Functional diagram of the larynx
There are a few non-standard labels in this diagram, relative to the
speech literature at least:
It should also be noted that the crico-arytenoid "joint" is NOT, as depicted
here, implemented as a pin or axle.
what is labelled the arytenoid muscle is generally called the inter-arytenoid
what is labelled the crico-arytenoid muscle is generally called
the posterior crico-arytenoid (PCA) muscle, to distinguish it from
the lateral crico-arytenoid (LCA) muscle
what is labelled the vocal muscle is generally called the vocalis
muscle, and is part of the thyro-arytenoid muscle.
This diagram omits some extrinsic laryngeal muscles that may play a
role in pitch and phonation control, namely the genio-hyoid and
the muscles collectively known as the strap muscles, that is the
sterno-thyroid and sterno-hyoid muscles.