Developmental Biology Study Notes

<p>Day 28. (A)</p> Signup and view all the answers

<p>It rolls up and separates from the yolk sac. (B)</p> Signup and view all the answers

<p>Invading the uterine cavity (C)</p> Signup and view all the answers

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

<p>It determines the body plan and induces the CNS to form (A)</p> Signup and view all the answers

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

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

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

<p>Formation of the brain and spinal cord (A)</p> Signup and view all the answers

<p>By 3 months (C)</p> Signup and view all the answers

<p>They provide support for the closure of the neural tube. (A)</p> Signup and view all the answers

<p>Neurons in the central nervous system (A)</p> Signup and view all the answers

<p>Day 20 (D)</p> Signup and view all the answers

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

<p>35 (A)</p> Signup and view all the answers

<p>Myotome (C)</p> Signup and view all the answers

<p>It is one of the last structures to close. (B)</p> Signup and view all the answers

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

<p>1st trimester (D)</p> Signup and view all the answers

<p>Prevents multiple sperm from entering (D)</p> Signup and view all the answers

<p>It is likely that other tissues are also affected. (A)</p> Signup and view all the answers

<p>In the fallopian tube (D)</p> Signup and view all the answers

<p>It gives rise to every cell in the body. (C)</p> Signup and view all the answers

<p>The result is conjoined twins. (A)</p> Signup and view all the answers

<p>It indicates linked defects in multiple tissues. (B)</p> Signup and view all the answers

<p>Remains unchanged in size despite cell divisions. (C)</p> Signup and view all the answers

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

<p>Endoderm (D)</p> Signup and view all the answers

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

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

<p>Day 19 (C)</p> Signup and view all the answers

<p>Gives rise to neural tube and related structures (A)</p> Signup and view all the answers

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

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

Process transforming a bilaminar disc (2 layers) into a trilaminar embryo (3 layers) by forming the primitive streak and germ layers.

A groove that forms in the epiblast at day 15/16, defining the embryo's development direction.

Ectoderm, mesoderm, and endoderm; the three fundamental layers formed during gastrulation, which give rise to different parts of the body.

A structure important for neural tube formation. It induces ectoderm to become neural.

The process of the neural tube forming from the neural plate.

A two-layered structure in the early embryo that develops into the trilaminar embryo.

A part of the placenta that penetrates the uterus and enables embryo implantation

A hormone produced during pregnancy that can be used for pregnancy detection

Early stage of embryonic development, a flat sheet of cells with two layers.

Movement of the primitive streak back toward its origin at the bottom of the embryo by day 21.

Process creating the central nervous system (CNS) by the folding of the neural plate.

Cells formed at the crest of neural folds; migrate and form various tissues.

Thickened region of the ectoderm; precursor to the neural tube.

The process of the embryo forming during the first 8 weeks after fertilization.

The process of forming organs during embryonic development.

The union of sperm and egg to form a zygote.

The cell formed by the union of sperm and egg.

The part of the blastocyst that develops into the embryo.

Twins formed from the same fertilized egg (zygote).

A genetic condition affecting heart and hand development due to a mutation affecting both.

Fallopian tube, specifically the ampulla.

These folds form during embryonic development, tucking the heart ventrally, pinching off the gut tube from the yolk sac, and narrowing the body stalk. The head fold bends down, and the tail fold bends inwards. These folds contribute to the formation of the umbilical cord.

This process transforms the flat embryonic disc into a 3D cylinder. It rolls up the gut tube, separating it from the yolk sac, and encloses the embryo completely except at the body stalk (forming the umbilical cord).

This cavity surrounds the developing embryo except at the body stalk, which later forms the umbilical cord. It provides a protective environment for the embryo.

This structure connects the embryo to the uterus during early development. It is later transformed into the umbilical cord.

The umbilical cord forms from the body stalk, which is the connection between the early embryo and the uterus. This stalk shrinks and becomes the cord, which connects the baby to the placenta.

Cells responsible for forming dentin, the hard tissue beneath enamel in teeth.

Blocks of mesoderm that form on either side of the neural tube during embryonic development. They give rise to muscles, vertebrae, cartilage, tendons, and skin.

Part of a somite that forms cartilage, tendons, and the vertebral column.

Part of a somite that forms muscle precursors.

Part of a somite that forms skin precursors.

The process where the neural folds meet in the midline, forming a closed tube that develops into the brain and spinal cord.

A thickened patch of ectoderm that will eventually form the inner ear.

A bulge on the embryo's surface that will develop into the heart.