He is doing special exercises to train his serratus anterior muscle.

He exercises every day to strengthen his tibialis anterior muscle.

She was diagnosed with placenta previa.

The issue of the previa vessel is a very important issue in obstetrics.

A positive-semidefinite matrix is one of the important concepts in linear algebra.

He is known as an expert in subcritical nuclear experiments.

The anterior scalene muscle is part of the neck muscles and plays a role in assisting with respiration.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

Hoshoji Nyudo Zen Seki Hakutaijo Daijin is a courtesy title of Fujiwara no Tadamichi.