Striated muscle fiber crossings of the head and neck: a histological study using near-term human fetuses and elderly cadavers.

IF 1.4 Q3 ANATOMY & MORPHOLOGY
Ji Hyun Kim, Kei Kitamura, Yohei Honkura, Gen Murakami, Shin-Ichi Abe
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Abstract

Striated muscle fiber crossings at almost right angle are known to exist in the face, soft palate, pharyngeal wall and tongue. We aimed to identify a specific interface tissue at the crossing. We observed histological sections from 22 half-heads of 12 near-term fetuses at 26-40 weeks (crown-rump length, 215-334 mm). For comparison, we also observed tongue frontal sections from 5 elderly cadavers (75-85 years old). At the angle of mouth as well as in the soft palate and pharyngeal wall, a solitary striated muscle fiber (e.g., levator) consistently crossed a fiber bundle of the antagonist muscle (e.g., depressor), but a solitary-to-solitary fiber interdigitation was unlikely with the antagonist muscle. Near the external nasal orifice as well as in the tongue intrinsic muscle layer, at every section, there was a crossing with an endomysium-to-endomysium contact: the nasalis and platysma muscles and; the vertical and transverse (or inferior longitudinal) tongue muscles. Therein, the functional vectors crossed at almost right angle. Also in adult tongue, the vertical and transverse muscle fibers sometimes (0-2 sites per section) crossed with an endomysium-to-endomysium contact. At the muscle crossing with an endomysium contact, the endomysium and basement membrane seemed to receive a friction stress between two muscles. Although some crossings might disappear due to high muscle activity after birth, not a few of them were likely to maintain. To minimize the mechanical stress, a minute nervous control of the timing, duration and strength of muscle contraction seemed to be necessary.

头颈部横纹肌纤维交叉:利用近月胎儿和老年尸体进行的组织学研究。
已知脸部、软腭、咽壁和舌头上存在几乎成直角的横纹肌纤维交叉。我们的目的是确定交叉处的特定界面组织。我们观察了 12 个 26-40 周(冠臀长 215-334 毫米)近足月胎儿的 22 个半头组织切片。为了进行比较,我们还观察了 5 个高龄尸体(75-85 岁)的舌额切片。在口角以及软腭和咽壁,单条横纹肌纤维(如提肌)始终与拮抗肌纤维束(如压抑肌)交叉,但单条至单条纤维与拮抗肌不可能交叉。在外侧鼻孔附近以及舌固有肌层的每个部分,都有内肌与内肌接触的交叉点:鼻肌和板肌;舌纵肌和舌横肌(或下纵肌)。其中,功能矢量几乎呈直角交叉。同样在成人的舌头上,垂直肌纤维和横肌纤维有时(每个切面 0-2 处)以肌内膜到肌内膜接触的方式交叉。在内膜与内膜接触的肌肉交叉处,内膜和基底膜似乎受到了两块肌肉之间的摩擦应力。虽然一些交叉点可能会在出生后因肌肉活动频繁而消失,但维持的可能性并不高。为了尽量减少机械应力,似乎有必要对肌肉收缩的时间、持续时间和强度进行微小的神经控制。
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来源期刊
Anatomy & Cell Biology
Anatomy & Cell Biology ANATOMY & MORPHOLOGY-
CiteScore
1.80
自引率
9.10%
发文量
75
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