Spinal nerve nerve roots result in typical patterns of neurologic defects (muscle weakness, abnormal sensation, changes in reflexes) that allow localization of the responsible lesion. There are several procedures used in sacral nerve stimulation for the treatment of various related disorders. Sciatica is generally caused by the compression of lumbar nerves L4, or L5 or sacral nerves S1, S2, or S3, or by compression of the sciatic nerve itself. Spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal
Face and neck development of the human embryo three parts of the tongue. The surcus terminalis linguae is a V shaped line that separates the body of the tongue from the posterior part. The corresponding nerve for the three prominences of the anterior tongue is the trigeminal nerve. The posterior tongue is innervated by the glosopharyngeal nerve. The muscles of the tongue are innervated by the hypoglossal nerve. The thyroid appears as an epithelial proliferation in the pharynx floor between the copula linguae and the tuberculum impar. This point later will be the foramen cecum. Later, the thyroid descends in front of the pharyngeal gut when it already