Secondary tensor and supinator muscles of the human proximal radio-ulnar joint.
A gross anatomical study was made of the human elbow. Three very small muscles were found that are not described in contemporary anatomical publications. A lateral tensor muscle of the annular ligament was observed in seven of every ten cadavers; its action is to tense or pull the annular ligament laterally during supination. A medial tensor muscle of the annular ligament was found in two of every ten cadavers; its action is to tense the annular ligament, pulling it medially and distally, and to assist in supination. An accessory supinator muscle was found in four of ten cadavers; its action is to assist in supination. These muscles would be synergistic to the primary supinator muscles of the radio-ulnar joint.
Department of Otolaryngology, Northwestern University Medical School, Chicago, Illinois 60611.
M H
MH
Hast
R E
RE
Perkins
D004551:Elbow Joint / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D009132:Muscles / Q000033:anatomy & histology*