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1. Methods:The morphology, blood vessel, and nerve of infrahyoid muscles(40 cases or 80sides)were studied and measured by cephalocevical sample dissection.

2. Infrahyoid myocutaneous flaps were used in 60 cases, platysma flaps in 45 cases, sternocleidomastoid flaps in 59 cases and submental island flaps in 8 cases.

3. Thesubmandibular glands lied superficial to the suprahyoid, and infrahyoid muscle groups, and were covered by the inferior portion of the parotid gland.

4. Results Among 153 survival flaps, there were 55 infrahyoid myocutaneous flaps, 40 platysma flaps, 52 sternocleidomastoid flaps and 6 submental island flaps.

5. Objective:To provide anatomical data for repairing oral maxillofacial defects with infrahyoid myocutaneous flap resection of malignant tumor.

6. It is found the suprasternal space should be enclosed by the superficial layer of the deep cervical fasciae and the fasciae of the infrahyoid muscles, rather than the past opinion of the textbook.

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7. It was found the suprasternal space was enclosed by the superficial layer of the deep cervical fasciae and the fasciae of the infrahyoid muscles.

8. The results showed that the pretracheal space and the posterior infrahyoid space located in front of the viscera of the neck and the retropharyngeal space and the danger space behind it respectively.

9. Reconstruction: Larynx: the remains of epiglottis, perichondrium of thyroid cartilage, the infrahyoid muscular fascia, and the platysmal flap were utilized to restore the defects of larynx.

10. Results The deep cervical fascia was divided into four layers with the fasciae of the infrahyoid muscles being a single layer.