Embryo 3rd week
Terms
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- Grastulation involves the formation of the ____, _____, and _____.
- notochord, germ layers, primitive streak
- On day ____ a thickened band of ____ cells appears caudally in the midline of the embryonic disk. This is called ____.
- 15, epiblasts, primitive streak
- The cranial end of the primitive streak is called the _____.
- primitive knot (Hansens Node)
- Cells that multiply in the epiblast and migrate toward the primitive streak and then migrate through the groove are called _____.
- mesoderm
- Mesoderm that form a layer between the epiblast and the hypoblast are called _______.
- intraembryonic mesoderm
- By the ___ week the primitive streak diminishes in size and becomes an insignificant structure in the _____ region.
- 4th, sacrococcygeal
- Mesodermal cells migrate between the epiblast and hypoblasts in all regions, except the ____ and ____, which are ____ in origin.
- prochordal, cloacal, endoderm
- The prochordal plate is the furture site of the ____, and the cloacal plate is the future site of the ____.
- mouth, anus
- The prochordal plate and cloacal plate fuse with _____ to form the _____ and _____.
- ectodermal cells, oropharyngeal membrane, cloacal membrane
- The _____ mesoderm covers the yolk sac and amnion.
- extraembryonic
- Mesoderm that migrates around the prochordal plate form the ____ area.
- cardiogenic
- Mesodermal cells migrating from the primitive knot to the prochordal plate form the ____.
- notochord
- The ____ induces neural tube formation.
- notochord
- The ____ is the structure around which the vertebral column forms.
- notochord
- The notochord degenerates and exists as the ____.
- nucleus pulposus
- The ____ is associated with early blood formation and in formation of the urinary bladder.
- allantosis (Day 16)
- The blood vessels of the allantosis become the ____.
- umbilical veins and arteries
- Neurulation is the process involved in the formation of the ____, ____ and their closure to form the ____.
- neural folds, neural plate, neural tube
- Neurulation is completed by the end of the ___ week when the ___ closes.
- 4th, caudal end of the neuropore
- The ____ overlying the notochord form the _____ plate.
- ectoderm, neural
- The ectoderm of the neural plate is called _____ and will give rise to the _____.
- neuroectoderm, CNS
- The surface ectoderm of the neural tube form the ____, ____, and ____, with the remaining surface ectoderm forming the ___.
- lens, optic, nasal placodes, epidermis
- The neural plate invaginates forming the ___ with 2 _____.
- neural groove, neural folds
- The neural folds fuse converting the ____ into a ____.
- neural plate, neural tube( closes day 26)
- ____ cells resting along the crest of each neural fold seperate and form the _____.
- Neuroectoderm, neural crest cells
- Neural crest cells migrate and give rise to the ____ of the spinal and cranial nerves.
- sensory ganglia
- The CNS arises from the _____.
- ectoderm
- The PNS arises from the _____.
- ectoderm
- The sensory epithelium of the sensory organs arise from ___.
- ectoderm
- The epidermis, including hair, nails, cutaneous and mammary glands arise from _____.
- ectoderm
- The anterior pituitary gland arises from ____.
- ectoderm
- The enamel of the teeth arise from the ____.
- ectoderm
- Derivatives of the neural crest give arise from the ____.
- ectoderm
- The ____ proliferates and condenses to form 2 colums of paraxial mesoderm.
- intraembryonic mesoderm
- The ____ mesoderm thins out lateraly into a layer of ____ mesoderm.
- intermediate, lateral
- The ____ mesoderm differentiates into blocks of mesodermal tissure called somites by the end of the 3rd week.
- paraxial
- The paraxial mesoderm differentiates into blocks of mesodermal tissure called ____ by the end of the 3rd week.
- somites
- Dermatomes form ____.
- dermis
- Myotomes form _____.
- muscle cells
- Sclerotomes form _____.
- vertebrae and ribs
- The ____ mesoderm form the kidneys and gonads
- intermediate
- The lateral mesoderm seperates into 2 layers forming the ____.
- inraembryonic coelom
- The ___ layer is continuous with the extraembryonic mesoderm surrounding the amnion, while the ____ layer is continuous with the extraembryonic mesoderm surrounding the yolk sac.
- somatic or parietal, visceral or splanchnich
- The somatopleura or embryonic body wall is formed from the ____ and ____.
- somatic mesoderm, overlying ectoderm
- The embryonic gut wall or splanchnopleura is formed from the ____ and _____.
- splanchnic mesoderm, endoderm
- The intraembryonic coelom divides into the ____, _____, and ____.
- pleural, pericardial, peritoneal cavities
- Blood vessels form only in ___ tissue.
- mesoderm
- Connective tissue, cartilage and bone except in the head and neck arise from _____.
- mesoderm
- Striated, smooth and cardiac muscle arise from the ____.
- mesoderm
- Blood cells, wall of the heart, blood and lymph vessels arise from the ____.
- mesoderm
- Kidney arise from the _____.
- intermediate mesoderm
- Gonads and their ducts arise from the ____.
- mesoderm
- Cortex of the adrenal glands arise from the ____.
- mesoderm
- The spleen arises from the ____.
- mesoderm
- The septum transversium gives rise to part of the ____.
- diaphragm ( mesodermal)
- A portion of the yolk sac is enclosed within the embryo forming the ____.
- foregut
- The allantosis, an outpouching of the ____ is folded under the embryo forming the ____.
- endoderm, forgut
- The epithelial lining of the primitive gut and intraembryonic portions of the alantosis and yolk sac arise from the ____.
- endoderm
- The epithelial lining of the respiratory tract arise from the ____.
- endoderm
- The parenchyma of the tonsils and thyroid gland arise from the ____.
- endoderm
- The parathyroid gland arises from the ___.
- endoderm
- Thymus, liver and pancreas arise from the ____.
- endoderm
- The epithelial lining of the urinary bladder arises from the ____.
- endoderm
- The urethra arises from the ____.
- endoderm
- The epithelial lining of the tympanic cavity and auditory tube arise from the ___.
- endoderm
- The epithelium and glands of the gut arise from the ___.
- endoderm
- ___ is vessels arising from blood islands.
- Vasculogenesis
- ___ is new vessels arising from exisiting vessels.
- angiogenesis
- Blood islands plus FGF2 produce _____.
- hemangioblasts
- Hemangioblasts with VEGF cause _____.
- tube formation