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Kitamura K, Suzuki R, Ishizuka S, Murakami G, Rodríguez-Vázquez JF, Yamamoto H, Abe SI. Growing stylohyoideus muscle insertion to the hyoid bone with special reference to its topographical relation to the intermediate tendon of digastricus muscle: A histological study using human fetuses. Ann Anat 2024; 254:152246. [PMID: 38460858 DOI: 10.1016/j.aanat.2024.152246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/16/2024] [Accepted: 03/05/2024] [Indexed: 03/11/2024]
Abstract
BACKGROUND In adults, the intermediate tendon of digastricus muscle usually runs along the medial or lateral side of the stylohyoideus muscle insertion. To provide a better understanding of the variations, we examined the topographical anatomy of the muscle and tendon in fetuses. METHODS We examined histological sections from six early-term, 26 mid-term and six near-term fetuses (approximately 8-9, 12-18 weeks and 25-33 weeks). RESULTS At early-term, an initial sheath of intermediate tendon of digastricus muscle received the stylohyoideus muscle at the superior aspect. The muscle and tendon was distant from the hyoid. At mid-term, near the insertion to the hyoid greater horn, the stylohyoideus muscle consistently surrounded more than 2/3 of the intermediate tendon circumference. In contrast, we found no near-term specimen in which the stylohyoideus muscle surrounded the intermediate tendon. The multilayered tendon sheath was fully developed until near-term and connected to the body of hyoid by an intermuscular septum between the thyrohyoideus muscle and one or two of suprahyoid muscles. Therefore, the hyoid insertion of the styloglossus muscle was a transient morphology at mid-term. CONCLUSION The stylohyoideus muscle insertion was appeared to move from the tendon sheath to the hyoid greater horn and, until near-term, return to the tendon sheath. A fascia connecting the tendon sheath to the body of hyoid was strengthened by the suprahyoid and infrahyoid muscles. The latter muscles seemed to regulate fixation/relaxation of the intermediate tendon to the hyoid. The stylohyoideus muscle slips sandwiching the intermediate tendon might be a rare morphology.
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Affiliation(s)
- Kei Kitamura
- Department of Histology and Developmental Biology, Tokyo Dental College, Tokyo, Japan.
| | - Ryu Suzuki
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan.
| | | | - Gen Murakami
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan; Division of Internal Medicine, Cupid Clinic, Iwamizawa, Japan.
| | | | - Hitoshi Yamamoto
- Department of Histology and Developmental Biology, Tokyo Dental College, Tokyo, Japan.
| | - Shin-Ichi Abe
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan.
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Yamamoto M, Hirota Y, Watanabe G, Taniguchi S, Murakami G, Rodríguez-Vázquez JF, Abe SI. Development and growth of median structures in the human tongue: A histological study using human fetuses and adult cadavers. Anat Rec (Hoboken) 2024; 307:426-441. [PMID: 36939757 DOI: 10.1002/ar.25198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 02/20/2023] [Accepted: 02/22/2023] [Indexed: 03/21/2023]
Abstract
Glossectomy is a surgical procedure performed to remove all or part of the tongue in patients with cancer. The removal of a significant part of the tongue has a marked effect on speech and swallowing function, as patients may lose not only the tongue muscles but also the median lingual septum (MLS). Therefore, to achieve successful tongue regeneration, it is necessary to investigate the developmental processes of not only the tongue muscles but also the MLS. This study was conducted to clarify the mutual development of the tongue muscles and the MLS in human fetuses. Serial or semi-serial histological sections from 37 embryos and fetuses (aged 5-39 weeks) as well as nine adults were analyzed. The MLS appeared at Carnegie stage 15 (CS15), and until 12 weeks of gestation, abundant fibers of the intrinsic transverse muscle crossed the septum in the entire tongue. However, in near-term fetuses and adults, the contralaterally extending muscles were restricted to the deepest layer just above the genioglossus muscle. This finding indicates that the crossing transverse muscle showed the highest density at mid-term. A thorough understanding of both the MLS and the tongue muscles is necessary for successful tongue regeneration.
