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83 Cards in this Set

  • Front
  • Back
The developing human goes through ____ stages
what stage is from fertilization - 2 weeks
The embryo stage is from how many weeks
3 - 8 weeks
The fetus stage is from how many weeks
9 - 36
Name the three germ layers.
Is ectoderm

What is mesoderm
what is entoderm
The features of the face begin to develop at __ weeks
The embryo began as a ___ ___ structure consisting of the three germ layers
disk like
Disk-like structure develops into an _____ _____ closed at the upper and lower ends.
elongated tube
The _____ ____ has a spinal cord, brain, and body wall.
elongated tube
Hollow tube is the future digestive tract and is divided into what 3 parts?
is the foregut --- upper, middle, or lower
Is the hindgut --- upper, middle, lower
is the midgut --- upper, middle, lower
Buccopharyngeal membrane is the obstruction between the foregut and _______
U shaped bars of tissue that open toward and surround foregut and part of primitive oral cavity.
total of 6 arches
pharyngeal arches
name the upper 2 pharyngeal arches
mandibular arch, and hyoid arch
what is pharyngeal arch 1
what is pharyngeal arch II
This happens at what week?
- nasal pits
- medial and lateral nasal processes on either side of the pits
- maxillary processes start to grow toward the midline
4th week
two medial nasal processes and two maxillary processes have formed the
______ ____
Upper lip
the lateral nasal processes take NO part in forming the _____ ____
Upper lip
4th week
The nasal pits open into the primitive oral cavity at this time
medial nasal and maxillary processes fuse at lower end known as the ____ ___
nasal fin
____ ____ forms perforations that allow migration to occur between medial nasal and maxillary processes
nasal fin
_____ ____ occurs migration fails
separation of medial nasal process and the maxillary process
occurs by the ____ week
Cleft lip, 6th week
Most often seen on the left side- unknown reason for occurrences
More often seen in boys than girls
cleft lip
_____ - lack of connective tissue migration (fusion) between one maxillary process with the medial nasal process.
______ - neither of the maxillary processes fuse with the medial nasal processes
_____ _____ ______, form small V-shaped wedge of tissue lingual to maxillary centrals and laterals and back to the incisive foramen.
Medial Nasal Processes-- under palatal development
V-shaped wedge of tissue also known as the _____ _____
primary palate --- under palatal development
Primary palate begins to develop about ____ to ___ weeks
6 1/2 to 7weeks -- under palatal development
*Right & Left Maxillary Processes*
Formation of the hard and soft palate (secondary palate) begins at ___-___ weeks with growth of medial nasal processes into primary palate.
6 1/2 to 7 weeks
*Right & Left Maxillary Processes*
Small ledges of ______ - covered tissue start growing inward from maxillary processes and form the palatal processes or palatal shelves of maxillae
Cleft Palate occurs between the ___-___ week
7-11 week
______- cleft palate only 1 of 2 palatal processes fuses with nasal septum (oral cavity open to nasal cavity)
______- cleft palate - neither palatal process fuse with opposing process or nasal septum
1:2000 african americans of USA
3:2000 Asians
Combined cleft lip and palate
Causes of _____
Hereditary factors
environmental factors
heavy drinkers
heavy smokers
anemia during pregnancy/deficiency in folic acid
Causes of Clefts
lateral lingual swellings, tuberculum impar, and copula
Upward growth of portion of the oral cavity which meets downward growth of a portion of the brain
Rathke's Pouch
_____ develops from the oral epithelium.
Enamel -- dental lamina
Dental Lamina

The oral epithelium comes from the embryonic germ layer known as the _____
More than 6 teeth missing _____
fewer than 6 teeth missing _____
as the concavity of the deep part of the cap grows even more pronounced it now becomes known as the ____ ____
Bell Stage
In the bell stage there will appear 4 layers known as the _____ ______
stratum intermedium
The bell stage with its stratum intrmedium comprises several layers of flattened squamous cells lying between the IEE and the _____ ______
Stellate Reticulum
which of the 3 germ layers forms the, spinal cord, skin structures, special senses.
Which of the 3 germ layers forms all connective tissue, muscular, skeletal circulatory and lymph.
inner germ layer of an embryo that forms the epithelial lining of of organs such as the digestive tract, liver, lungs, and pancreas
At ____ weeks buccopharyngeal membrane breaks down between forgut and stomodeum and connection is made between future oral cavity and digestive tract.
4 1/2 weeks
_______ membrane, is the obstructin between the foregut and stomodeum, the double layered membrane that separates primitive mouth from developing pharynx.
______ large intestine descending colon
______ throat to duodenum, forms pharynx and digestive organs
_______, small intestine, cecum, blind pouch that forms the first pouch of the large intestine ascending colon most of transverse colon.
Median palatine cyst found at midline of the 2 palatal _____
the ____ arch will form nothing and the 4th and 6th arch are poorly developed
_____ process, form most of the maxilla and the palatine bones (hard palate, zygomatic bone).
_____ process, form the mandible
* nasal pits
* medial and lateral nasal processes on either side of the pits
4th week
Maxillary processes start to grow toward the midline.
4th week
In the ___ & ___ week maxillary processes fuse w/ primary palate and then with each other 1st in anterior region and then move backwards like a zipper completed by the 11th week
7th and 8th
_____ _____ forms anterior part of pituitary gland- master gland of the body and pars intermedia
Rathke's Pouch
Downward growth forms posterior pituitary - ____ ___
Rathke's Pouch
First signs of tooth development are seen during the ___ embryonic week
At this time the embryonic oral epi stratified squamous begins to thicken
6th week
Embryonic downgrowth of oral epithelium that is the forerunner of the tooth germ.
Dental lamina
At about the ___ week there is 10 areas of thickening in the maxillary dental lamina 10 areas of thickening in the mandible
8th week
this is the first stage in the development of the enamel organ that forms the enamel of the teeth.
enamel organ
Poor development of structures arising from ectoderm, for example, skin, eyes, nails, hair, sweat, and sebaceous glands, facial structure, and teeth (old man syndrome)
Ectodermal dysphasia
It is a group of cells from the dental lamina of the oral epi that is projecting down ingot the underlying connective tissue.
Enamel organ
____ ____ epi, outermost part of the structure of the cap stage
Outer enamel
_____ _____ epi, the cells that outline the concavity in the deepest part of the cap stage. These cells are continuous with the outer enamel epi.
Inner enamel epi
_____ _____, originate from the superficial layers of the oral epi. ectodermally and epithelially derived middle layer of the enamel organ. it serves as a cushion for the developing enamel
Stellate reticulum
____ _____- 4th developing layer of the enamel organ; responsible for aiding ameloblasts nourishment.
stratum intermedium
protective layer for the entire enamel organ. will later play a role in attaching the gingival to the tooth.
change and become responsible for the formation of enamel (ameloblasts)
IEE cells
____ ____- cushioning layer protection and nourishment for the IEE cells.
Stellate Reticulum
help provide nourishment for IEE cells and produce protein nourishes ameloblasts.
Stratum intermedium.
____ ____
- arises from mesoderm
- located next to the IEE
- first seen in the late bud stage
- forms the dentin and the pulp
Dental Papilla
_____ ____
- Surrounds part of the dental papilla and part of the enamel organ
- arises from mesoderm
- forms the cementum, perio ligament, and some of the alveolar bone
- often called dental follicle
Dental Sac