Spinal Movement: Anatomy - Dance Anatomy/Kinesiology Essay

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Anatomy: Dance Anatomy/Kinesiology -- Spinal Movement

Dance Anatomy -- the Spine

The Role of Gravity in Standing Movements of the Spine

Concept 3.1: Gravity plays a crucial role in muscle and spinal movements. It holds the spine in its precarious position when one is standing upright, and will also make it fall in the desired direction whenever there is movement. The role of gravity in three common movements has been discussed in the subsequent sections.

Gravity and Forward Flexion

Explain the muscle contraction you are feeling, and how abdominal and spinal sensors operate in this movement

Spinal flexion occurs when the sagittal plane is bent forward, bringing together the anterior surfaces of the trunk and the vertebrae (XXX 108). A perfect example of a forward flexion is when someone places one hand on the abdomen and the other on the lumbar spine, and then rolls down slowly towards the floor (XXX 110). The tension felt in the muscles in this case is a direct action of gravity -- the pelvis tilts against the force of gravity acting on the spine, and this causes the left and right external obliques and the rectus obdiminis to all work together against the action of gravity to control the spinal flexion, as the transverse abdominis pulls the wall of the abdomen inward (XXX 108). The tension results from the opposing action of all these forces.

ii) Gravity and Spinal Extension

Explain the influence of gravity with this movement and how it affects muscle useDownload full Download Microsoft Word File
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TOPIC: Essay on Spinal Movement: Anatomy - Dance Anatomy/Kinesiology Assignment

Spinal extension is the process by which the sagittal plane returns to a position of backward bending from a position of flexion (XXX 109). Concentrically, the spinal movement is against gravitational action; and since the force of gravity is considerably strong, the spinal extensors as well as the deep posterior and the semispinalis muscle groups move in to facilitate extension by acting against gravity. They work in different ways - the spinal extensors, particularly the erector spinae, provide the force necessary to drive the full extension of the spine, whereas the deep posterior group act by adjusting inter-vertebrae motion, thereby stabilizing the spine (XXX 109). The spinal extensors will, in essence, work concentrically in seeking to restore the torso back to a position of backward bending after a spinal flexion (XXX 110). In cases, however, where there is a hyperextension of the spine, the spinal extensors will work eccentrically (in the same direction as gravity) to restore the torso back to a vertical position

iii) Spinal Lateral Flexion

Spinal lateral flexion occurs when the frontal plane is moved to the side (XXX 110). It can either be left lateral flexion or right lateral flexion, depending on the direction to which the upper spine bends relative to the lower part (XXX 110). Left lateral flexion occurs when the surfaces on the left side of the vertebrae are approximated, and vice versa. Conversely, left lateral flexion can be said to occur when the spine is returned to anatomical position from a position of right lateral flexion (XXX 111). In the down phase of the spinal lateral flexion, the lateral flexors work eccentrically (in the same direction as gravity). We can use the example of a right lateral flexion to illustrate the eccentric action of the lateral flexors in the down phase of this movement -- the right lateral flexors initiate the bending of the torso to the right, and once the spine is off-center, the left lateral flexors will work together with gravity to control the movement (XXX 111). The specific flexor movements will… [END OF PREVIEW] . . . READ MORE

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