title: Fetal biceps and deltoid muscle flexing in utero at 21 weeks gestation.
authors.forename: D M
authors.initials: DM
authors.lastname: Sherer
authors.forename: P C
authors.initials: PC
authors.lastname: Eggers
authors.forename: J S
authors.initials: JS
authors.lastname: Abramowicz
mesh_terms: D005260:Female; D005542:Forearm / Q000000981:diagnostic imaging* / Q000502:physiology; D005865:Gestational Age; D006801:Humans; D009132:Muscles / Q000000981:diagnostic imaging* / Q000502:physiology; D011247:Pregnancy; D012026:Reflex, Stretch; D016216:Ultrasonography, Prenatal