01/31/2024
Day 30!! 3000 push-ups!
The trapezius muscle…..
The trapezius muscle is a large, paired, flat, superficial muscle of the upper back and neck composed of three sets of fibers. Its job is to move the shoulder blades by way of elevation, rotation, and adduction according to the controlling fiber type. It is innervated by the cranial accessory nerve (CN XI) for motor functions; sensory innervation is provided by the spinal nerves at cervical vertebrae three and four. It plays an important role in posture, side bending, turning the head, lifting and dropping the shoulders, and rotating the arm internally.
