What are some nine-letter muscles?

12 of the 85 muscles in Icillion have exactly 9 letters, for example Trapezius, Diaphragm and Sartorius.

Which nine-letter muscles start with P?

P is the most common first letter here, with 3 names, such as Plantaris, Popliteus and Pterygoid.

Science · lists

12 nine-letter muscles in alphabetical order, from “Cremaster” to “Trapezius”. Each one counts as an answer in Icillion.

12 of the 85 muscles have exactly 9 letters (14%).
Most start with P (3), S (3) and C (1).
Only names of one word are counted, and only their letters: spaces, hyphens and apostrophes are not.

What are some nine-letter muscles?: 12 of the 85 muscles in Icillion have exactly 9 letters, for example Trapezius, Diaphragm and Sartorius.
Which nine-letter muscles start with P?: P is the most common first letter here, with 3 names, such as Plantaris, Popliteus and Pterygoid.

How deep does your knowledge go?

Seven prompts a day, twenty seconds each. Obvious answers float on the tip of the iceberg; rare ones sink all the way to the trench.