Upload
azifah-zakaria
View
224
Download
0
Embed Size (px)
Citation preview
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 1/16
ل
اهال
اه
اقر لتحرر أمط النص الرئسيالمستوى الثي
● لثلا ىوتسملا●
المستوى الرابع● خلا ىوتسملا
Derivaties of germ layersEmbryonic period (3-8 weeks)
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 2/16
المستوى الثياقر لتحرر أمط النص الرئسي● لثلا ىوتسملا
● المستوى الرابع● خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 3/16
Derivatives of
ectoderm1- Surface ectoderm:
Epidermis, hair, nails,cutaneous (sebaceous andsweat) &mammary glands
Anterior lobe of pituitaryEnamel of teeth
The lower half of the anal
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 4/16
Derivatives of
ectoderm2.Neuroectoderm derivatives:
A. Neural tube:
C.N.S.Retina
Pineal body
Posterior lobe of pituitary
Iris muscle
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 5/16
Derivatives of
ectodermB. Neural crest:
Cranial(5,7,9,10)ganglia, sensory
ganglia and nerves.Medulla od adrenal gland
Pigment cells of dermis, muscle,C.T.Bones of pharyngeal arches
Meninges of brain & spinal cord
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 6/16
Derivaties of mesoderm
It differentiates into:
1-Paraxial mesoderm gives somites (42-44) . These somites further differentiateinto 3 components:
a- Sclerotome (cartilage and bone)b- Myotome (muscles)
c- Dermatome (dermis of skin)
2-Intermediate cell mass (gives kidneys&
genital system)3-Lateral plate of mesoderm.
سي
ئرلا صنلا طمأ ررحتلالمستوى الثي
● لثلا ىوتسملا● المستوى الرابع
● خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 7/16
Somites
The total number of somites is 42-44. They aredistributed in the different regions as follows:
4 occipital
8 cervical
12 thoracic
5 lumbar
5 sacral
8-10 coccygeal
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 8/16
اقر لتحرر أمط النص الرئسيالمستوى الثي
● لثلا ىوتسملا● المستوى الرابع
● خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 9/16
اقر لتحرر أمط النص الرئسيالمستوى الثي
● لثلا ىوتسملا● المستوى الرابع
● خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 10/16
Lateral plate of
mesoderm1. The parietal (somatic) mesoderm:It forms the connective tissue of the lateral and ventral body wall aswell as the parietal layers of the serous membranes (peritoneum, pleuraand pericardium). It also gives rise to the Fallopian tubes, uterus andmost of the vagina.
2. The visceral (splanchnic) mesoderm:
It forms the smooth muscles and connective tissue
of the gut and respiratory organs & the cardiac
muscle and the visceral layers of the serous
membranes.
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 11/16
Intraembryonic coelom:
Pericardial cavity
Pleural cavities
Peritoneal cavity
Cranial to buccopharyngeal membrane, themesoderm will form the cardigenic plate (future
heart) and septum transversum (futurediaphragm)
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 12/16
Diferentiation of theintraembryonic mesoderm
The mesoderm is diferentiated into threecolumns on both sides of the notochord &two masses:1- Paraxial mesoderm.2- Intermediate cell mass.3- Lateral plate.
4- septum transversum.5- Cardiogenic plate.
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 13/16
Development of the
endodermEpithelial lining of:
Gastrointestinal tract (except the anterior
part of the mouth cavity and the lower half of the anal canal).
Respiratory tract.
Most of the urinary bladder and urethra.The tympanic cavity and the Eustachiantube.
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 14/16
اقر لتحرر أمط النص الرئسيالمستوى الثي
● لثلا ىوتسملا● المستوى الرابع
●
خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 15/16
اقر لتحرر أمط النص الرئسي
المستوى الثي● لثلا ىوتسملا
● المستوى الرابع● خلا ىوتسملا
8/3/2019 Germ Layers Derivatives
http://slidepdf.com/reader/full/germ-layers-derivatives 16/16