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32 Cards in this Set
- Front
- Back
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Development of the Face occurs during
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the first trimester, Weeks 3-12
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Embryonic Period
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1st 2 Calendar Months, 0-8 Weeks
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Fetal Period of First Trimester
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9-12 Weeks
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Lunar Months
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Pregnancy is 10 Lunar Months, 9 Calendar Months
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4th Week of Development
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Embryo Folding
3mm Crown-Rump Length |
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Embryo Folding
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-Embryo curls @ edges
-Rapid Growth of Forebrain & heart region (pericardial sac) |
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4th-5th Week of Development
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Stomodeum Develops
-Oral Cavity (Fold btw forebrain & pericardial sac) -Placodes develop |
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Stomodeum
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fold btw forebrain/pericardial sac, in oral cavity (lined w/ectodermal tissue), back of this region has buccopharyngeal membrane
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5th Week of Development
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Membrane dissolves, foregut continues into oral cavity, face grows btw forebrain & periocardial sac
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1st Branchial Arch/Mandibular Arch
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5th Week, btw forebrain & Pericardial sac, first cranial swelling that proliferates bilaterally, mandibular arch & frontonasal process
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Mandibular Arch gives rise to
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Midface (maxilla, zygomatics)
Lower Face (mandible) |
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Frontonasal Process gives rise to
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Forehead, Nose, Eyes, Ears
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2nd Branchial Arch
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5th Week, two bones of middle ear
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Placodes
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4th-5th Week, Olfactory, Ocular, Otic (hearing)
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Development of the Nose
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4th-5th Week, Gives rise to the palate, distinction of placodes, placodes sink, bridge of nose & upper lip develop
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Mandible is formed by
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5th week, bilateral swelling of 1st branchial arch
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Maxilla is formed by
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5th week, 2 buds/shoots of posterior mandibular arch
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5th-6th Weeks of Development
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6mm CRL, time of growth, groove btw eyes, clefts btw all processes, downward/forward growth of face until grooves disappear
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5th-7th Weeks of Development:
Expanding Head |
1st-Groove btw mandibular arch disappears @ 5 wks, 2nd-Grooves btw maxillary & medial (nose bridge) processes disappear @ 7 weeks
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Clefts
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Cleft chin if 1st mandibular arch groove doesn't disappear
Cleft palate/lip if max&med process grooves don't disappear *2 wks - max & man meet @ midline |
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8th Week of Development
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Human Face has developed
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5th-6th Weeks of Development: Oral Cavity
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Primitive Palate develops, single strand of tissue, formed by medial/nasal process and maxillary process, becomes upper lip (premaxilla)
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Premaxilla
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area around incisive foramen, incisor region helps form the upper lip
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7th-12th Weeks of Development
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Definitive Palate formed by 2 shelf-like structures that grow inside the stomodeum, lateral shelves drop & form palatine suture
Nasal placode sinks in Eyes rotate to front of head |
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Hypertelorism
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inability in rotatin of eyes toward front of head
i.e. fetal alcohol syndrome i.e. down's syndrome |
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9th-12th Weeks
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Everything is preformed in cartilage (meckel's and condocranial)
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Meckel's Cartilage
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grows together into 1st branchial arch, guide for mandible which lays over cartilage later
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Condocranial Cartilage
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In maxillary process as it grows towards the midline, grows into nasal capsule, provides basis for cranial base
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Organogenesis
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development of facial organs
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9th-40th Weeks of Pregnancy
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Ossification & growth of what was laid down in the Embryonic Period
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By 9th Week of Development
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Fully formed face
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Telortologist
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one who studies birth defects
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