한국인태아 견관절발육에 관한 연구

Abstract

The developmental feature of the shoulder joint in the middle and later stages of the fetal period has been studied by means of morphological measurements on the various constituents of the right shoulder joint , such as; articular capsule , articular fossa, glenoidal labrum, proximal part of the long head of the biceps brachii muscle , glenoid fossa of the scapula, and the upper end of the humerus. The materials used for present observation are 365 cases including 181 cases of male and 184 cases of female of the Korean fetuses aged from the 4th month to the 10th month. 1. The longest measurement has been made on the posterior part of the joint capsule , while the shortest one on the anterior part of the joint capsule. An equal lengths have been measured on the upper and lower surfaces of the capsule. A relatively rapid lengthening is detected on the anterior part of the capsule, is followed by those on posterior part, lower part, and upper part, successively, with gradual decrease of the velocity of the growth with the time. The range of the growth of the upper part is comparable to that of the body length. 2. Twice of value has been measured on the width of the proximal tendon of the long head of the biceps in comparison with that of the thickness of the biceps. The growth on the thickness is more rapid than that of the width. 3. The supero-inferior diameter of the articular fossa of the joint is longer than the transverse diameter of it. The width-height index at the 4th month is about 72( %), and is comparable to that of the adult. A relatively broad and shallow articular fossa in the middle fetal stage is gradually replaced to the relatively narrow and deep one with the time. 4. Of the glenoidal labrum well developed upper paπ is observable in comparison with those of the remainder parts. 5. Of the glenoid fossa the supero-inferior diameter is shown a relatively rapid increase, whereas, the slow one for the transverse diameter of it. 6. Of the head and anatomical neck of the humerus the supero-inferior diameter is shown by a relatively rapid multiplication with the time , while , the relatively slow one for the antero-posterior diameter. 7. On the growths of most of the items a relatively rapid increase is observed until the 6th month, and is followed by a relatively slow one thereafter. 8. The proportions of the several mean values from the 10th fetal month over those of the adult are distributed within 24. 0-26. 6% in male and 28. 8 -31.6% in female for the glenoid fossa of the scapula, and 37.9-38.8% in male and 42.3-44. 2% in female for the upper end of the humerus. 9. Significant difference has not been found between the male and female sexes.