摘要
根据人三角肌的肌纤维起止、排列和神经支配特征,将该肌分为前、中、后3个亚部。用新鲜男性尸体标本16侧三角肌,按上述3个亚部的浅、深区分别取材,作恒冷箱冰冻横向切片,肌球蛋白ATP酶染色,将肌纤维分为Ⅰ型和Ⅱ型。检测各区的肌纤维型构成比例,并用图像分析仪测量各区两型肌纤维的横切面积和直径。结果发现,肌中部的I型纤维比例明显高于前、后两部,各亚部深区的I型纤维比例均比浅区高,而左、右侧之间无差异。各亚部及浅、深区。Ⅰ、Ⅱ型肌纤维的直径都相似(57～6lμm),仅中部深区Ⅱ型纤维直径(52.9μm)较其他各区肌纤维明显细小;除中部深区外,右侧两型纤维的直径均比左侧稍大,但统计学分析左右侧差异不显著。作者认为,三角肌纤维型分布的肌内差异,与该肌功能的分化密切相关。中部深区的Ⅰ型纤维比例较高,Ⅱ型纤维直径较细,可能提示该区的主要功能是维持肩关节稳定。
The deltoid muscles on both sides of 8 male cadavers were studied within 24 hours after death. According to its fiber architecture, origins and insertions, and nerve distribution, the deltoid muscle was divided into three compartments: an anterior, a middle and a posterior. The muscle samples were taken respectively from the superficial and the deep portion of each compartment of the deltoid muscle. Frozen transverse sections were stained fer myosin ATPase. Muscle fibers were identified as type Ⅰ and type Ⅱ. The proportion of fiber types in each portion was calculated on microscopic photographs and mean cross-sectional areas of both fiber types were measured by imaging analytical system. The results showed that the proportion of type Ⅰ fiber in the superficial and deep portion of the middle compartment is significantly higher than that of the corresponding portion of the anterior and posterior compartments, and the proportion in the deep portion of each compartment is higher than that of the superficial one, however no difference was found between the left and right sides. The fiber size among all portions is not obviously different, but the diameter of type Ⅱ fiber in the deep portion of the middle compartment is significantly smaller than that of other portions. Except the deep portion of the middle compartment, the diameter of both fiber types of the right muscle is larger than those of the left one, although statistical analysis showed that the difference is not significant. The authors suggest that the difference of fiber type distribution within the deltoid muscle is closely related with the functional differentiation of the muscle and the characteristic higher typeⅠ fiber proportion and smaller type Ⅱ fiber diamiter in the deep portion of the middle compartment probably indicate that the main function of this portion is to keep the shoulder joint stability.
出处
《解剖学报》
CAS
CSCD
北大核心
1992年第1期1-6,共6页
Acta Anatomica Sinica
基金
国家自然科学基金
关键词
三角肌
亚部化
肌纤维型
Human deltoid muscle
Compartmentalization
Muscle fiber type and distribution
Myosin ATPase
