Antrochoanal polyps arise from the maxillary sinuses and are the much less common; ethmoidal polyps arise from the ethmoidal sinuses. Symptoms of polyps include nasal congestion, sinusitis, anosmia (loss of smell), and secondary infection leading to headache.
Relationship of internal jugular vein to the spinal accessory nerve (SAN). Spinal accessory nerve (SAN) posterior to the internal jugular vein. As the nerve approaches the sternocleidomastoid muscle (SCM), it may perforate the cleidomastoid portion of the SCM (80%) or run posterior to it (20%).
Motor nerves. Motor nerves (motor neurons) pass information received from your brain through your spinal tracts to your skeletal muscles to direct precise voluntary movements. Spinal nerves are linked to specific muscles: 1  Cervical spinal nerves supply the muscles of your neck, shoulders, arms and hands, and diaphragm. 2  Thoracic spinal nerves supply your truck muscles and muscles involved with breathing. 3  Lumbar and sacral spinal nerves supply your hip, leg and foot muscles.