Wht is trapezius muscle?
Trapezius Muscle Introduction The trapezius muscle is a broad, flat, superficial muscle located in the upper back and neck region. It plays a crucial role in various shoulder and neck movements, including shrugging, rotating, and retracting the scapula . Often overlooked in routine assessments, the trapezius is vital not only for postural stability but also for functional activities involving the upper limb. Due to its extensive anatomical span and complex fiber orientation, this muscle requires a nuanced understanding for effective clinical assessment and rehabilitation. Anatomy of Trapezius Muscle Origin External occipital protuberance Medial third of the superior nuchal line of the occipital bone Ligamentum nuchae Spinous processes of C7 to T12 vertebrae Insertion Lateral third of the clavicle Acromion process Spine of the scapula Nerve Supply Motor innervation : Spinal accessory nerve (cranial nerve XI) Sensory innervation : Ventral rami of C3 and C4 ...