Lab 11- Embryonic and Fetal Development

Mature ovum

what is A?

Fertilization of ovum by sperm cell

what is B?

Cleavage (cell division at the four-cell stage)

what is C?

Morula (multi-cell stage of development)

what is D?

Embryonic vesicle (highly schematic)

what is E?

Developing embryo about 21 days

what is F?

Much enlarged embryo about 5th week

what is G?

Ovary (coronal section, stroma, and associated components)

what is #1?

Primary oocyte (developing ovum)

what is #2?

Oocyte with corona radiata

what is #3?

Developing fluid-filled vesicular follicles

what is #4?

Ovulating follicle

What is #5?

Corpus luteum

what is #6?

Corpus albicans (degenerative product of corpus luteum)

what is #7?

Mature ovum discharged from follicle

what is #8?

Fimbriated end of oviduct (Fallopian tube)

What is #9?

Ovum in oviduct with sperm ready to penetrate (fertilization first day; cf. B)

what is #10?

Oviduct (fallopian tube)

what is #11?

Cleavage of fertile ovum (cf. C)

what is #12?

Morula or multi-celled stage (third day: cf. D)

What is #13?

Embryonic vesicle enters uterus (fourth or fifth day)

What is #14?

Implantation of vesicle begins in endometrial epithelium (seventh day)

what is #15?

Corpus of uterus (frontal, mid-line section)

What is #16?

Fundus of uterus

What is #17?

Myometrium or muscle layers of uterus

what is #18?

Cervix or neck of uterus

what is #19?

Endometrium (highly vascular mucous membrane)

what is #20?

Vagina (frontal section)

what is #21?

Nucleus of ovum

what is #22?

Zona pellucida of ovum

what is #23?

Corona radiata of ovum

what is #24

Sperm cell

what is #25?

Yolk sac of developing embryo

what is #26?

Embryonic disk

What is #27?

Amnion of developing embryo

what is #28?

Embryonic placenta (trophoblast tissue)

what is #29?

Body of embryo

what is #30?

Amnion and amniotic cavity

what is #31?

Developing heart

what is #32?

Yolk sac

what is #33?

Yolk sac stalk

what is #34?

Allantoic diverticulum (allantois, origins of tissues of urinary bladder)

what is #35?

Body stalk

What is #36?

Extra embryonic coelom (cavity)

what is #37?

Chorion

what is #38?

Placental villi

what is #39?

Belly stalk (developing umbilical cord)

what is #40?

Forebrain area

what is #41?

Midbrain area

what is #42?

Hindbrain area

what is #43?

Eye

what is #44?

Developing outer ear

what is #45?

Heart prominence

what is #46?

Liver prominence

what is #47?

Differentiating somites

what is #48?

Tail

what is #49?

Notches between digital rays of hand

what is #50?

Toe rays (may be in evidence)

what is #51?

Embryo with membranes in situ

what is #52?

Embryo at six weeks (12 mm long crown to rump, inhuman appearance)

what is A.?

Fetus at eight weeks (Most organs are formed and it is now called a fetus, and has human appearance)

what is B.?

Fetus at 10 weeks (40 mm long, holds head erect)

what is C.?

Fetus at 12 weeks (sex can be seen, skeleton is ossifying, brain has general structure)

what is D.?

Fetus at 14 weeks (yolk sac detaches and deteriorates)

what is E.?

Fetus at 16 weeks (mother can feel movement, quickening)

what is F.?

Gravid uterus (mid-line sagittal section)

What is #1?

cervix or neck of uterus (section) (closed not dilated)

what is #2?

Amnion (section) or "water bag"

what is #3?

Placenta (section)

what is #4?

Umbilical cord

what is #5?

Vagina

what is #6?

Vaginal orifice

what is #7?

Labia minora (lesser lip of vulva)

what is #8?

Labia majora (greater lip of vulva)

what is #9?

Urinary bladder (compressed by fetus)

what is #10?

Urethra

what is #11?

Pubic symphysis

what is #12?

Fornix of the vagina

what is #13?

Colon (sigmoid)

what is #14?

Rectum

what is #15?

Anal canal

what is #16?

Colon (descending)

what is #17?

Ileum (small intestine)

what is #18?

Mesentery

what is #19?

Linea alba (ligament fascia between rectus muscle)

what is #20?

Fifth lumbar vertebra (section)

what is #21?

Sacrum (vertebral bones)

what is #22?

Coccyx bone

what is #23?

Cauda equina (sacral nerve bundle)

what is #24?

Fetus at full term ( 38 weeks gestation 6 ½ - 7 ½ lbs , 20 in long )

what is #1?

Umbilical cord

what is #2?

Placenta (cut surface)

what is #3?

Amniotic sac (filled with amniotic fluid)

what is #4?

Wall of uterus (cut surface)

what is #5?

Cervix or neck of uterus (slightly dilated 1-2 cm)

what is #6?

Plane of inlet of birth canal or upper opening of true pelvis includes the area between 7a located on pubic symphysis (16) and 7b located on vertebral column (28)

what is #7?

Plane out outlet of birth canal includes the area between 8a located at the tip of coccyx (18) and 8b located on the pubic symphysis (16). This is the narrowest part of the pelvis outlet through which the baby must pass

what is #8?

Tissues of the pelvic floor

what is #9?

Fornix of the vagina

what is #10?

Vagina

what is #11?