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ANAT UNIT 1 FINAL

INTRO TO DEVELOPMENT: GAMETES TO THE TRILAMINAR EMBRYO

QuestionAnswer
What is the only cell in the male gamete production cycle that divides by mitosis? SPERMATOGONIA
Is a spermatogonia haploid or diploid? DIPLOID (46 CHROMOSOMES)
In the gamete production cycle a spermatagonium will divide via mitosis to become what two types of daughter cells? 1 SPERMATOGONIA AND 1 PRIMARY SPERMATOCYTE
Is a primary spermatocyte haploid or diploid? DIPLOID (46 CHROMOSOMES)
A primary spermatocyte will divide by meiosis and give rise to two daughter cells called: SECONDARY SPERMATOCYTES
Are secondary spermatocytes haploid or diploid? HAPLOID (23 CHROMOSOMES)
Two secondary spermatocytes divide via meiosis and give rise to four: SPERMATIDS
Are spermatids haploid or diploid? HAPLOID (23 CHROMOSOMES)
A spermatid develops into a mature spermatozoa through the process of: SPERMIOGENESIS
A baby boy is born with what type of gamete? SPERMATOGONIA
Oogonia divide by ____ in the fetal ovary. MITOSIS
Oogonia divide by mitosis and give rise to these cells: PRIMARY OOCTYES
A baby girl is born with what type of gamete? PRIMARY OOCTYES
Primary oocytes are arrested in what phase of development? (DIPLOTENE STAGE OF) PROPHASE I OF MEIOSIS
When does a secondary oocyte form? UPON MATURATION INTO AN OVUM WITHIN THE OVARIAN FOLLICLE, 10 HOURS PRIOR TO OVULATION.
The second meiotic division of the secondary oocyte occurs during what process? FERTILIZATION
Upon fertilization, two ___ are formed, each with its own nuclear envelope. PRONUCLEI
Fusion of the two pronuclei in the fertilized ovum give rise to the: ZYGOTE
Is the zygote haploid or diploid? DIPLOID (46 CHROMOSOMES)
What is the 16-cell stage of embryogenesis? MORULA
What is the 32-cell stage of embryogenesis? BLASTULA
What are the individual cells of the blastula called? BLASTOMERES
The blastula implants on what day after fertilization? DAY 6
By day 8 a fluid-filled space develops and an inner cell mass and an outer layer of cells called the trophoblast are visible. The blastula is now called a: BLASTOCYST
The inner cell mass is also called an ___ and will give rise to the embryo proper. EMBRYOBLAST
The embryoblast differentiates into two layers to form the: BILAMINAR EMBRYONIC DISC.
The layer of the embryonic disc adjacent to the amniotic cavity is the: EPIBLAST
The layer of the embryonic disc adjacent to the exocoelomic cavity is called the: HYPOBLAST
The exocoelomic cavity will give rise to the: YOLK SAC
The process of gastrulation gives rise to the: TRILAMINAR EMBRYO
In the trilaminar embryo, the epiblast will give rise to the embryonic ___. ECTODERM
In the trilaminar embryo, the hypoblast will give rise to the embryonic ___. YOLK SAC WALL
The cells at the margin of the epiblast and hypoblast of the trilmaniar embryo will give rise to the extraembryonic ___. MESODERM
This specialized collection of hypoblastic cells develops at a localized site at the margin of the bilaminar disc. PRECHORDAL PLATE
The prechordal plate determines this end of the embryo. CRANIAL END
During the third week, this longitudinal band of tissue develops in the midline of the epiblast at the caudal end of the embryonic disc. PRIMITIVE STREAK
The proliferation of cells at the cranial end of the primitive streak forms the: PRIMITIVE NODE
What groove develops in the midline of the primitive streak? PRIMITIVE GROOVE
The indentation in the primitive node is the: PRIMITIVE PIT
The embryonic mesoderm is derived from the: PRIMITIVE MESENCHYME
What determines the cranial-caudal midline of the embryo? THE NOTOCHORD
The notochord will give rise to the ___ canal. NOTOCHORDAL
By the end of the third week, the ectoderm overlying the notochord begins to thicken, forming this structure: NEURAL PLATE
The longitudinal groove that forms in the neural plate is the: NEURAL GROOVE
To review, embryonic spinal cord development in the hypoblast follows these six steps: PRECHORDAL PLATE → NOTOCHORDAL PROCESS → NOTOCHORDAL CANAL → NEURAL PLATE → NEURAL GROOVE → NEURAL TUBE
Embryonic spinal cord development in the epiblast follows these four steps: PRIMITIVE STREAK → PRIMITIVE GROOVE, PRIMITIVE NODE → PRIMITIVE PIT
The neural crests are derived from the: NEUROECTODERM CELLS
By Day 21 the following three tissue layers are formed: ECTODERM, MESODERM, ENDODERM
The ectoderm forms what? THE ENTIRE SURFACE OF THE EMBRYO
The mesoderm forms what? THE LINING OF THE BODY CAVITY AND SUSPENDS THE GUT TUBE
The endoderm forms what? THE GUT TUBE
The body cavities are derived from the: LATERAL PLATE MESODERM
Created by: AnatomyByDocRoxy