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%).
The spinal accessory nerve, or cranial nerve XI (eleven), is a purely motor nerve which innervates the trapezius and sternocleidomastoid muscles.The sternocleidomastoid muscles are used to turn the head.here are 12 cranial nerves, they are as followed; (I) Olfactory (II) Optic (III) Oculomotor (IV) Trochlear (V) Trigeminal (VI) Abducens (VII) Facial (VIII) Vestibulocochlear â¦ (IX) Glossopharyngeal (X) Vagus (XI) Accessory (XII) Hypoglossal. 2 people found this useful. Valentin Popov. 21,056 Contributions.