Final answer:
To observe changes in the ligamentum nuchae tension, passive movements such as flexion, extension, lateral flexion, and rotation of the neck should be performed. These movements are governed by the sternocleidomastoid and trapezius muscles. Asymmetry during these movements may indicate muscle or nerve issues.
Step-by-step explanation:
Understanding Ligamentum Nuchae Tension
To feel the ligamentum nuchae change tension underneath the fingers, passive movements such as flexion and extension of the head can be performed. When the neck muscles, specifically the sternocleidomastoid and the trapezius, contract bilaterally during these movements, you can feel the tension changes.
These muscles are controlled by the accessory nerve, and testing their function through flexing and strength exams also checks nerve function. To feel the ligamentum nuchae, place your fingers on the back of your neck and gently flex the head forward and then extend it backward. You should feel a difference in tension as the ligamentum nuchae supports the extended head.
Additionally, lateral flexion and rotation of the neck facilitated by the same muscles can also alter the tension in the ligamentum nuchae, as the ligament assists in maintaining the head's balance and position. Any asymmetry felt during these movements can indicate potential damage or weakness on one side of the neck muscles or accessory nerve deficits.