Persistent Embryological Connections

Q: What are the persistent connections between the anterior and posterior circulation.

A: mnemonic HOT

   Hypoglossal (featured on EOF sample questions)  

   Otic

   Trigeminal SL Case (the one you most commonly see in practice)  

   extra credit for proatlantal occipital I & II

Q: What is a practical implication of a persistent trigeminal (or hypoglossal artery)

A: When performing a Wada test, if this connection exists, the sodium amytal would anesthetize the pons, potentially requiring emergency intubation.