What Is the Coracohumeral Ligament?

The brachiohumeral ligament is a strong fiber bundle attached to the joint capsule, which can be regarded as the free part of the pectoralis minor muscle, and 15% of the pectoralis minor stops are continuous with it. This ligament starts from the outer edge of the horizontal level of the coracoid process and passes between the superior and inferior superior scapula and subscapularis muscles, and its fibers reach the joint capsule and connect with the transverse humerus ligament between the large and small nodules. The colic-humeral ligament is similar to the suspended ligament of the humeral head. Its proximal fibers are tense during external rotation, which has the effect of restraining external rotation and prevents the humeral head from dislocating upward. In the periarthritis of the shoulder, the ligament is contracted, and the humeral head is in the internal rotation position, which limits the abduction and external rotation of the shoulder and humerus.

The brachiohumeral ligament is a strong fiber bundle attached to the joint capsule, which can be regarded as the free part of the pectoralis minor muscle, and 15% of the pectoralis minor stops are continuous with it. This ligament starts from the outer edge of the horizontal level of the coracoid process and passes between the superior and inferior superior scapula and subscapularis muscles, and its fibers reach the joint capsule and connect with the transverse humerus ligament between the large and small nodules. The colic-humeral ligament is similar to the suspended ligament of the humeral head. Its proximal fibers are tense during external rotation, which has the effect of restraining external rotation and prevents the humeral head from dislocating upward. In the periarthritis of the shoulder, the ligament is contracted, and the humeral head is in the internal rotation position, which limits the abduction and external rotation of the shoulder and humerus.

Chinese name

Rostral ligament

Foreign name

coracohumeral ligament

Department

Anatomy

Physiolocation of the beak-humeral ligament

From the lateral edge of the coracoid root, obliquely outward and downward, reaching the ligament in front of the greater tuberosity of the humerus, called the coracoid ligament. This ductile band is strong and strong. Its leading and upper edges are free. The trailing and inferior edges are healed to the joint capsule, separated from the joint capsule by a mucus sac. This ligament strengthens the upper part of the joint capsule, and has the effect of restricting the lateral rotation of the humerus and preventing the humeral head from dislocating upward.

Applied anatomy of the beak-humeral ligament

Beak-humeral ligament and its relationship with superior glenohumeral ligament

It has been reported through experiments that the CHL of the shoulder joint specimens are clearly visible and located in the rotator cuff space, which is an irregular oblique square structure. They all originated from the lateral margin of the base of the coracoid process. Some of them stopped at the superior ganglia tendon, some at the rotator cuff space, and some at the ganglia. The upper tendon and the subscapular tendon, and very few at the subscapular tendon. The pectoralis minor tendon moves across the tip of the coracoid process to CHL; see also that there is a fibrous tissue connection between CHL and the superior humerus.

Tension of beak-humeral ligament

CHL is tense during external rotation. Anterior flexion, extension, adduction, forward and backward translation, and relaxation in internal rotation, neutral position. External booth. The surface of CHL has no luster and there is no real bone-to-bone tension like the beak and shoulder ligament.

Observation and comparison of coraculohumeral ligament

Histological observation shows the fusion of the colic-humeral ligament and the joint capsule: the surface is covered with a single layer of flat epithelium, with collagen fibers and loose connective tissue below, and rich interstitial blood vessels. Capsule: the surface is covered with a single layer of cubic epithelium with loose collagen fibers below; the same specimen is the beak-shoulder ligament: no synovial epithelial cells, mainly composed of dense collagen fibers, with a small number of thin-walled capillaries seen in between.

in conclusion

Studies have shown that the starting and ending points of CHL are diverse. Neer et al.'S anatomy of 63 shoulder joint specimens showed that the starting points were at the lateral margin of the base of the coracoid process. The stopping points are diversified; 41 sides stop at the rotator cuff gap, and there is no clear bone attachment point; 14 sides stop at the supraspinalis tendon; Our anatomy of 20 shoulder specimens showed that CHL all originated from the lateral margin of the base of the coracoid process, consistent with Neer's description, except that there was 1 side of the subscapular tendon. The CHP was not seen across the tip of the coracoid process, which is inconsistent with Homsi et al. However, histological analysis showed that the homology of the CHL with the joint capsule indirectly indicates that it is not a continuum of the pectoralis minor tendon, however, it is not ruled out. The results of tendon bypassing the coracoid process to the joint capsule need further confirmation. The diversity of CHL stops brings certain difficulties to our examination, especially two-dimensional magnetic resonance. It is difficult to establish an oblique coronal scan method suitable for CHL for all people. However, since the starting point is the same, in the oblique sagittal scan, as long as the positioning line is aligned, you can basically scan. Ultrasound due to the movable probe, to a certain extent, the detection of CHL will be more common. But be careful to distinguish the pectoralis minor tendon stops and don't mistake this for thickened CHL.