Location: in the shallow layer of the anterior upper part of the chest. It is divided into clavicle (upper bundle), rib chest (middle bundle) and abdomen (lower bundle).
Starting point:
The clavicle starts from the medial half of the clavicle,
The pectoral costal region originates from the anterior sternum and 1~6 costal cartilage.
The abdomen originated from the anterior layer of rectus abdominis sheath.
Stop point: the crest of greater tubercle of humerus, clavicle and abdominal muscle bundle cross up and down (which is beneficial to shoulder flexion and internal transceiver)
Function:
Tightly fixed, so that the upper arm flexes, adducts and rotates in the shoulder joint.
Far fixation, when the upper arm is lifted and fixed, you can pull the trunk closer to the upper arm (pull-ups) and lift the ribs to help inhale.
The antagonistic muscle is rhomboid muscle.
Effect of 1 on bone posture
(1) affects breast health. When nodules, masses and breast cancer appear, the corresponding muscle regions are: A→ sternocleidomastoid muscle, B→ pectoralis minor muscle, C→ rectus abdominis muscle and D→ serratus anterior muscle. Upper part → pectoralis major, lower part → abdomen. Lateral → pectoralis minor, serratus anterior, medial → pectoralis major, rectus abdominis and sternocleidomastoid muscle. Breast health is related to the corresponding muscle blood supply.
② It is related to breast morphology, because the development of muscles around the chest directly affects the morphology and provides breast nutrition supply. (Prevent sagging breasts)
③ The capillaries of lymph and blood circulation system pass through rectus abdominis and other muscles, and their fascia is connected. If the muscles get stuck, there will be chest problems.
④ The pectoralis major muscles are tense, the shoulders are pronated, the shoulders are hunched, and the head is forward, resulting in poor breathing. Therefore, the open-shouldered thoracotomy in stretching refers to stretching the fascia of pectoralis major and rectus abdominis, rather than opening the thoracic vertebra and moving it forward.
When weak, the ability to maintain the function of chest bending and arm becomes weak.
Buckle your shoulders when you are overdeveloped.
2 Relationship with fitness
Keeping the chest bent is of great significance for supporting movements. Forward (adduction) of the arm is the best action of pectoralis major.
Training pectoralis major: mainly adduction movements (flying birds, bench press, etc. ), upper chest lifting (upward oblique bench press, gantry oblique bird, etc.). ), lower chest compression (downward oblique bench press, flat push-ups, etc. ).
Stretching pectoralis major: the act of opening the chest, arms abduction.
The fascia of pectoralis major, rectus abdominis, serratus anterior, medial and lateral oblique abdominis, platysma cervicalis and sternocleidomastoid are all connected, among which pectoralis major has the greatest strength.
Effect of 3 on respiratory emotion of organs
Affect breast health
Tight shoulder buckles lead to poor breathing.
4 pain analysis and principle
No matter what we do, we are in front of our bodies, such as working, studying and playing with mobile phones. Therefore, pectoralis major exercises regularly, has good blood circulation and generally has no pain.
If it is too tight, the arm will rotate inward and the lifting will be limited.
musculus pectoralis minor
Location: Deep side of pectoralis major.
Starting point: before the 3rd to 5th ribs.
Stop point: coracoid process of scapula
Function:
Proximal fixation: pull the scapula forward, downward and downward.
Long-distance fixation: lifting ribs to help inhale (shrug and breathing compensation)
Effect of 1 on bone posture
The pectoralis minor muscles on both sides are tense, the shoulder blades on both sides are pulled forward, away from each other, the shoulders are bent and hunched, and the back hurts. Always stretch the pectoralis minor muscle. When nervous, pull the coracoid process of the scapula forward and downward, so that the lower corner of the scapula is upturned (wing scapula)
Tension of pectoralis minor leads to cervical spondylosis in front of the head.
Nerves, blood vessels and lymph pass through and affect the breast.
Effect of 2 on respiratory emotion of organs
Affect the breast
When the diaphragm function is weak, pectoralis minor lifts its ribs to help inhale, resulting in shrugging and breathing.
Emotional muscles. Mental stress. Anxiety, tension in pectoralis minor. When defending and protecting, when lacking self-confidence and fear, you will hold your chest out.
3 pain analysis and principle
It is easy to get nervous and get old, which affects hunchback, shoulder, arm, cervical pain, wing scapula (the lower corner is upturned).
When the shoulder is buckled, the arm lift is limited, and the head is led forward and needs to be released.
Lateral thoracic nerve runs between pectoralis major and pectoralis minor, which affects the health of chest and breast after compression.
Pressing the brachial plexus when nervous leads to arm numbness.
supplement
1 male nipple flat fourth rib
People with hunchbacks should stretch pectoralis major and pectoralis minor.
Causes of nodules: ① After long-term excessive elongation of muscle fibers, the fibers will automatically stick together to obtain better contraction protection. ② Long-term muscle extrusion adhesion ③ After fiber injury and fracture, the connection adhesion is restored.
The pterygoid scapula is related to the weakness of serratus anterior muscle and rhomboid muscle and the tension of pectoralis minor muscle.
Causes of pain in sternal stalk area: excessive thoracotomy, fascial tension, and anterior tension pain caused by posterior thoracic vertebra pushing forward.
6 breast health, reduce hyperplasia. The strength of pectoralis major is strengthened, and the space between pectoralis major and pectoralis minor is enlarged by stretching.