Rahman H A, Yamadori T
First Department of Anatomy, Kobe University School of Medicine, Japan.
Acta Anat (Basel). 1994;150(2):156-8. doi: 10.1159/000313645.
In a Japanese female cadaver, the occipital portion of the trapezius muscle (the cleido-occipitalis) was separated from the rest of the muscle by a triangular gap that resulted from a deficiency of the upper two thirds of the cervical portion on both sides. The right cleido-occipitals blended distally with the cervical fibers of the trapezius and had a normal insertion into the clavicle. The left cleido-occipitalis intermingled partially with the reduced cervical portion, and some of the conjoint fibers formed an independent accessory slip whose tendon inserted into the posterior aspect of the junction of the middle and medial thirds of the clavicle. The other conjoint fibers inserted into the clavicle and scapula as usual. This anomalous morphology may be attributed to a secondary degeneration of a portion of the trapezius anlage concomitant with an abnormal segregation of another portion during development.
在一具日本女性尸体中，斜方肌的枕部（锁枕肌）通过一个三角形间隙与其余部分肌肉分离，该间隙是由于两侧颈部上三分之二部分发育不全所致。右侧锁枕肌在远端与斜方肌的颈部纤维融合，并正常插入锁骨。左侧锁枕肌部分与缩小的颈部部分相互交织，一些联合纤维形成了一条独立的副肌束，其肌腱插入锁骨中内三分之一交界处的后方。其他联合纤维则如常插入锁骨和肩胛骨。这种异常形态可能归因于斜方肌原基的一部分在发育过程中发生继发性退变，同时另一部分出现异常分离。
