Related Experiment Video
Updated: Jan 31, 2026
Methods for the Study of the Zebrafish Maxillary Barbel
Published on: November 23, 2009
Premaxillary-maxillary suture development in the first trimester : An ultrasound study
Wen-Hua Ruan1, Wu-Qun Han2, Mei-Li Huang3
1Department of Stomatology, The Children's Hospital, Zhejiang University, School of Medicine, 3333 Binsheng Road, 310052, Hangzhou, China. 1804052376@qq.com.
Purpose:
Our study was designed to investigate premaxillary-maxillary suture growth in fetuses from the first trimester of pregnancy using the B‑ultrasound technique in order to determine the suture fusion time.
Methods:
We selected 169 healthy Han singleton pregnancies as subjects. All subjects received routine pregnancy tests and were divided into three groups based on the gestational age of the fetus: group 1, the 11th gestational week; group 2, the 12th gestational week; and group 3, the 13th gestational week. Fetal biometric measurements were recorded during consecutive prenatal ultrasonographic examinations. These measurements included nuchal translucency thickness, crown-rump length, and premaxillary-maxillary length. Intergroup comparisons were performed using analysis of variance (ANOVA).
Results:
The premaxillary-maxillary suture grows gradually and its measured length at the 11th, 12th and 13th week was 0.54 cm, 0.65 cm, and 0.74 cm, respectively. We observed a significant linear correlation between the premaxillary-maxillary length and the week of gestation in the first trimester. The growth rate of the maxilla at the 11th, the 12th and the 13th week are significantly different with a descending order of growth rates being week 12, week 11 and week 13, with the 12th week rate being the most rapid.
Conclusion:
The premaxillary and maxillary growth at 11 and 12 gestational weeks in the first trimester steadily accelerated, peaking at the 12th week. The rate of growth slows down after week 12 which may be associated with the fusion of the premaxillary-maxillary suture.
More Related Videos
Related Concept Videos
01:22Sutures of the Skull
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
01:25Ultrasound II: Endoscopic Ultrasound and FibroScan
Endoscopic Ultrasound (EUS):
01:43Sustainable Development
01:20Ultrasound I: Abdominal Ultrasonography
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...
01:22Case Studies
01:15Development of the Lymphatic System
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...