Download Basal body

Cap 47. Desarrollo Animal
Dra. Millie L. González
Figure 47.1
1 mm
Figure 47.2
EMBRYONIC DEVELOPMENT
Sperm
Zygote
Adult
frog
Egg
Metamorphosis
Blastula
Larval
stages
Gastrula
Tail-bud
embryo
Figure 47.3-1
Basal body
(centriole)
Sperm
head
Acrosome
Jelly coat
Sperm-binding
receptors
Vitelline layer
Egg plasma membrane
Figure 47.3-2
Basal body
(centriole)
Sperm
head
Acrosome
Jelly coat
Sperm-binding
receptors
Hydrolytic enzymes
Vitelline layer
Egg plasma membrane
Figure 47.3-3
Sperm
nucleus
Basal body
(centriole)
Sperm
head
Acrosome
Jelly coat
Sperm-binding
receptors
Acrosomal
process
Actin
filament
Hydrolytic enzymes
Vitelline layer
Egg plasma membrane
Figure 47.3-4
Sperm
plasma
membrane
Sperm
nucleus
Basal body
(centriole)
Sperm
head
Acrosome
Jelly coat
Sperm-binding
receptors
Acrosomal
process
Actin
filament
Fused
plasma
membranes
Hydrolytic enzymes
Vitelline layer
Egg plasma membrane
Figure 47.3-5
Sperm
plasma
membrane
Sperm
nucleus
Basal body
(centriole)
Sperm
head
Acrosome
Jelly coat
Sperm-binding
receptors
Fertilization
envelope
Acrosomal
process
Actin
filament
Cortical
Fused
granule
plasma
membranes
Hydrolytic enzymes
Perivitelline
space
Vitelline layer
Egg plasma membrane
EGG CYTOPLASM
Figure 47.4
EXPERIMENT
10 sec after
fertilization
25 sec
35 sec
1 min
10 sec after
fertilization
20 sec
30 sec
500 m
RESULTS
1 sec before
fertilization
CONCLUSION
Point of sperm
nucleus
entry
Spreading
wave of Ca2
Fertilization
envelope
500 m
Figure 47.4a
EXPERIMENT
10 sec after
fertilization
25 sec
35 sec
1 min
10 sec after
fertilization
20 sec
30 sec
500 m
RESULTS
1 sec before
fertilization
500 m
Figure 47.4b
CONCLUSION
Point of sperm
nucleus
entry
Spreading
wave of Ca2
Fertilization
envelope
Figure 47.5
Zona pellucida
Follicle cell
Sperm
basal body
Sperm
nucleus
Cortical
granules
Figure 47.6
50 m
(a) Fertilized egg
(b) Four-cell stage (c) Early blastula
(d) Later blastula
Figure 47.7
Zygote
2-cell
stage
forming
Gray crescent
0.25 mm
8-cell stage (viewed
from the animal pole)
4-cell
stage
forming
8-cell
stage
Animal
pole
0.25 mm
Blastula (at least 128 cells)
Vegetal pole
Blastula
(cross
section)
Blastocoel
Figure 47.7a-5
Animal pole
Gray crescent
Zygote
2-cell stage
forming
Blastocoel
Vegetal pole
4-cell stage
forming
8-cell stage
Blastula
(cross section)
Figure 47.8
ECTODERM (outer layer of embryo)
• Epidermis of skin and its derivatives (including sweat glands,
hair follicles)
• Nervous and sensory systems
• Pituitary gland, adrenal medulla
• Jaws and teeth
• Germ cells
MESODERM (middle layer of embryo)
• Skeletal and muscular systems
• Circulatory and lymphatic systems
• Excretory and reproductive systems (except germ cells)
• Dermis of skin
• Adrenal cortex
ENDODERM (inner layer of embryo)
• Epithelial lining of digestive tract and associated organs
(liver, pancreas)
• Epithelial lining of respiratory, excretory, and reproductive tracts
and ducts
• Thymus, thyroid, and parathyroid glands
Figure 47.9
Animal
pole
Blastocoel
Mesenchyme
cells
Vegetal plate
Vegetal
pole
Blastocoel
Filopodia
Mesenchyme
cells
Blastopore
Archenteron
50 m
Blastocoel
Ectoderm
Key
Future ectoderm
Future mesoderm
Future endoderm
Mouth
Mesenchyme
(mesoderm forms
future skeleton)
Archenteron
Blastopore
Digestive tube (endoderm)
