GROSS ANATOMY

Detailed explanation-1: -The pectoral branch of the thoracoacromial artery provides the main vascular supply to the PM muscle once elevated (see Fig. 68-1). The pectoral branch of the artery courses obliquely and parallel to a line between the acromion process and xiphoid process.

Detailed explanation-2: -Supply. Through its four main branches, the thoracoacromial artery contributes arterial supply to the pectoralis major and minor muscles, the anterior part of the deltoid muscle, and the clavipectoral fascia 2.

Detailed explanation-3: -The acromial branch runs lateralward over the coracoid process and under the Deltoideus, to which it gives branches; it then pierces that muscle and ends on the acromion in an arterial network formed by branches from the transverse scapular, thoracoacromial, and posterior humeral circumflex arteries.