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The scapula, or shoulder blade, is a triangular bone in the upper back that connects the clavicle to the humerus. It is supported by a complex system of muscles that work together to help move the arm. The scapula provides attachment points for several groups of muscles, including the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus. These intrinsic muscles attach directly to the scapular surface and assist with the rotation of the glenohumeral joint. The extrinsic muscles of the scapula include the triceps, biceps, and deltoid, while the levator scapulae, trapezius, rhomboids, and serratus anterior are responsible for rotational movements and stabilization. Disorders of the scapula can cause pain and difficulty moving the arm, often requiring physical therapy to strengthen the surrounding muscles and restore proper positioning.
| Characteristics | Values |
|---|---|
| Description | A long and slender muscle that belongs to the superficial layer of extrinsic muscles of the back |
| Function | Elevate the scapula, elevate and retract the shoulder girdle, prevent depression of the girdle, stabilize the scapula, and assist with abduction and external and internal rotation of the glenohumeral joint |
| Origin | Transverse processes of vertebrae C1-C4 |
| Insertion | Superior angle and medial border of scapula |
| Innervation | Cervical nerve (C3-C4) and dorsal scapular nerve (C5) |
| Blood Supply | Thyrocervical trunk, transverse cervical artery, ascending cervical artery, and vertebral artery |
| Attachments | Connects the top of the shoulder blade to the neck |
| Related Disorders | Scapular dyskinesis, winged scapula |
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What You'll Learn
- The scapula (shoulder blade) is a bone in the upper back that connects the clavicle to the humerus
- The scapula is surrounded and supported by a complex system of muscles that work together to help move the arm
- The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus
- The extrinsic muscles include the triceps, biceps, and deltoid
- Disorders of the scapula can be treated with physical therapy to strengthen the muscles in the shoulder and restore scapular positioning and motion
The scapula (shoulder blade) is a bone in the upper back that connects the clavicle to the humerus
The scapula, or shoulder blade, is a sturdy, flat, triangular bone in the upper back. It connects the clavicle to the humerus and forms the posterior of the shoulder girdle. The scapula is supported by a complex system of muscles that work together to enable arm movement. These muscles are divided into three groups: intrinsic, extrinsic, and a third group of muscles that includes levator scapulae, trapezius, rhomboids, and serratus anterior.
The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus. These muscles attach directly to the scapular surface and assist with abduction and external and internal rotation of the glenohumeral joint. The extrinsic muscles include the triceps, biceps, and deltoid.
The third group of muscles includes the levator scapulae, which originates from the transverse processes of the first four cervical vertebrae and inserts at the superior angle and medial border of the scapula. The levator scapulae elevates and retracts the shoulder girdle, preventing depression of the girdle when carrying heavy loads. It also stabilises the scapula and participates in the inferior rotation of the glenoid cavity.
The scapula is a critical bone in the function of the shoulder joint, enabling six types of motion: protraction, retraction, elevation, depression, upward rotation, and downward rotation. These motions allow for full-functional upper extremity movement and healthy posture. Disorders of the scapula can cause difficulty in moving the arm, especially during overhead activities. Treatment typically involves physical therapy to strengthen the muscles and restore proper scapular positioning and motion.
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The scapula is surrounded and supported by a complex system of muscles that work together to help move the arm
The scapula, or shoulder blade, is a sturdy, flat, triangular bone that lies in the upper back. It connects the clavicle to the humerus, forming the posterior of the shoulder girdle. The scapula is surrounded and supported by a complex system of muscles that work together to facilitate arm movement. These muscles can be classified into three groups: intrinsic, extrinsic, and a third group of muscles that includes levator scapulae, trapezius, rhomboids, and serratus anterior.
The intrinsic muscles of the scapula include the rotator cuff muscles (teres major, subscapularis, teres minor, and infraspinatus). These muscles attach directly to the scapular surface and assist with abduction and external and internal rotation of the glenohumeral joint. The extrinsic muscles include the triceps, biceps, and deltoid.
The third group of muscles includes the levator scapulae, which originates from the transverse processes of the first four cervical vertebrae and inserts on the vertebral margin of the scapula. The levator scapulae muscle is responsible for elevating and retracting the shoulder girdle at the scapulothoracic joint. It also helps prevent depression of the girdle when carrying heavy loads and participates in the stabilization of the scapula.
The trapezius, rhomboids, and latissimus dorsi muscles are responsible for retraction, bringing the scapulae closer to the spine and assisting in maintaining good shoulder alignment. The serratus anterior muscle is located on the outside of the rib cage and is crucial for rotating the shoulder blade, allowing the arm to be raised above the head.
These muscles work together to provide a full range of motion for the arm, making it possible to perform various activities and exercises such as scapular push-ups, which are commonly used for shoulder warm-up and recovery.
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The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus
The scapula, or shoulder blade, is a sturdy, flat, triangular bone that connects the clavicle to the humerus. It forms the posterior of the shoulder girdle. The scapula provides attachment points for several groups of muscles, including the intrinsic muscles, which attach directly to the surface of the bone. These intrinsic muscles include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus.
