serratus anterior वाक्य
उदाहरण वाक्य
मोबाइल
- In the upper body the serratus anterior works eccentrically to prevent winging of the scapula.
- In addition, any condition causing weakness of the serratus anterior muscle may cause scapular " winging ".
- In cursorial animals, the thorax is hanging between the scapulae at the serratus anterior and pectoralis muscles.
- Functional demands have resulted in the evolution of individual muscles from the basal unit formed by the serratus anterior.
- Antagonists to this function ( upward rotators of the scapulae ) are the serratus anterior and lower fibers of the trapezius.
- The serratus anterior also plays an important role in the upward rotation of the scapula, such as when lifting a weight overhead.
- An abnormally protruding inferior angle of the scapula is known as a winged scapula and can be caused by paralysis of the serratus anterior muscle.
- If the lower fibers are inactive, the serratus anterior and upper trapezius work in tandem with rhomboids and levators to elevate the entire scapula.
- The upper and lower trapezius fibers also work in tandem with the serratus anterior to upwardly rotate the scapulae, such as during an overhead press.
- Therefore, in climbing animals, the serratus anterior supports the scapula against the reaction forces of the free limb and exerts high bending forces on the ribs.
- Secondary to serratus anterior palsy, a winged scapula is also caused by trapezius and rhomboid palsy involving the accessory nerve and the dorsal scapular nerve, respectively.
- Note that some muscles are not usually involved in these synergy patterns and include the lattisimus dorsi, teres major, serratus anterior, finger extensors, and ankle evertors.
- Though the most common causes of a winged scapula is due to serratus anterior palsy, and less commonly trapezius and rhomboid palsy, there are still other circumstances that present the ailment.
- A lesion of the nerve paralyses the serratus anterior to produce winged scapula, which is most prominent when the arm is lifted forward or when the patient pushes the outstretched arm against a wall.
- The chest wall has 10 layers, namely skin, superficial fascia, deep fascia, serratus anterior, layer for ribs ( containing intercostal muscles ), and endothoracic fascia from superficial to deep.
- The five superior serrations increase in size from above downward, and are received between corresponding processes of the serratus anterior muscle; the three lower ones diminish in size from above downward and receive between them corresponding processes from the latissimus dorsi.
- It originates from the axillary artery and follows the lower border of the Pectoralis minor muscle to the side of the chest, supplies the Serratus anterior muscle and the Pectoralis major muscle, and sends branches across the axilla to the axillary lymph nodes and Subscapularis muscle.
- The serratus anterior is occasionally called the " big swing muscle " or " boxer's muscle " because it is largely responsible for the protraction of the scapula that is, the pulling of the scapula forward and around the rib cage that occurs when someone throws a punch.
- The evolution of the serratus anterior itself has resulted in ( 1 ) grouping of its distal and proximal fibers, ( 2 ) size reduction of its intermediate fibers, and ( 3 ) the insertion of its dominant superior and inferior parts onto the superior and inferior angles of the scapula.
- In primitive life forms, the main function of the axioscapular group is to control the movements of the vertebral border of the scapula : fibers concerned with the dorsal movement of scapula evolved into the rhomboids, those with ventral motion into serratus anterior, and those with cranial movements into levator scapulae.
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