During Dissection
क्या करे Formalin ki खुशबू की इतनी अजीब है आंख कान Etc Se Pani Nikal Aaye
Question -
What is The Action Of "Trapezius" Muscle??
Answers
Answer:
The trapezius muscle is a large superficial back muscle that resembles a trapezoid. It extends from the external protuberance of the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula. The trapezius has upper, middle, and lower groups of fibers.
The ventral rami of C3, C4 innervates the sensory function of the trapezius. Cranial nerve XI innervates the motor function of the trapezius.
The function of the trapezius is to stabilize and move the scapula. The upper fibers can elevate and upwardly rotate the scapula and extend the neck. The middle fibers adduct (retract) the scapula. The lower fibers depress and aid the upper fibers in upwardly rotating the scapula. These motions allow for the scapula to rotate against the levator scapulae and the rhomboid muscles. This rotation is important, in conjunction with the deltoid muscle, for throwing objects.
Unequal development of the three trapezius fibers causes muscle imbalances and posture disturbance can occur. Injury to cranial nerve XI can result in denervation and subsequent loss of motor function of the trapezius, resulting in muscle wasting. Cranial nerve XI can be examined during a clinical examination by asking the patient to shrug their shoulders passively, then actively against the examiner's resistance.
Answer:
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