The left recurrent laryngeal nerve recurs around the
Left primary bronchus
left subclan aery
Left subclan vein
Ductus aeriosus
Early in embryological development, both the right and left recurrent laryngeal nerves hook (recur) around aoic arch 6. The left aoic arch 6 persists as the ductus aeriosus(distal pa) while proximal pa of it forms pulmonary aery. 6TH phyrangeal arch derivatives:- Nerve-reccurent laryngeal nerve Aery- pulmonary aery (and ductus aeriosus) Muscles - all muscles of larynx except cricothyroid.
CVS Embryology