The Muscles That Make a Lip and Palate Work
Anatomical domain · Lesson 2 of 20 · Human Body Systems (HBS)
Today's goal: Describe the orbicularis oris as a ring that seals the lips and the levator veli palatini as a sling that lifts the soft palate, and explain why fiber direction and continuity matter.
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
Orbicularis oris (lips, top-down): arrows form an unbroken ring that crosses the upper-lip midline. Job: seal and purse the lips. If interrupted at the midline, the lips cannot seal, so suction and p/b/m sounds fail.
Levator veli palatini (soft palate, from below): paired arrows sweep toward the midline and join, running side to side across the velum (a transverse sling). Job: lift the soft palate up and back to seal the velopharynx. If the fibers ran front to back, the muscle could not lift the palate to the throat wall, so the nose would not seal.
This model shows the level of evidence and organization needed to complete: Labeled arrows showing normal fiber direction for both muscles, with a function note.
- Name the variables and include units.
- Enter observations without changing the raw values.
- Check labels, calculations, and patterns before interpreting the data.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: How does the cord direction control the motion?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: On a top-down view of the lips and a from-below view of the soft , draw with colored arrows the normal fiber direction of the and the . For each muscle, write one sentence: what job it does and what would break if it were interrupted.
- 5Check it against the rubric, then submit.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in through the route named under Submit here and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
- CompleteProficient: Nothing is left blank: the model fills every part of "On a top-down view of the lips and a from-below view of the soft palate, draw with colored arrows the normal fiber direction of the orbicularis oris and the levator veli palatini. For each muscle, write one sentence: what job it does and what would break if it were interrupted.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be attached to your class form or handed in, and confirmed.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Relating muscle fiber direction to the job the muscle performs.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.