Tetany means sustained abnormal muscle contractions. Hypertonia refers to excess muscle tone.
rigormortis
Rigid is the medical term meaning board-like.
Diastasis
Visceral muscles
Tetany is the medical term meaning inability to relax the muscles.
Costochondritis is inflammation of the muscles in the ribs
Colic is the medical term meaning spasm of the visceral muscles.
intercostal muscles - from inter meaning 'between', and costa meaning 'rib'
Myologist is the term meaning specialist in the study of muscles, but an orthopedist is the typical specialist physician who treats muscle problems.
Tetany is the medical term continuous spasm of muscles; tetany may result from hypocalcemia.
Contracture or contraction
Capsulitis