to the upper end of the humerus bone in the arm, which forms a ball-and-socket joint with the scapula's glenoid cavity, known as the glenohumeral joint.
The glenohumeral joint allows for a wide range of motion in the shoulder, with the scapula contributing to the elevation of the humerus through upward rotation, posterior tilt, and external rotation. The serratus anterior and trapezius muscles, due to their large size and varying muscle fibre directions, play a crucial role in this process and can influence multiple functions related to activity and arm position. For instance, the trapezius muscle's insertion into the medial border of the acromion contributes to the upward rotation of the scapula.
The interplay between the scapula and the humerus, known as scapulohumeral rhythm, is essential for the optimal function of the shoulder. Any change in the normal position of the scapula relative to the humerus can lead to a dysfunction called scapular dyskinesia. This disturbance in rhythm can result in reduced scapulothoracic movement and issues such as fatigue, impingement, instability, and limited elevation. Therefore, the axioscapular muscles' role in positioning the scapula is vital to maintaining the proper scapulohumeral rhythm and overall shoulder function.
Abnormal scapular kinematics can arise from alterations in anatomy, physiology, or biomechanics. In such cases, the goal of functional rehabilitation is to restore normal function and kinematics, ensuring the integrity of the kinetic chain. Exercises aimed at strengthening the axioscapular muscles, such as scapular stabilization exercises, have been shown to be beneficial in treating conditions like subacromial impingement syndrome. By focusing on the axioscapular muscle group, patients can experience improvements in pain and function, highlighting the importance of these muscles in maintaining the optimal position of the scapula for the humeral head.
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They are involved in the movement of the scapula
The axioscapular muscles are a group of muscles that run from the axial skeleton (vertebrae, sternum, and ribs) to the scapula. They are primarily involved in the movement of the scapula and include the pectoralis minor, trapezius, rhomboid major and minor, levator scapulae, and serratus anterior. These muscles attach the scapula to the thorax and play a crucial role in positioning the scapula optimally for the humeral head.
The serratus anterior, for instance, has three parts with different origins and insertions: the superior, middle, and inferior. The superior part originates from the first and second ribs and the intercostal fascia, inserting at the anterior surface of the superior angle of the scapula. The middle part originates from the third to sixth ribs and inserts along the anterior surface of the entire medial border of the scapula. The inferior part originates from the seventh to ninth ribs and sometimes includes the tenth rib or the external oblique muscle, inserting along the lower medial border and inferior angle of the scapula.
The trapezius muscle also has specific functions within the axioscapular group. The descending part of the trapezius draws the scapula superomedially, extends and laterally flexes the head and neck, and rotates the head. The transverse part draws the scapula medially, while the ascending part draws it inferomedially.
The importance of scapular stability for shoulder function has been highlighted in studies investigating the relationship between axioscapular muscles and neck pain. These studies observed altered muscle behavior in individuals with neck pain, specifically those exhibiting scapular downward rotation (SDR). The findings suggest that SDR may limit the ability of the axioscapular muscles to stabilize the scapula during loaded upper limb tasks, potentially causing or exacerbating neck pain.
In summary, the axioscapular muscles are essential for the movement and stability of the scapula, with specific muscles within this group exhibiting unique functions and attachments to facilitate optimal scapular positioning and movement.
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Frequently asked questions
The axioscapular muscles are those that run from the axial skeleton (vertebrae, sternum, and ribs) to the scapula. They include the pectoralis minor, trapezius, rhomboid major and minor, levator scapulae, and serratus anterior.
The axioscapular muscles are involved with the movements of the scapula and help to position the scapula optimally for the humeral head. They also provide scapular stability, which is important for shoulder function.
Yes, there are exercises and training sequences aimed at the axioscapular muscles, particularly for patients with subacromial impingement syndrome or nonspecific neck pain.
The axioscapular muscles are made up of extrinsic and intrinsic muscles. The extrinsic muscles include the trapezius and latissimus dorsi, while the intrinsic muscles include the levator scapulae and rhomboid muscles.
