Development Of Face Flashcards
The facial primordia appear early in the ——— week around the primordial ———
The facial primordia appear early in the fourth week around the primordial stomodeum
How many facial primordia appear as prominences around the stomodeum, list them
Five facial primordia appear as prominences around the stomodeum
The single frontonasal prominence
The paired maxillary prominences
The paired mandibular prominences
The paired facial prominences are
derivatives of the —— pair of pharyngeal arches
The prominences are produced mainly by the proliferation of ———— cells.
These cells migrate from the ——— and & ———— regions of the neural folds into the arches during the ——— week
The paired facial prominences are
derivatives of the first pair of pharyngeal arches
The prominences are produced mainly by the proliferation of neural crest cells.
These cells migrate from the Mesencephalon and & Rhombencephalon regions of the neural folds into the arches during the fourth week
The Nasal placodes:
Two bilateral oval thickenings in the surface ectoderm, of the ——— prominence, appear, by the end of the ——— week.
Nasal placodes are the primordia of the —— and ———
Initially these placodes are ——.
Later, they are stretched to produce a ——— in each placode.
The Nasal placodes:
Two bilateral oval thickenings in the surface ectoderm, of the frontonasal prominence, appear, by the end of the fourth week.
Nasal placodes are the primordia of the nose and nasal cavities.
Initially these placodes are
convex.
Later, they are stretched to produce a flat depression in each placode.
Mesenchyme in the margins of the placodes proliferate, producing —— shoe shaped elevations called —— and ——— prominences
Now the nasal placodes lie in depression called ———
These pits are the primordia of the ——— and ———
Mesenchyme in the margins of the placodes proliferate, producing horse shoe shaped elevations called medial and lateral nasal prominences
Now the nasal placodes lie in depression called nasal pits
These pits are the primordia of the anterior nares (nostrils) and nasal cavities
Mesenchymal cells are the major source of the connective tissue components, including ——, ——, ——, and —— in the facial and in the oral regions.
Mesenchymal cells are the major source of the connective tissue components, including muscles, cartilage, bone, and ligaments in the facial and in the oral regions.
THE FRONTONASAL PROMINENCE (FNP) IS FORMED OF 2 PARTS:
1- —— part: forms the ———
2- —— part: forms the —— boundary of the ——.
THE FRONTONASAL PROMINENCE (FNP) IS FORMED OF 2 PARTS:
1- Frontal part: forms the forehead
2- Nasal part: forms the rostral boundary of the stomodeum.
.
The paired maxillary prominences form the —— boundaries of the stomodeum
The paired mandibular prominences constitute the —— boundary of the primitive mouth
.
The paired maxillary prominences form the lateral boundaries of the stomodeum
The paired mandibular prominences constitute the caudal boundary of the primitive mouth
Facial development occurs mainly between—— and —— weeks
4 and 8
By the end of the——- week the face has an undefined human appearance
Embryonic (8th)
Between the —th and —th weeks, the two medial nasal prominences merge with each other and with the —— and —— prominences
Merging of the medial nasal and maxillary prominences results in continuity of the —— and —— and separation of the —— from the ——
Between the 7th and 8th weeks, the two medial nasal prominences merge with each other and with the maxillary and lateral nasal prominences
Merging of the medial nasal and maxillary prominences results in continuity of the upper jaw and upper lip and separation of the nasal pits from the stomodeum
The —— and —— are the first parts of the face to form.
They result from merging of the medial ends of the —— prominences in the median plane.
———- lower lip is a very rare condition.
The lower jaw and lower lips are the first parts of the face to form.
They result from merging of the medial ends of the mandibular prominences in the median plane.
Median cleft lower lip is a very rare condition.
Each lateral nasal prominence is separated from the maxillary
prominence by a cleft called ——— groove
nasolacrimal groove
The ———— develops from a rodlike thickening of ectoderm in the floor of the nasolacrimal groove.
This thickening gives rise to a solid epithelial cord that separates from the ectoderm and sinks into the mesenchyme.
As a result of cell degeneration, this epithelial cord canalizes to form the ———
The nasolacrimal duct develops from a rodlike thickening of ectoderm in the floor of the nasolacrimal groove.
This thickening gives rise to a solid epithelial cord that separates from the ectoderm and sinks into the mesenchyme.
As a result of cell degeneration, this epithelial cord canalizes to form the nasolacrimal duct.
The cranial end of this duct expands to form the ———
By the late —— period, the nasolacrimal duct drains into the ——— in the lateral wall of the nasal cavity
The duct usually becomes completely patent only after ———
Occasionally, part of the duct fails to canalize causing ——- of the nasolacrimal duct.
The cranial end of this duct expands to form the lacrimal sac
By the late fetal period, the nasolacrimal duct drains into the inferior meats in the lateral wall of the nasal cavitv
The duct usually becomes completely patent only after birth
Occasionally, part of the duct fails to canalize causing atresia of the nasolacrimal duct.
