Question | Answer |
Once gastrulation has been completed | Organogenesis |
The formation of body systems, begins. Its first event is the formation of a dorsal rodlike thickening of mesodern called the | Nortochord |
which appears immediatley deep to the former | Primitive streak |
and establishes the longitudinal axis of the embryo. This is quickly followed by the process called | Neurulation |
which leads to the formation of the nervous system this process begins as the | Ectoderm |
lying superior to the notochord is induced to thicken and then to fold and detach as the neural tube. this is quickly followed by the specialization of the | Endoderm |
Early differentiation of the mesoderm is forecast by its division into three regions | Intermediate mesoderm Lateral plate mesodermsomites |
The limb buds and parietal serosa are formed by the somatic mesoderm part of the | lateral plate mesoderm |
Where as the cardiovascular system form from the splanchnic layer. The gonads arise from the | Intermediate mesoderm |
Part of the blastocyst that forms the embryonic body | Inner cell mass |
Formed by the delamination of endodermal cells ventral sac | Yolk sac |
Site of respiratory exchange | Placenta |
Attaches the embryo placenta | Allantois Umbilical cord |
Finger like projections of the trophoblast that are invaded by extraebryonic mesodern | Chorionic villi |
After thre months the source of estrogen and progesteronne during pregnancy | Placenta |
The organ that delivers nutrients to and disposes of waste for the fetus | Placenta |
Projection abutting the yolk sac that serves as a depository for wastes in animals that form large yolked egs | Allantois |
Tissue eroded during implantation | Endometrium |
A fertilized egg | Zgote |
Swollen Ovum and sperm nuclei | Pronuclei |
Process during which a sperm becomes capable of undergoing the acrosomal reaction | Capacitation |
Release of digestive enzymes by sperm in the immediate vicinity of oocyte | Acrosomal reaction |
Term applied to the developing infant from fertlization to the end of the eight week after fertilization | Embryo and conceptus |
Fusion of the ovum and sperm nuclei | Fertilization |
Cells resulting from cleavage | Blastomeres |
The one sperm per oocyte condition | Monospermy |
Period of rapid mitotic cell division that results in cells with a high surface to volume ratio | Cleavage |
A consequence of syncytiotrophoblast activity during which endometrial cells are digested | Implantation |
Event that constitutes a block to polyspermy | Cortical reaction |
Term appliied to the developing infant after the eight week | Fetus |
Initiated by rising levels of ionic calcium within the oocyte cytoplasm | Cortical reaction |
Helps sperm locate an ovulated oocyte | Olfactory receptors |
Marked by exacerbations and remiissions | Gental herpes |
Its destructive tertiary lesions are called gummas | Syphilis |
Most common symptom in males is urthritis and penile drip may be asymptomatic in females | Genital herpes |
Not recognized as a health problem until the 19970's accounts for 25% to 50% of all pelvic inflammatory disease | Chlamydia |
Congeniital forms can cause severe fetalmalformations | Genital herpes |
Newborns of infected mothers may have conjuctivitis and respiratory tract infection | Chlamydia |
Like AIDS a viral rather than a bacterial disease. | Genital Herpes |
Only diagnosed by cell culture techniques treated with tetracycline | Chlamydia |
Disease rountinely treated with penicillin | Syphilis |
Typically caused by human papilloma virus diffrent strains linked to invasive cervical cancer | Genital Herpes |
Absense causes the spiral arteries of the endometrium to go into spasms and kink and the endometrium to slough off | Estrogen Progesterone |
Causes the endometrial glands to begin secreting nutrients | Progesterone |
The endometrium is repaired and grows thick and velvety | Estrogen |
Maintains the myometrium in an inactive state if implantation of an embryo has occured | Progesterone |
Stimulates gland formatiion in the endometrium | Estrogen |
Responsible for the secondary sex characteristics of females | Estrogen |
Causes the cervical mucus to become viscous | Progesterone |
Organ that delivers semen to female reproductive tract | Penis |
Site of sperm and testosterone production | testes |
Passageway for conveying sperm from the epididymis to the ejaculatory duct | Ductus deferen |
Conveys both sperm and urine down the length of the penis | Urethra |
Organs that contribute to the formation of semen | bulborethral glands prostate seminal vesicle testes |
External skin sac that houses the testes | Scrotum |
Tubular storage site for sperm hugs the lateral aspect of the testes | Epididymis |
Cuff of the skin encircling the glans penis | Prepuce |
Surrounds the urethra at the base of the bladder produces a milky slightly acid fluid | Prostate |
Produces over half of seminal fluid | Seminal vesicles |
Empties a lubricating mucus into urethra | Bulborethral glands |
Conective tissue sheath enclosing the ductus deferens blood vessels and nerves | Spermatic cord |