The rotator cuff is a group of four muscles that originate from the scapula and attach to the humeral head. They are the supraspinatus, infraspinatus, subscapularis, and teres minor. These muscles collectively act to stabilise the glenohumeral joint by compressing the humeral head into the glenoid fossa, providing additional stability to the shoulder joint. They also have individual actions, with the supraspinatus and deltoid muscle, for example, assisting with arm abduction. The supraspinatus is the muscle most commonly affected by rotator cuff tendonitis, which is caused by repetitive use of the shoulder joint.
The teres major forms the inferior border of the quadrangular space, through which the axillary nerve and posterior circumflex humeral artery pass. The subscapularis is the largest component of the posterior wall of the axilla and prevents the anterior dislocation of the humerus during abduction, while also medially rotating the humerus. The infraspinatus is a powerful lateral rotator of the humerus, and the teres minor is a narrow and long muscle covered by the deltoid.
The intrinsic muscles of the scapula, along with the extrinsic muscles (triceps, biceps, and deltoid) and a third group of muscles (levator scapulae, trapezius, rhomboids, and serratus anterior), work together to enable the six types of motion of the scapula. These motions include protraction, retraction, elevation, depression, upward rotation, and downward rotation, allowing for full-functional upper extremity movement and making the shoulder joint one of the most mobile and versatile in the human body.
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The extrinsic muscles include the triceps, biceps, and deltoid
The scapula, or shoulder blade, is a sturdy, flat, triangular bone that connects the clavicle to the humerus. It forms the posterior of the shoulder girdle and is an important bone for the function of the shoulder joint. The scapula is surrounded and supported by a complex system of muscles that work together to help move the arm.
The scapular muscles can be divided into three groups: intrinsic, extrinsic, and the third group of muscles. The extrinsic muscles attach to the processes of the scapula and affect motion at the glenohumeral joint. They include the triceps, biceps, and deltoid. The triceps brachii is a large, thick muscle on the dorsal part of the upper arm, often appearing as a horseshoe shape. It originates from the dorsal muscle mass of the upper limb bud and has three heads: the medial, lateral, and long head. The triceps' primary function is extending the forearm at the elbow joint, opposing the action of flexors such as the biceps brachii. The triceps brachii gets its name from its three muscle heads or points of origin, with 'Brachii' referring to the arm. The biceps brachii, meanwhile, is one of three muscles located in the anterior compartment of the upper arm, along with the coracobrachialis and brachialis. These muscles are all innervated by the musculocutaneous nerve.
The deltoid is targeted by static contraction movements such as pullovers, straight-arm pull-downs, and bent-over lateral raises. These exercises also build the latissimus dorsi. The deltoid is also targeted by pressing movements such as push-ups, bench presses, and tricep dips, with a wider grip emphasising the deltoids over the outer chest.
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Disorders of the scapula can be treated with physical therapy to strengthen the muscles in the shoulder and restore scapular positioning and motion
The scapula, or shoulder blade, is a sturdy, flat, triangular bone that connects the clavicle to the humerus. It forms the posterior of the shoulder girdle and is a site for the attachment of multiple muscles around the shoulder. The scapula engages in six types of motion, allowing for full-functional upper extremity movement, including protraction, retraction, elevation, depression, upward rotation, and downward rotation.
Disorders of the scapula, such as scapular dyskinesis, can cause abnormal scapular movement, discomfort, shoulder pain, and impingement. Treatment for scapular disorders typically involves physical therapy designed to strengthen the muscles in the shoulder and restore proper scapular positioning and motion. This may include exercises such as scapular assistance tests (SATs), where a doctor applies gentle pressure to assist the scapula upward as the patient elevates their arm. Imaging tests such as X-rays, CT scans, or MRI scans may be ordered if a bony abnormality or injury is suspected.
In some cases, home treatments such as improving posture, balancing upper body strength sessions, and heat therapy can help alleviate tight shoulder muscles and improve symptoms of scapular dyskinesis. Nonsteroidal anti-inflammatory drugs (NSAIDs) can also be used to relieve pain and swelling. Once normal scapular position and motion are restored, a maintenance conditioning program of flexibility and strengthening exercises may be recommended to prevent further issues.
Overall, physical therapy plays a crucial role in treating disorders of the scapula by focusing on strengthening the muscles around the shoulder and restoring proper scapular positioning and motion. This, combined with other treatments and exercises, can effectively manage and improve scapular disorders and their associated symptoms.
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Frequently asked questions
The scapula, or shoulder blade, is a sturdy, flat, triangular bone that lies in the upper back. It connects the clavicle to the humerus and forms the posterior of the shoulder girdle.
The scapular muscles are a complex system of muscles that work together to help you move your arm. The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus. The extrinsic muscles include the triceps, biceps, and deltoid.
A common scapular disorder is scapular dyskinesis, which can cause weakness in the muscles and abnormal motion patterns. Another disorder is winging of the scapula, which can occur after injury to the long thoracic or spinal accessory nerves.
