Final answer:
The PICA irrigates the inferior cerebellum, including the inferior cerebellar peduncle. The vagus nerve may be affected if the PICA is compromised.
Step-by-step explanation:
The posterior inferior cerebellar artery (PICA) provides blood supply to the inferior cerebellum, including the inferior cerebellar peduncle (ICP).
The cranial nerve (CN) that can be affected if the PICA is compromised is the CN X, also known as the vagus nerve. This is because the vagus nerve passes through the medulla where the PICA is located.
Keywords: posterior inferior cerebellar artery, PICA, inferior cerebellar peduncle, cranial nerve, CN, vagus nerve, medulla