Fan-Shaped Muscle Lateral to the Thorax

This page is the CodyCross answer for the clue below from Working From Home, Group 1227, Puzzle 4 (Shredder and Scanner).

Question is: Fan-Shaped Muscle Lateral to the Thorax

and the answer is: SERRATUS

Word Meaning:

SERRATUS — (anatomy) Any of several muscles of the vertebral or costal region that produce a serrated border.

Definitions from Wiktionary.