This book explains in detail about the use of foreign words.

This sentence contains non-Jōyō kanji.

This sentence contains kanji not approved for regular use.

He started exercises to strengthen his abductors.

He is doing special exercises to strengthen his supinator.

He underwent surgery on his extraocular muscle.

He is doing special exercises to strengthen his external obturator muscle.

The external intercostal muscle plays an important role in respiration.

The external anal sphincter plays a crucial role in helping us control defecation.

The external urethral sphincter is an important muscle for controlling the excretion of urine.