[An abnormal course of the Th1-root of the brachial plexus in connection with a variety of the anterior scalenus muscle].
A scalenus anterior muscle with 2 insertions was found - one insertion at the Tuberculum m. scaleni anterioris, the other at the osteo-cartilaginous border of the 1st rib. In the thus formed opening, limited by the 2 insertions and the 1st rib, the Th1-root of the brachial plexus emerged. Its other roots passed between the scalenus anterior and medius muscles as usual. An aponeurotic membrane, attached to the inner margin of the 1st rib and narrowing the upper thoracic aperture prevented the Th1-root from crossing over the 1st rib behind the Tuberculum m. scaleni anterioris as it normally does.
Fuss
F K
FK
I. Anatomische Lehrkanzel, Universität Wien, Osterreich.
Kager
L H
LH
Mottl
W
W
Weber
M H
MH
D001917:Brachial Plexus / Q000002:abnormalities*; D005260:Female; D006801:Humans; D009132:Muscles / Q000294:innervation*
Ein abnormer Verlauf der Th1-Wurzel des Plexus Brachialis in Zusammenhang mit einer Varietät des Musculus Scalenus Anterior.