The Shoulder joints complexity can be either a blessing or a trial. When all the many shoulder joint structures perform in harmony it translates to a first-class joint performance. Sadly each of these shoulder structures can injure and problems may arise, that cause pain and become disabling.

The Pectoralis minor muscle is a muscle of the shoulder complex that can become the sole reason for loss of function and pain. Pectoralis minor syndrome is a relatively uncommon condition, that is not wieldy known.

The Pectoralis major is the big muscle that is located at eh upper front of the chest. It’s a popular muscle to train by gym people and weight lifters.

The Pec minor is deeper and smaller than the pictorial major muscle. The pec minor muscle fibers, begin at the 3rd, 4th, and 5th ribs and the muscle sits obliquely out and up to form a tendonous attachment to the coracoid process of the shoulder blade.

Pectoralis-minorThe Pectoralis minor is innervated from nerve roots C8 and T1, by the medial pectoral nerve from the medial cord.

The contraction of the pec minor causes the shoulder blade to tilt as it is pulled down and forward, becoming slightly more parallel to the floor. When viewed from the back, the lower part of the blade the inferior angle tips out. And right below the pec minor are nerves and blood vessels that supply the arm, known as subclavian arteries and veins, and the accompanying nerves branches are called the brachial plexus.

In medical diagnosis, the word “syndrome” is used to group together a number of anomalies that occur together and win the same region. Because the pictorial minor connects the scapula to the chest and is in close proximity to the blood vessels and nerves.

Pectoralis minor syndrome consists of (1) Aberrant biomechanics of the shoulder blade and (2) Abnormalities of the blood vessels and nerves adjacent to the muscle. Some people suffering from pec minor syndrome will suffer from all possible abnormalities involving the nerve, blood vessels, and scapula, While other people will have fewer of the anatomical complaints and therefore fewer symptoms.

There are four reasons why the pec minor muscle will move the scapula in an abnormal way and compress on the adjacent vessels and nerves. (1) An injury had occurred to the pec minor muscle and during the healing process, the muscle developed scar tissue, inelasticity, and ultimately shortened. (2)A person was born with a congenitally abnormal pictorial muscle.(3) Athletes and certain jobs led to muscle hypertrophy and over time the muscle became bigger. (4)An unrelated condition has locked the shoulder blade in a down and forward position. As time passes the pec minor muscle chronically shortens the adjust to the new position of the scapula.

When the Pectoralis minor muscle is compromised, arm strength is decreased. In addition, breathing becomes more difficult and patients may fatigue quicker and respiratory muscles will become overworked and compromised.

  • Shortening of the Pec minor can impinge on the blood vessels and nerves resulting in shoulder impingement and thoracic outlet syndrome.
  • Shoulder joint flexion is diminished. Because scapular rotation is limited and it prevents the glenoid cavity from achieving the correct cranial orientation imperative for optimum flexion of the joint.
  • The pectoralis minor muscle compensates for other muscles. One such muscle is the serratus anterior. When this muscle is underachieved or inhibited the pec minor becomes overactive.
  • Factors that contribute to pec minor becoming tight and short are, glenohumeral joint dysfunction, a rounded shoulder posture, compensations, and breathing problems.
  • An under-active serratus anterior and overactive pec minor causes the scapula to the wing. Which is a major factor in the cause of arm pain.

The trigger points of the pec minor muscle are almost indistinguishable from that of the pec major muscle. They refer to pain strongly over the anterior deltoid region, cover the whole pectoral region. The pain may also extend down the ulna side of the arm, elbow forearm, and the palm of the hand.