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%).
IV. Spinal nerves: somatic components. For the somatic portion of the nervous system (the portion dealing with body parts other than viscera, vascular smooth muscle, and glands) there are two major types of nerve cells which connect the spinal cord to the periphery.V. Spinal nerves: somatic components. For the somatic portion of the nervous system (the portion dealing with body parts other than viscera, vascular smooth muscle, and glands) there are two major types of nerve cells which connect the spinal cord to the periphery.