Triceps brachii muscle demonstrating a fourth head.
Variations of the triceps brachii muscle are apparently rare. We report an additional attachment site of the medial head of the triceps brachii found on the left side of a male cadaver. This head originated from the posterior aspect of the surgical neck of the humerus. Clinicians diagnosing or treating patients with weakness or pain of the posterior arm should consider anomalous muscles in this region that may result in neurovascular compression.
Section of Pediatric Neurosurgery, University of Alabama at Birmingham and Children's Hospital Birmingham, Alabama 35233, USA. rstubbs@uab.edu
R Shane
RS
Tubbs
E George
EG
Salter
W Jerry
WJ
Oakes
D000368:Aged; D001132:Arm / Q000002:abnormalities*; D002102:Cadaver; D014644:Genetic Variation; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000002:abnormalities*; D011826:Radial Nerve / Q000033:anatomy & histology; D013710:Tendons / Q000002:abnormalities