Nodding of I he head occurs at the atlanto-occipital joint, rotational ncck movements mainly at the atlantoaxial joint, whilst flexion, extension and lateral flexion occur mainly at the mid-cervical level.
The neural canal is almost filled by the cervical enlargement of the spinal cord and the emerging cervical roots pass through exit foraminae bounded by the facet joints posteriorly and the intervertebral discs and neurocentral joints anteriorly. The nerve roots, particularly in the lower cervical spine, may be compressed or irritated by lateral disc prolapse or osteophytes arising from the facet or neurocentral joints, A central disc prolapse may produce pressure on the cord itself.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.