Embryonic Period Flashcards
Period of “organogenesis” - development of?
Period of “organogenesis” - development of
ORGANS
Embryonic period Occurs from___ to __ weeks of pregnancy
3rd to 8th
T or F
by the end of the embryonic period the main organs are established, rendering the features of the external body
TRUE
What day?
your neural tube will have the neural plate, and the depression at the center is the neural groove
By the 19th day
What day?
There is a formation of neural folds, that will continue to rise until they fuse
Day 22
What day?
the heart begins to beat, ___week of development.
the heart begins to beat, 4th week of development.
Day 24-28
T or F
The venous system is ready to supply nutrients and oxygen by the 50th day only
FALSE
The venous system is ready to supply nutrients
and oxygen by day 24-28
The cranial neuropore will close at Day ?
The cranial neuropore will close at Day 25
The caudal neuropore closes by Day ?
The caudal neuropore closes by Day 28
Process whereby neural plate is transformed to neural tube
Neurulation
T or F
At the 2nd week, the lateral edges form a neural
fold that gradually fuse at the midline to form the
neural tube
FALSE
At the 3rd week, the lateral edges form a neural
fold that gradually fuse at the midline to form the
neural tube
T or F
Fusion begins cranially and caudally - shoulder to legs
Neural Tube forms as a result
FALSE
Fusion begins cranially and caudally - head to
legs
Neural Tube forms as a result
Structures formed from ectodermal layer
CNS
➢ PNS
➢ Epidermis
➢ Enamel of teeth
➢ Mammary Glands
➢ Pituitary Glands
During the ___day, your cells will proliferate your
midline forming your paraxial mesoderm
During the 17th day, your cells will proliferate your
midline forming your paraxial mesoderm
The mesoderm layer remains thin laterally forming the ___Plate
In your paraxial, we have your head and somites
Mesoderm layer remains thin laterally forming the
Lateral Plate
In your paraxial, we have your head and somites
T or F
Paraxial Mesoderm forms somitomeres to somites which will give
rise to the
TRUE
muscle tissue supplied by one nerve
Myotome
cartilage and bone supplied by one nerve
Sclerotome
dermis of the skin supplied by one nerve
Dermatome
Forms excretory units of the urinary system and
the gonads develop from this segment
Intermediate Mesoderm
Forms the kidney and gonads, testes and ovaries
Intermediate Mesoderm
two layers of the lateral mesoderm, what is inner what is outer?
Parietal Layer - outer layer
Visceral Layer - inner layer
What forms the git tube
Visceral Layer - inner layer
Forms dermis of skin body wall and limbs, the bones, and connective tissue of limbs
▪ Forms the lateral body wall folds
▪ Forms the parietal layer of serous membrane
Parietal Layer - outer layer
Space between the parietal and visceral layer of the lateral plate mesoderm
Body Cavity
- divides it into thoracic and peritoneal
cavities for your thorax and abdominal organs
Diaphragm
divides into pericardial cavity and two pleural cavities
Thoracic Cavity
Structures formed from Mesodermal Layer
Vascular System - heart, arteries, veins
Urogenital System - kidneys, gonads, and their ducts
Spleen
Suprarenal Glands
Three Regions of the GUT tube
- foregut, midgut, hindgut
Structures formed in the Endoderm
GIT - main organ formed
o Epithelial lining of the GIT, Respiratory tract, and Urinary Bladder
o Epithelial lining of tympanic cavity and auditory tube
o Parenchyma - thyroid, parathyroid, liver, pancreas
Neural tube defect (NTD) due to failed closure of
cranial region
Brian failed to form properly
They have learning difficulties
Anencephaly
Neural Tube Defect (NTD) due to failed closure
of caudal region
The most common site is the lumbosacral region
Spina Bifida
An abnormality of migration of neural crest cells
into the pharyngeal arches can lead to improper
development of the parathyroid glands, thymus,
facial skeleton, heart, aorta, and pulmonary trunk
DiGeorge Syndrome or Catch22 Syndrome
They are more likely to suffer from -
Hypocalcemia, Cleft Palate, Tetralogy of Fallot,
Recurrent Infection, Renal Problems, and
Learning Problems
DiGeorge Syndrome or Catch22 Syndrome
Tetralogy of Fallot - you have a 4 defect, the
ventricular septal defect, pulmonary stenosis,
misplaced aorta, and right ventricular
hypertrophy. It is a domino effect
DiGeorge Syndrome or Catch22 Syndrome
Occurs when body wall closure fails in the
abdominal region
. Gastroschisis
Intestinal loops hemiate into the amniotic cavity
through the defect which usually lies to the right
of umbilicus
. Gastroschisis
Peritoneal and pleural cavities are continuous along the posterior body wall
o This hernia allows abdominal visceral to enter pleural cavity, usually on left
Congenital Diaphragmatic Hernia
Upper portion of the stomach are retained in the
thorax and the stomach is considered at the level of
diaphragm
Esophageal Hernia
