What is a neural groove?
Medical Definition of neural groove : the median dorsal longitudinal groove formed in the vertebrate embryo by the neural plate after the appearance of the neural folds. — called also medullary groove.
What is early development of frog?
A female frog lays eggs in the water, which are fertilized by sperm from a male frog. The resulting zygote goes through embryonic development to become a free-living tadpole, which then metamorphoses into an adult frog—for instance, by losing its tail through programmed cell death, or apoptosis.
What structures will form from the neural fold of the frog embryo?
The neural tube eventually develops into the brain and spinal cord.
What type of cleavage occurs in frog?
Cleavage in most frog and salamander embryos is radially symmetrical and holoblastic, just like echinoderm cleavage. The amphibian egg, however, contains much more yolk. This yolk, which is concentrated in the vegetal hemisphere, is an impediment to cleavage.
What is the function of neural groove?
definite gutterlike formation called the neural groove, which is the first indication of the future central nervous system. Beneath the groove, the mesodermal head process presently rounds into an axial rod, the notochord, that serves as a temporary “backbone.” By the end of the third week, a head fold, paired…
What does the neural groove become?
A shallow neural groove develops in the primitive ectoderm and later becomes covered, thus forming the neural tube. The midbrain, brain stem and cerebellum develop by further cell proliferation at the cranial end of the neural tube, while the caudal section develops into a spinal cord.
What is embryo of frog?
The frog egg is a huge cell; its volume is over 1.6 million times larger than a normal frog cell. During embryonic development, the egg will be converted into a tadpole containing millions of cells but containing the same amount of organic matter. The upper hemisphere of the egg — the animal pole — is dark.
What are the neural folds?
In humans, the neural folds are responsible for the formation of the anterior end of the neural tube. The neural folds are derived from the neural plate, a preliminary structure consisting of elongated ectoderm cells. The folds give rise to neural crest cells, as well as bringing about the formation of the neural tube.
How does the neural tube fold?
Primary neurulation begins after the neural plate forms. The edges of the neural plate start to thicken and lift upward, forming the neural folds. The neural folds pinch in towards the midline of the embryo and fuse together to form the neural tube.
Which organ is developed first in the frog embryology?
Organogenesis begins when the notochord—a rod of mesodermal cells in the most dorsal portion of the embryo—tells the ectodermal cells above it that they are not going to become skin. Rather, these dorsal ectoderm cells are to form a tube and become the nervous system. At this stage, the embryo is called a neurula.
How can you differentiate between the animal and vegetal poles in the early frog embryo?
In some cases, the animal pole is thought to differentiate into the later embryo itself, forming the three primary germ layers and participating in gastrulation. In the frog Xenopus laevis the animal pole is heavily pigmented while the vegetal pole remains unpigmented.
What is the late development of the frog?
Late development of the frog ovary. Small ovarian egg of the frog surrounded by its follicle. Development of the frog (Rana pipiens) from the yolk plug stage to the neurula. Relation of the spinal and the sympathetic nervous systems. Brain of the adult frog. Sagittal section through the anterior end of the 8 mm frog larva.
What kind of system does a frog have?
Urogenital system of the male frog. Late development of the frog ovary. Small ovarian egg of the frog surrounded by its follicle. Development of the frog (Rana pipiens) from the yolk plug stage to the neurula. Relation of the spinal and the sympathetic nervous systems. Brain of the adult frog.
Where does spermatogenesis take place in a frog?
Spermatogenesis in the frog, Rana pipiens. Spermatogenetic stages in the seminiterous tubule of the frog testis. Frog spermatozoon. Kidney of the male frog during amplexus. Brain regions for the mediation of sexual behaviour. Urogenital system of the male frog. Late development of the frog ovary.