In preparation for dissection of the shoulder posteriorly, you may want to
review the muscles (video)
from the dissection of the back.
This dissection demonstrates the triangular and
quadrilateral spaces. The deltoid is partially reflected exposing the axillary
nerve and posterior humeral circumflex artery which supply the muscle and
pass through the quadrilateral space. Other muscles seen are the long head of the
triceps, teres major m., and teres minor m.. Part of the circumflex
scapular artery is seen passing through the triangular space.
This video demonstrates the circumflex scapular
artery passing through the triangular space and the axillary
nerve and posterior humeral circumflex artery passing through the quadrangular
space.
