cell to embryo + full term fetus and placenta

Fertilization of secondary oocyte by sperm cell

Penetration of a secondary oocyte by a sperm cell.

Cleavage (cell division at the 4-cell stage)

Division of the ovum into two or more cells.

Morula

Multi-cell stage of embryonic development

Embryonic vesicle (highly schematic)

embryo at the stage of uterine implantation.

Ovary (coronal section, stroma and associated components)

The glands which produce ova

Primary oocyte

Developing primary follicle

Secondary follicle

Holds the maturing oocyte.

Graafian follicle

holds maturing oocyte

Corpus luteum

Produces progesterone.

Corpus albicans

Degenerative product of corpus luteum.

Secondary oocyte discharged from follicle

Secondary oocyte just released by the ovary.

Fimbriated end of oviduct (fallopian tube)

Draws the ovulated oocyte into the uterine tube proper.v

Oviduct (fallopian tube)

site of fertilization.

Corpus of uterus

Incubation

Fundus of uterus

Incubation

Myometrium or muscle layers of uterus

Muscle layers of uterus

Cervix

Incubation

Endometrium (highly vascular mucous membrane)

site of implantation

Vagina

birth canal

Zona pellucida of secondary oocyte

protection of secondary oocyte

Corona radiata of secondary oocyte

Supply vital proteins to the ovum

Sperm cell

Male reproductive gamete (haploid chromosome number, n (n=23))

Amnion of developing embryo

Protection of the fetus

Embryonic disk

Two-layered flat stage of embryonic development

Yolk sac of developing embryo

Contains nutrients for growing embryo

Embryonic placenta (trophoblast tissue)

attaches embryo to uterus

Amnion and amniotic cavity/ amniotic fluid

protection

Yolk sac

A membranous sac containing nutrient material for the embryo

Yolk sac stalk

A constriction that pinches the yolk sac off from the embryo

Allantoic diverticulum

Allantois, origins of tissues of urinary bladder

Body stalk

Developing umbilical cord

Extra embryonic coelom (cavity)

The body cavity which encloses the viscera

Chorion

Protection of embryo

Chorionic villi

Finger-like projections which bring fetal blood to site of exchange of gases and nutrients with mothers blood

belly stalk

developing umbical cord

forebrain, midbrain, and hindbrain area

developing brain

heart prominence

developing embryonic heart

liver prominence

developing embryonic liver

Umbilical cord

cord that contains the umbilical arteries and vein that connects the fetus to the placenta.

Placenta (cut surface)

facilitates the exchange of materials between a fetus and the maternal circulation.

Amniotic sac (filled with amniotic fluid)

A thin membrane that holds the fetus in amniotic fluid.

Cervix or neck of Uterus

incubation of embryo.

Fornix of the vagina

A recess around the cervix of the uterus where it protrudes into the vagina.

Pubic symphysis

The joint between the two coxal bones forming the front arch of pelvis

Sacrum (cut surface)

Five fused vertebrae forming the posterior attachment of the pelvis with the vertebral column

Coccyx (cut surface) with sacrum

The fused bones at the end of the vertebral column

Colon (sigmoid)

The large intestine.

Rectum

The last 20cm of the colon between the sigmoid and anus

Anus

The distal end of the large intestine which closes the rectum

Linea alba (ligament/fascia of rectus abdominalis muscle)

A layer of ligament between rectus abdominalis muscle

Cauda equina (sacral nerve bundle)

A collection of nerve roots found at the sacrum

Lumbar vertebrae

The vertebrae that make up the 'lower back' portion of the vertebral column

Umbilical vein

Brings oxygenated blood to embryo

Umbilical arteries

Brings deoxygenated blood to placenta

Decidua basalis compacta (compact deciduous layer containing blood vessels)

Compact deciduous layer of the Endometrium modified for pregnancy and shed after childbirth

Decidua basalis spongiosa (spongy deciduous layer)

Spongy deciduous layer of the Endometrium modified for pregnancy and shed after childbirth