Development L4 - Oral development biology: face, jaws, mouth Flashcards
Prominence in the upper facial area at the most cephalic end of the embryo. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
fronto-nasal process
Head end of a structure such as the trilaminar embryonic disc. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
Cephalic end
Processes of first branchial arch that fuse at the midline to form mandibular arch. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
Mandibular processes
Lower dental arch with mandibular teeth or the 1st Branchial/Pharyngeal arch inferior to the stomodeum in the embryo. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
Mandibular arch
Prominence from mandibular arch that grows superiorly and anteriorly on each side of the stomodeum of the embryo. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
Maxillary processes
Upper dental arch in which the maxillary teeth form. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
Maxillary arch
Placodes that develop into olfactory organ for the sensation of smell located in the mature nose.best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
nasal placode
Area of ectoderm found at the location of the developing special sense organs on the embryo. best describes what?
Fronto-nasal process
Cephalic end
Mandibular processes
Mandibular arch
Maxillary processes
Maxillary arch
Nasal placode
Placode
placode
fusion between the medial nasal prominences is regarded as not true fusion why is this.
the medial nasal prominences proliferate upwards alowing the fusion of prominences by the elimination of furrow
the fusion between medial nasal prominence and maxillary process is classified as a true fusion. why is this.
as the medial nasal prominence and maxillary process proliferate they merge together causing a fusion between the two structures.
which structure devlops in the stomodeum
tongue
describe and illustrate the formation of the face from weeks 4 to 7
4th week:
primitive stomodeum bounded by
FNP, max. and mand. process
nasal placodes, develop into nasal pits
5th week:
nasal pit surrounded by lateral + medial nasal prominence
6th+7th week:
Medial nasal prominences fuse together and fuse with maxillary processes
which facial prominence contributes to the development of the philtrum
the medial nasal prominence
which facial prominence contributes to the crest and tip of the nose
medial nasal prominence
which facial prominence contributes to the forehead and bridge of nose
frontonasal prominence
which facial prominence contributes to the alae of nose
lateral nasal prominence
which facial prominence contributes to the cheeks and lateral upper lip
maxillary prominence
which facial prominence contributes to the lower lip
mandibular prominence
in which week of embro development would you expect to see the first sign of tooth development
week 6
the nasal capsule undergoes mesenchymal condensation and is the primary support for developing maxilla.
the nasal capsule remains continuous with cartilages from which part of the cranium
the cranial base
the intermaxillary segment is part of which palate
primary palate
ossification of the cartilage of the face occur at different times
when does the ossification of the following occur.
mandible
maxilla
palate and nasal capsule
mandible - 6-7 weeks
maxilla - 8 weeks
palate and nasal capsule - 8 weeks
what are the two methods of osteogenesis
intramebranous
endochondral
what type of ossification is being described
mesenchymal cells differentiate to osteoblast
osteblasts deposit osteoid
minerals are depositied
osteoblasts that are trapped or osteocytes
intramembranous ossification
we know that ossification occurs and is driven by the primary centres of ossification
we also know that nerves are also responsible for driving ossification.
where would you find the primary centres for ossification in the maxilla
maxillary process
near nasal capsule
between infraorbital nerve and anterior aspect of the superior alveolar branch
which nerve drives ossification towards the frontal process, palate, alveolus and zygomatic
the infraorbital nerve
which two cells are responsible for the production of cartilage
chondroblast and chondrocytes
there are three types of cartilage in the body
hyaline, fibrocartilage and elastic cartilage
match the cartilage with its correct description
- most common has a glassy appearance
- tendon insertions and intervertebral discs reinforced with collagen bundles
- external ear and epiglottis: flexible and resilient- has elastic fibres
Hyaline - most common has a glassy appearance
Fibrocartilage - tendon insertions and intervertebral discs reinforced with collagen bundles
elastic cartilage - external ear and epiglottis: flexible and resilient- has elastic fibres
cartilage has 3 main functions
- provide support framework for some organs
- to form the articulating surface of bones
- to form the template for gworth and development of long bones (endochondral ossification)
the connective tissue that envelops cartilage where it is not at a joint. is called a what?
perichondrium
in terms of vasculature how does cartilage differ compared to other connective tissue
AVASCULAR
where would you expect the formation of the mandible to occur and what tyoe of ossification occurs.
the formation of the mandible will commence at the lower jaw region.
this is where the primary ossification centre is, at the bifurcation of the mental and incisve nerve.
the meckels cartilage doesnt form the mandible but more provides a framework for the mandible.
the type of ossification that occurs is intramembranous ossification.
intramembranous ossification process starts with the differentiation of mesenchymal condensation to what cells?
osteoblast
the mandible has secondary cartilages present which secondary cartilage;
appears during 10-12 weeks IUL (intrauterine life)
disappears at 20 years of age
the condylar cartilage appears during weeks 10-12 of IUL and dissapears at age 20
this cartilage is the most sensitive cartilage in body and can be manipulated to stimulate the development of the mandible (functional appliances)
the mandible has secondary cartilages present which secondary cartilage;
- appear 14-16 weeks IUL
- disappear before birth
the coronoid carilage
the mandible has secondary cartilages present which secondary cartilage;
- appear 16 weeks
- disappear 1st year after birth
symphyseal cartilage
secondary cartilages undergo what type of ossification for postnatal development
endochondral ossification
