An impression of having seen or experienced something before: Old-timers watched the stock-market crash with a distinct sense of dÃ©jÃ  vu. b. Dull familiarity; monotony: the dÃ©jÃ  vu of the tabloid headlines.
Lateral Neck Flexion Stretch. Lateral neck flexion stretch targets the upper trapezius muscle. This stretch can be very useful for people who suffer from tight, aching muscles in the upper back and neck, such as those who work at a computer.his stretch can be very useful for people who suffer from tight, aching muscles in the upper back and neck, such as those who work at a computer.
Splenius Capitus. The splenius capitus is a thick muscle that resembles a strap. It is located in the back of your neck. It begins at the base of your skull and ends at the top of your thoracic spine. This muscle allows for head extension, as well as lateral flexion and rotation of the cervical spine.ight muscles get worked during neck extensions. Photo Credit Jupiterimages/Goodshoot/Getty Images. Neck extensions are performed for a variety of reasons, including physical therapy after a neck or upper body injury, to relieve arthritis or joint pain, and as a strength building exercise.