By Thomas Gray; Smithsonian Institution
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The squamosal border becomes characteristically bevelled soon after birth. 0 Source Dry bone measurements on mid twentieth century Hungarian fetal remains from autopsy—males and females combined. Age was estimated based on fetal crown heel length. Gy. and Ko´sa, F. (1978). Forensic Fetal Osteology. Budapest: Akade´miai Kiado´. 34 1. 8 122–150 *Growth is essentially completed by age 4. Source Longitudinal radiographic study on 20 mid-century American boys from the Fels growth study. Notes Parietal arc: The distance from bregma to lambda along the outer table of the bone Parietal chord: The straight-line distance from bregma to lambda Reference Young, R.
Stage C (Tubercles): The anterior and posterior tubercles have approached each other but remain unconnected. Stage D (Foramen): The anterior and posterior tubercles have bridged over, creating a foramen. Stage E (Closed): The foramen of Huschke has closed. 20 1. THE HEAD AND NECK Dry Bone Assessment-Tympanic Plate Stage of Development (%) No. of Individuals No. 0 Source Dry bone observations on London remains from the early eighteenth to mid nineteenth century (Spitalfields collection) and medieval remains from Oxfordshire (Abingdon collection).
Gy. and Ko´sa, F. (1978). Forensic Fetal Osteology. Budapest: Akade´miai Kiado´. 0 7–18 Notes Height: Maximum length of internasal suture Breadth: Distance across both nasal bones at point at which frontal process of maxilla meets lateral border of nasal bones Source Not stated. Reference Lang, J. (1989). Clinical Anatomy of the Nose, Nasal Cavity and Paranasal Sinuses, trans. M. Stell. New York: Thieme. 42 1. THE HEAD AND NECK Morphological Summary Prenatal Wks 9–10 Intramembranous ossification center appears for each bone Mths 9–10 Medial articular border develops Birth Morphology similar to adult, except length-to-width proportion differs, borders are smooth, and vascular foramen is in lower half of the bone About yr 3 Superior border becomes serrated Puberty Adopts adult morphology and size 43 THE ETHMOID THE ETHMOID Superior Exposed anterior cells Orbital plate Superior concha Anterior Uncinate process Middle concha Middle concha Right perinatal ethmoidal labyrinth Identification – The perinatal ethmoid is represented by two labyrinths held together by the cartilaginous cribriform and perpendicular plates, a complete ethmoid bone is not recognizable until about the second year as the cribriform plate does not start to ossify until after birth.