أسئلة المحاضرة السابعة امبريولوجي (قبل التعديل)

<p>Ganglia (A)</p> Signup and view all the answers

<p>Anencephaly (B)</p> Signup and view all the answers

<p>Prevents 70% of defects (B)</p> Signup and view all the answers

<p>Rapid growth of the neural tube (C)</p> Signup and view all the answers

<p>Alpha-fetoprotein levels and ultrasound (D)</p> Signup and view all the answers

<p>It induces the formation of the neural plate. (A)</p> Signup and view all the answers

<p>Neural tube (A)</p> Signup and view all the answers

<p>It is typically asymptomatic. (A)</p> Signup and view all the answers

<p>On the 25th day (D)</p> Signup and view all the answers

<p>Melanocytes (B)</p> Signup and view all the answers

<p>Absent skull and most brain parts (D)</p> Signup and view all the answers

<p>Development of the neural tube and mesoderm (B)</p> Signup and view all the answers

<p>Folic acid supplementation (C)</p> Signup and view all the answers

<p>The notochord acts as an inducer for neurulation, signaling the ectoderm to thicken and form the neural plate.</p> Signup and view all the answers

<p>During the fusion, the elevated edges of the neural plate converge and form the neural tube.</p> Signup and view all the answers

<p>The caudal neuropore closes on the 27th day, and its closure is crucial to prevent defects in the lower spinal cord.</p> Signup and view all the answers

<p>Spina bifida can be classified as occulta, meningocele, or meningomyelocele, with occulta being asymptomatic.</p> Signup and view all the answers

<p>Folic acid (vitamin B9) supplementation helps prevent neural tube defects by promoting proper neural tube closure.</p> Signup and view all the answers

<p>Anencephaly results in the absence of a skull and brain parts due to the failure of cranial neuropore closure.</p> Signup and view all the answers

<p>Embryonic folding occurs as the trilaminar embryo folds ventrally due to the rapid growth of the neural tube and mesoderm.</p> Signup and view all the answers

<p>Neural crest cells give rise to ganglia, Schwann cells, and melanocytes, serving functions such as nerve signal transmission and pigmentation.</p> Signup and view all the answers

<p>Neural crest cells give rise to various structures, including ganglia, Schwann cells, and melanocytes.</p> Signup and view all the answers

<p>During neurulation, the neural plate elevates to form neural folds and creates a neural groove.</p> Signup and view all the answers

<p>Spina bifida is characterized by incomplete closure of the caudal neuropore, leading to spinal cord defects.</p> Signup and view all the answers

<p>Anencephaly results from this failure, leading to the absence of most of the brain.</p> Signup and view all the answers

<p>The notochord acts as an inducer for neurulation, signaling the ectoderm to thicken and form the neural plate.</p> Signup and view all the answers

<p>The cranial neuropore closes on the 25th day of development, marking the completion of an essential stage in neural development.</p> Signup and view all the answers

<p>Folic acid supplementation during pregnancy can prevent approximately 70% of neural tube defects.</p> Signup and view all the answers

<p>One outcome could be the diagnosis of spina bifida through elevated alpha-fetoprotein levels.</p> Signup and view all the answers

The development of the nervous system, guided by the notochord, where the ectoderm thickens to form the neural tube and neural crest.

The central ectoderm elevates to form neural folds, which fuse to become the neural tube forming neural tissue.

A collection of cells that migrate and differentiate into various tissues like neurons, connective tissues, and pigment cells.

The neural tube forms the brain and spinal cord.

Birth defects caused by incomplete closure of the neural tube during embryonic development.

A neural tube defect that leads to the absence of the brain and parts of the skull.

A neural tube defect characterized by incomplete closure of the caudal neuropore, often affecting the spinal column.

A rod-like structure that induces the formation of the neural tube during neurulation.

The central part of the ectoderm thickens to form a neural plate, which is the precursor to the nervous system.

The edges of the neural plate elevate and bend upwards to create neural folds, which eventually fuse together.

The central depressed area between the neural folds forms the neural groove.

From the fusion of the neural folds, the neural tube is formed. This structure will develop into the brain and spinal cord.

These cells originate from the lateral edges of the neural plate at its junction with the rest of the ectoderm. They migrate and differentiate to form a variety of tissues throughout the body.

Folic acid (vitamin B9) supplementation during pregnancy can prevent 70% of neural tube defects.

The process of forming the nervous system from the ectoderm, guided by the notochord. It involves the neural plate, folds, and tube development.

The notochord is the inducer that signals the ectoderm to thicken and form the neural plate, leading to neural tube formation.

The neural crest, located at the edges of the neural plate, gives rise to various cell types like neurons, pigment cells, and connective tissues.

Incomplete closure of the neural tube during embryonic development can lead to birth defects like anencephaly and spina bifida.

A severe neural tube defect where the brain and parts of the skull are absent, resulting in incompatibility with life.

A neural tube defect where the spinal column doesn't close completely, leading to different types of severity.

Folic acid (vitamin B9) supplementation during pregnancy can reduce the risk of neural tube defects by 70%.

The bending of the trilaminar embryo upon itself ventrally, occurring in the 4th week due to rapid growth of the neural tube and mesoderm.

Folic acid (vitamin B9) supplementation during pregnancy can reduce the risk of neural tube defects by 70%.

The bending of the trilaminar embryo upon itself ventrally, occurring in the 4th week due to rapid growth of the neural tube and mesoderm.