The muscle that retracts and elevates the upper lip is the ZYGOMATICUS MINOR muscle.
- The zygomaticus minor, often also known as the 'zygomatic head', is a muscle that originates from the zygomatic bone and is involved in facial expression.
- This muscle (zygomaticus minor) is innervated by zygomatic and buccal branches of the facial nerve.
- The zygomaticus minor is located anterior towards the zygomaticus major muscle and below the orbicularis oculi muscle.
In conclusion, the muscle that retracts and elevates the upper lip is the ZYGOMATICUS MINOR muscle.
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