Anus (from blastopore)
Figure 47.9a-5
Blastocoel
Animal
pole
Mesenchyme
cells
Filopodia
Vegetal Vegetal
pole
plate
Archenteron
Blastocoel
Archenteron
Key
Future ectoderm
Future mesoderm
Future endoderm
Digestive tube
(endoderm)
Ectoderm
Blastopore
Mouth
Mesenchyme
(mesoderm forms
future skeleton)
Anus
(from blastopore)
Figure 47.9b
Blastocoel
Filopodia
Mesenchyme
cells
Blastopore
Archenteron
50 m
Figure 47.10
1
CROSS SECTION
SURFACE VIEW
Animal pole
Blastocoel
Dorsal
lip of
blastopore
Early
Vegetal pole
gastrula
Blastopore
Blastocoel
shrinking
2
3
Blastocoel
remnant
Dorsal
lip of
blastopore
Archenteron
Ectoderm
Mesoderm
Endoderm
Key
Future ectoderm
Future mesoderm
Future endoderm
Late
gastrula
Blastopore
Blastopore
Yolk plug
Archenteron
Figure 47.11
Fertilized egg
Primitive
streak
Embryo
Yolk
Primitive streak
Epiblast
Future
ectoderm
Blastocoel
Migrating
cells
(mesoderm)
Endoderm
Hypoblast
YOLK
Figure 47.12
1 Blastocyst reaches uterus.
Uterus
Endometrial epithelium
(uterine lining)
Inner cell mass
Trophoblast
Blastocoel
2 Blastocyst implants
(7 days after fertilization).
Expanding region of
trophoblast
Maternal
blood
vessel
Epiblast
Hypoblast
Trophoblast
3 Extraembryonic membranes
start to form (10–11 days),
and gastrulation begins
(13 days).
Expanding region of
trophoblast
Amniotic cavity
Epiblast
Hypoblast
Yolk sac (from hypoblast)
Extraembryonic mesoderm cells
(from epiblast)
Chorion (from trophoblast)
4 Gastrulation has produced a
three-layered embryo with
four extraembryonic
membranes.
Amnion
Chorion
Ectoderm
Mesoderm
Endoderm
Yolk sac
Extraembryonic mesoderm
Allantois
Figure 47.12a
Endometrial epithelium
(uterine lining)
Uterus
Inner cell mass
Trophoblast
Blastocoel
1 Blastocyst reaches uterus.
Figure 47.12b
Expanding region of
trophoblast
Maternal
blood
vessel
Epiblast
Hypoblast
Trophoblast
2 Blastocyst implants
(7 days after fertilization).
Figure 47.12c
Expanding region of
trophoblast
Amniotic cavity
Epiblast
Hypoblast
Yolk sac (from hypoblast)
Extraembryonic mesoderm
cells (from epiblast)
Chorion (from trophoblast)
3 Extraembryonic membranes
start to form (10–11 days),
and gastrulation begins
(13 days).
Figure 47.12d
Amnion
Chorion
Ectoderm
Mesoderm
Endoderm
Yolk sac
Extraembryonic mesoderm
Allantois
4 Gastrulation has produced a
three-layered embryo with
four extraembryonic
membranes.
Figure 47.13
Eye
Neural folds
Neural
fold
Tail bud
Neural plate
SEM
1 mm
Neural
fold
Somites
Neural tube
Neural
plate
Notochord
Neural
crest cells
1 mm
Neural
crest
cells
Coelom
Notochord
Somite
Ectoderm
Mesoderm
Endoderm
Neural
crest cells
Outer layer
of ectoderm
Archenteron
(a) Neural plate formation
Neural
tube
(b) Neural tube formation
Archenteron
(digestive
cavity)
(c) Somites
Figure 47.15-1
Ectoderm
Figure 47.15-2
Ectoderm
Neural
plate
Microtubules
Figure 47.15-3
Ectoderm
Neural
plate
Microtubules
Actin
filaments
Figure 47.15-4
Ectoderm
Neural
plate
Microtubules
Actin
filaments
Figure 47.14
Neural tube
Notochord
Eye
Forebrain
Somite
Coelom
Endoderm
Mesoderm
Ectoderm
Archenteron
Lateral
fold
Heart
Blood
vessels
Somites
Yolk stalk
These layers
form extraembryonic
membranes.
(a) Early organogenesis
Yolk sac
Neural
tube
YOLK
(b) Late organogenesis
Figure 47.15-5
Ectoderm
Neural
plate
Microtubules
Actin
filaments
Neural tube