Â© 2000 John Wiley & Sons, Inc. An inverse relationship between household income and violence exposure in youth hasbeen reported in numerous studies (e.g., Garbarino & Crouter, 1978; Gelles, 1992; Gelles& Straus, 1979; Steinberg, Catalano, & Dooley, 1981).
The head, attached to the top of the vertebral column, is balanced, moved, and rotated by the neck muscles (). When these muscles act unilaterally, the head rotates. When they contract bilaterally, the head flexes or extends. The major muscle that laterally flexes and rotates the head is the sternocleidomastoid.
The Deep Neck Flexors What are the deep neck flexor muscles? The deep neck flexors are a group of muscles that are responsible for forward bending and side-bending of the neck.These muscles are also very important for supporting the weight of the head against gravity and stabilizing the neck during various body movements.eep Neck Flexor Exercises. The deep neck flexors can be activated by a simple nodding movement of the head on the neck called a chin-tuck. The tucking the chin activates the deep flexor muscles and moves the chin closer to the âAdamâs appleâ (Thyroid cartilage).