internal rotation
This is called an inversion.
The medical term for turning inward of the edge of an eyelid is "entropion." This condition can cause discomfort, irritation, and potential damage to the cornea due to the eyelashes rubbing against it. Treatment may involve surgery to correct the positioning of the eyelid.
The medical term for excessive turning is "hyperkinesis." It refers to abnormal or excessive involuntary movements or muscle activity.
Articulation is the medical term meaning joint. The medical terminology combining form meaning joint is arthro-.
Arthrocentesis is the medical term meaning aspiration of fluid from a joint.
The popliteus
Flexing is the medical term meaning decreasing an angle as in bending a joint.
A joint prosthesis is an artificial joint.
Knee arthroscopy is the medical term meaning visual examination of the inside of the knee joint.
Tumor = oma Joint = arthro
Joint effusion
arthrogram
In medical terms, flexion means decreasing the angle of a joint.