Anatomy
Origin:
Maxilla inferior to the infra-orbital foramen.
Insertion:
Skin at the corner of the mouth.
Key Relations:
Lies posterior to levator labii superioris, levator labii superioris alaeque nasi and zygomaticus major and minor.
Functions
Raises corner of the mouth and forms the nasolabial furrow e.g. during sadness..
Supply
Nerve Supply:
Buccal branch of the facial nerve (CN 7).
Blood Supply:
Superior labial branch of the facial artery.
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