Abe S, Orihara K, Kitamura S, Takizawa M, Okada M, Ide Y
Department of Anatomy, Tokyo Dental College, Chiba, Japan.
Bull Tokyo Dent Coll. 1997 Aug;38(3):217-21.
We precisely examined the origin, attachment, manner and insertion of the medial pterygoid muscle to clarify the relationship between muscle morphology and mastication movement. The muscular bundle attachment of the medial pterygoid muscle at the origin could be divided into three types; 1) the muscle was attached to the inner surface of the medial pterygoid plate with a strong tendon, 2) to the posterior maxilla wall with a strong tendon, and 3) directly to the periosteum of the inner surface of the lateral plate without a tendon. Provided that the muscular bundles had a firmly tendinous attachment under strong and significant force during their functioning, significant force would be applied to the medial pterygoid muscle in two directions. Observations of the intersection with the medial pterygoid muscle in the posterior wall of the maxillary bone at the origin revealed intersecting fibers or tendon fusion in all 55 specimens. Since there are different muscular bundle groups within the medial pterygoid muscle, we expect to elucidate more of masticatory function by observing other masticatory muscles as well as the medial pterygoid muscle.
我们精确检查了翼内肌的起点、附着点、走向及止点，以阐明肌肉形态与咀嚼运动之间的关系。翼内肌在起点处的肌束附着可分为三种类型：1）肌肉通过强壮的肌腱附着于翼内板内表面；2）通过强壮的肌腱附着于上颌骨后壁；3）直接附着于外侧板内表面的骨膜，无肌腱。假设肌束在功能运作时在强大且显著的力作用下有牢固的腱性附着，那么强大的力会从两个方向作用于翼内肌。在起点处观察翼内肌与上颌骨后壁的交叉情况，发现所有55个标本中均有交叉纤维或腱融合。由于翼内肌内存在不同的肌束组，我们期望通过观察翼内肌以及其他咀嚼肌来进一步阐明咀嚼功能。
