inferior deep cervical lymph nodes inferior deep cervical lymph nodes the inferior deep cervical lymph nodes extend beyond the posterior margin of the sternocleidomastoid muscle into the subclavian triangle, where they are closely related to the brachial plexus and subclavian vein. inferior deep cervical lymph nodessuperficial lymph glands and lymphatic vessels of head and neck. (inferior deep cervical glands labeled at bottom right.)detailssystemlymphatic systemsourcesuperior deep cervical lymph nodesdrains tojugular trunkidentifierslatinnodi lymphoidei cervicales laterales profundi inferioresanatomical terminology