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Affiliation(s)
| | | | - Genji Watanabe
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan
| | | | - Gen Murakami
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan
- Division of Internal Medicine, Cupid Clinic, Iwamizawa, Japan
| | | | - Shin-Ichi Abe
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan
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Jin ZW, Kim JH, Yamamoto M, Katori Y, Abe H, Murakami G, Abe SI. Growth in fetuses of the constrictor pharyngis superior with special reference to its meeting with the buccinator: an embryological basis of adult variations in palatopharyngeal anatomy. Surg Radiol Anat 2022; 44:559-571. [DOI: 10.1007/s00276-022-02907-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 02/14/2022] [Indexed: 01/13/2023]
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Yurasakpong L, Nantasenamat C, Janta S, Eiamratchanee P, Coey J, Chaiyamoon A, Kruepunga N, Senarai T, Langer MF, Meemon K, Suwannakhan A. The decreasing prevalence of the thyroid ima artery: A systematic review and machine learning assisted meta-analysis. Ann Anat 2021; 239:151803. [PMID: 34265384 DOI: 10.1016/j.aanat.2021.151803] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/20/2021] [Accepted: 06/28/2021] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Thyroid ima artery is a variant artery found on the anterior surface of the trachea. The aim of this meta-analysis was to obtain pooled prevalence data of the thyroid ima artery and discuss its clinical importance especially for tracheostomy. METHODS A systematic literature search was performed through five electronic databases until May 2021. A set of inclusion and exclusion criteria based on AQUA guidelines were used to select relevant studies. Meta-analysis, subgroup analyses, meta-regression, and tests for publication bias were performed. Factors that influence the prevalence of the thyroid ima artery were detected using simple and interpretable machine learning (linear regression and K means). RESULTS Thirty-six studies with a total of 4335 subjects met the inclusion criteria. The prevalence of the thyroid ima artery was 3.8% (95% CI: 0.027-0.049, I2=56.2%). Machine learning identified age, region and year of publication as potential covariates. Subgroup analysis showed that the prevalence of the thyroid ima artery was 4.5 times higher in fetuses (14.8%) than adults (3.3%) (z=-6.76, p<0.01). There was a significant negative correlation between the adult prevalence of the thyroid ima artery and the year of publication (Pearson's r=-0.354, p=0.040) thereby suggesting a decline in thyroid ima artery prevalence over time. This artery, if present, may originate from the brachiocephalic trunk (74%), right common carotid artery (9.6%), arch of aorta (7.7%), right internal thoracic artery (4.8%), left common carotid artery (1.9%) and left internal thoracic artery (1.9%). CONCLUSION In addition to evidence-based synthesis of the thyroid ima artery, this study is the first ever study to report the decreasing prevalence over time of a human body structure in the postnatal life. Knowledge of the thyroid ima artery is of vital importance for surgeons to avoid accidental hemorrhage during tracheostomy.
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Affiliation(s)
| | - Chanin Nantasenamat
- Center of Data Mining and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
| | - Sirorat Janta
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Pinthusorn Eiamratchanee
- St. George's International School of Medicine Keith B. Taylor Global Scholars Program, Northumbria University, Newcastle-upon-Tyne, United Kingdom; Department of Anatomical Sciences, St. George's University, School of Medicine, Grenada, West Indies
| | - James Coey
- St. George's International School of Medicine Keith B. Taylor Global Scholars Program, Northumbria University, Newcastle-upon-Tyne, United Kingdom; Department of Anatomical Sciences, St. George's University, School of Medicine, Grenada, West Indies
| | - Arada Chaiyamoon
- Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Nutmethee Kruepunga
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Thanyaporn Senarai
- Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Martin Franz Langer
- Department of Traumatology and Hand Surgery, University Hospital Münster, Albert-Schweitzer-Campus, Münster, Germany
| | - Krai Meemon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Athikhun Suwannakhan
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand.
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