01 / Location & anatomical relationships
Around the upper and lower edges of your mouth.
02 / Structure & organization
The lips contain orbicularis oris and other interlacing facial muscle fibers. The external skin transitions through the vermilion to moist oral mucosa. A dense sensory supply supports precise contact detection and coordinated movements.
03 / Function
They help you form words and keep food in your mouth.
04 / Mechanism
Lips contain muscle covered by sensitive tissue. They close to hold a sip of water and change shape to produce speech sounds. Sounds such as p and b begin with the lips together.
Part of a bigger picture
The lip belongs in our head & face collection. Explore the nearby parts to see how this area of the body fits together.
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Connect structure with function
Lip closure is important for swallowing and speech. The orbicularis oris acts with neighboring facial muscles rather than functioning as an isolated circular ring.
Check your understanding
Locate the lip in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.