What is the origin and insertion of trapezius?
Trapezius Attachments It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.
What is the action of the trapezius pars Spinalis?
|Artery||superficial branch of transverse cervical artery or superficial cervical artery|
|Nerve||accessory nerve (motor) cervical spinal nerves C3 and C4 (motor and sensation)|
|Actions||Rotation, retraction, elevation, and depression of scapula|
|Antagonist||serratus anterior muscle, Latissimus dorsi, Pectoralis Major|
What artery supplies the trapezius?
It was found that there are two main patterns of vascular supply to the trapezius, and that the muscle is principally supplied by three vascular sources: the transverse cervical artery, the dorsal scapular artery, and the posterior intercostal arterial branches.
Does the trapezius protract the scapula?
The trapezius elevates, depresses, and retracts the scapula. The descending muscle fibers of the trapezius muscle internally rotate the arms. The transverse muscle fibers retract the scapulae, and the ascending muscle fibers medially rotate the scapulae.
What does the trapezius attach to?
The muscle attaches to the medial third of superior nuchal line; external occipital protruberance, nuchal ligament, and spinous processes of C7 – T12 vertebrae.
What is the nerve supply of trapezius?
It is a large, strong muscle that is innervated by the accessory nerve (cranial nerve XI). In addition to its innervation from the accessory nerve, the trapezius muscle receives some proprioceptive fibers from the third and fourth cervical ventral rami.
Why do I get knots in my traps?
You may develop trigger points along the bands of the trapezius. These are raised parts of the muscle that can be painful. Trigger points can develop for many reasons, including from exercise, inactivity, or working for prolonged periods with a poor posture or with your head down.
Where is the suprascapular artery?
The suprascapular artery is a branch of the thyrocervical trunk, which emerges from the first part of the subclavian artery. It runs across the front of your neck and behind the clavicle (collarbone) to supply blood to the muscles, skin, and bones in your chest and shoulder.
Which muscles protract the scapula?
Protraction is accomplished by the actions of the serratus anterior, pectoralis major, and pectoralis minor muscles. Retraction is accomplished by the actions of the trapezius, rhomboids, and latissimus dorsi muscles. The elevation is accomplished by the trapezius, levator scapulae, and rhomboid muscles.
Where does the upper trapezius attach?
The trapezius muscle has several origin points along the midline of the posterior neck and back. The superior fibers attach on the medial third of the superior nuchal line and the external occipital protuberance of the occipital bone.
What causes tight trapezius muscles?
Which cranial nerve innervates the trapezius and sternocleidomastoid?
the XI nerve
The muscles innervated directly by the XI nerve are the trapezius and the sternocleidomastoid, in addition to the laryngeal musculature (in collaboration with the vagus nerve), such as the palatal, pharyngeal, laryngeal muscles.
Can the trapezius muscle cause chest pain?
TTP can occur in the back of the neck, along the tops of the shoulders, and in a few spots along the shoulder blades. You may experience trigger point pain in other muscles. For example, trigger points can also occur in the chest, the front of the neck, near the elbows, and near the fronts and backs of the knees.
Which muscle does the suprascapular artery supply?
The suprascapular artery supplies the supra- and infraspinatus muscles and travels with the suprascapular nerve.
Is there a major artery in your shoulder?
The brachial artery is the largest artery serving the shoulder and arm. It travels down the upper arm and through the elbow before dividing into the radial and ulnar arteries below the elbow. In the shoulder, branches of the brachial artery provide oxygenated blood to the muscles and bones.
What causes 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 …
What is the ascending part of the trapezius?
These fibers course superiorly and laterally towards their insertion point and hence, represent the ascending part of the trapezius. Along their course, all fibers of the trapezius converge laterally on the superior angle of the scapula to attach on their respective insertion points.
What is the relationship between the ascending aorta and the sternum?
Relations. The ascending aorta is covered at its commencement by the trunk of the pulmonary artery and the right auricula, and, higher up, is separated from the sternum by the pericardium, the right pleura, the anterior margin of the right lung, some loose areolar tissue, and the remains of the thymus; posteriorly,…
What artery supplies the trapezius muscle?
The arterial supply to trapezius varies depending on the level. The descending (upper) part of the muscle is supplied by transverse muscular branches arising from the occipital artery (branch of the external carotid), which passes along the deep surface of the muscle.
Where do the Inferior fibers of the trapezius arise?
The inferior or lower (or ascending) fibers of the trapezius arise from the spinous processes of the remaining thoracic vertebrae (T4–T12).