What muscle does long thoracic nerve innervate?
the serratus anterior muscle
The long thoracic nerve is the motor nerve to the serratus anterior muscle, which functions to pull the scapula forward around the thorax, allowing for anteversion of the arm, and to lift the ribs, assisting in respiration.
What muscle is affected by winged scapula?
The most common etiology of a winged scapula is usually due to damage or impaired innervation to the serratus anterior muscle. The nerve that innervates this muscle is the long thoracic nerve.
What is latissimus dorsi innervated by?
thoracodorsal nerve
The thoracodorsal nerve, a branch of the posterior cord of the brachial plexus (C6 to C8 with C7 predominant) provides innervation to the latissimus dorsi. The nerve will travel in the neurovascular bundle with the thoracodorsal artery and its associated veins.
What nerve innervates the latissimus dorsi?
The thoracodorsal nerve is a pure motor nerve that innervates the latissimus dorsi muscle. The latissimus dorsi muscle is a large, fan-shaped muscle that originates from the spinous processes of T7 to L5, the thoracolumbar fascia, and iliac crest.
What does the lateral thoracic nerve innervate?
The lateral pectoral nerve mostly carries motor fibers. Its main function is to provide motor innervation primarily to the pectoralis major muscle, but also provides minor contributions to the pectoralis minor muscle.
What structures are affected by thoracic outlet syndrome?
Thoracic outlet syndrome (TOS) is a group of disorders that occur when blood vessels or nerves in the space between your collarbone and your first rib (thoracic outlet) are compressed. This can cause shoulder and neck pain and numbness in your fingers.
What muscles prevent scapular winging?
Scapular winging is almost always caused by damage to one of three nerves that control muscles in your arms, back, and neck:
- the long thoracic nerve, which controls the serratus anterior muscle.
- the dorsal scapular nerve, which controls the rhomboid muscles.
- the spinal accessory nerve, which controls the trapezius muscle.
What does the serratus anterior muscle do?
When the shoulder girdle is fixed, all three parts of the serratus anterior muscle work together to lift the ribs, assisting with respiration. The serratus anterior, also known as the “boxer’s muscle,” is largely responsible for the protraction of the scapula, a movement that occurs when throwing a punch.
What happens if thoracodorsal nerve is injured?
An intact thoracodorsal nerve may also cause atrophy of the muscle, which can lead to shoulder and arm weakness that hampers numerous common movements, including standing up from a chair.
What muscle is under the latissimus dorsi?
Triangles. The lateral margin of the latissimus dorsi is separated below from the obliquus externus abdominis by a small triangular interval, the lumbar triangle of Petit, the base of which is formed by the iliac crest, and its floor by the obliquus internus abdominis.