Biomaterial Database

The human skull base angle during the second trimester of gestation. 1995

A S Dimitriadis, and A Haritanti-Kouridou, and K Antoniadis, and L Ekonomou

Department of Neuroradiology, AHEPA University Hospital, Aristotelian University of Thessaloniki, Greece.

In an attempt to demonstrate and explain the radiographic findings and changes in the skull base angle (SBA) during the second trimester of gestation, we examined 26 human fetal heads of 15-25 weeks gestational age by direct sagittal and axial high resolution computed tomography. The fetuses were preserved in 10% formalin. On magnified sagittal tomograms tracings of the skull base were made and three anatomical landmarks (nasion, sella turcica and the lowest part of the clivus) were used to define the SBA formed between them. The changes in the SBA during the second trimester were related to the gestational age of the fetuses. We found a significant increase of the SBA, of approximately 27 degrees, during the second trimester of gestation. This is different from previous measurements.

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D009295	Nasal Bone	Either one of the two small elongated rectangular bones that together form the bridge of the nose.	Nasal Bones,Bone, Nasal,Bones, Nasal
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D011262	Pregnancy Trimester, Second	The middle third of a human PREGNANCY, from the beginning of the 15th through the 28th completed week (99 to 196 days) of gestation.	Midtrimester,Pregnancy, Second Trimester,Trimester, Second,Midtrimesters,Pregnancies, Second Trimester,Pregnancy Trimesters, Second,Second Pregnancy Trimester,Second Pregnancy Trimesters,Second Trimester,Second Trimester Pregnancies,Second Trimester Pregnancy,Second Trimesters,Trimesters, Second
D012016	Reference Values	The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.	Normal Range,Normal Values,Reference Ranges,Normal Ranges,Normal Value,Range, Normal,Range, Reference,Ranges, Normal,Ranges, Reference,Reference Range,Reference Value,Value, Normal,Value, Reference,Values, Normal,Values, Reference
D005147	Facial Bones	The facial skeleton, consisting of bones situated between the cranial base and the mandibular region. While some consider the facial bones to comprise the hyoid (HYOID BONE), palatine (HARD PALATE), and zygomatic (ZYGOMA) bones, MANDIBLE, and MAXILLA, others include also the lacrimal and nasal bones, inferior nasal concha, and vomer but exclude the hyoid bone. (Jablonski, Dictionary of Dentistry, 1992, p113)	Bone, Facial,Bones, Facial,Facial Bone
D005260	Female		Females
D005314	Embryonic and Fetal Development	Morphological and physiological development of EMBRYOS or FETUSES.	Embryo and Fetal Development,Prenatal Programming,Programming, Prenatal
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012886	Skull	The SKELETON of the HEAD including the FACIAL BONES and the bones enclosing the BRAIN.	Calvaria,Cranium,Calvarium,Skulls