2011 Lab 12 - Embryo to Fetus: Difference between revisions

Latest revision as of 20:42, 18 October 2011

Introduction

Week 8 Stage 22 and 23
Selected Stage 22 cross-sections and animations
Week 10 Fetus

Week 8 Stage 22

Week 8, 54 - 56 days, 23 - 28 mm

Mesoderm: heart prominence, ossification continues

Head: nose, eye, external acoustic meatus

Body:straightening of trunk, heart, liver, umbilicus: placental cord, midgut herniation, allantois, vitelline duct

Limb: upper limbs longer and bent at elbow, foot plate with webbed digits, wrist, hand plate with separated digits

Straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, ear auricle, scalp vascular plexus, separated digits (fingers), thigh, ankle, umbilical cord

Embryo Anatomy

Now examine selected regions of the Stage 22 embryo and their overall development in the 3D animations.

Head Region
Shoulder Region
Chest Region
Abdomen Region
Hip Region


Gastrointestinal	Cardiovascular	Central Nervous	Urogenital	Skeletal

Links: 3D reconstruction animations | embryo slices

Week 8 Stage 23

Week 8, 56 - 60 days, 27 - 31 mm

scalp vascular plexus, eylid, eye, nose, auricle of external ear, mouth, sholder, arm, elbow, wrist, toes separated, sole of foot, umbilical cord

Mesoderm: ossification continues

Head: eyelids, external ears, rounded head

Body: straightening of trunk, intestines herniated at umbilicus

Limbs: hands and feet turned inward

Week 10 Fetus (40mm)

This is an image of the actual size comparison shown in the introduction of the Embryonic stage 13, 23 and Fetal stage 10 week 40mm. This stage of development is after the embryonic period (up to week 8), but only 2 weeks into early fetal development.

The fetal period is a time of extensive growth in size and mass as well as differentiation of organ systems established in the embryonic period. In particular, the brain continues to grow and develop, the respiratory system differentiates, the urogenital system further differentiates between male/female, endocrine and gastrointestinal tract begins to function.

Compare this 10 week fetus with the earlier Carnegie stage embryos: size, head/body proportions, brain, head, skeletal development.

Note that in the early fetus the midgut remains herniated and will only be taken into the peritoneal cavity on further body wall growth.

There are 4 sections taken in the sagittal plane (moving from the right at Plane A towards the midline at Plane D). Click on the small images (or the text below) to open the linked large image pages.

Plane A
Plane B
Plane C
Plane D

Midgut Herniation

Glossary Links

Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link

Cite this page: Hill, M.A. (2024, April 19) Embryology 2011 Lab 12 - Embryo to Fetus. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2011_Lab_12_-_Embryo_to_Fetus

What Links Here?

@@ Line 1: / Line 1: @@
 {{2011Lab12}}
+==Introduction==
+* Week 8 Stage 22 and 23
+* Selected Stage 22 cross-sections and animations
+* Week 10 Fetus
+==Week 8 Stage 22==
+{|
+| [[File:Stage22 bf1c.jpg|left]]
+| Week 8, 54 - 56 days, 23 - 28 mm
+Mesoderm: heart prominence, ossification continues
+Head: nose, eye, [[E#external acoustic meatus|external acoustic meatus]]
+Body:straightening of trunk, heart, liver, umbilicus: placental cord, midgut herniation, allantois, vitelline duct
+Limb: upper limbs longer and bent at elbow, foot plate with webbed digits, wrist, hand plate with separated digits
+Straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, ear auricle, [[S#scalp vascular plexus|scalp vascular plexus]], separated digits (fingers), thigh, ankle, umbilical cord
+|}
+===Embryo Anatomy===
+Now examine selected regions of the Stage 22 embryo and their overall development in the 3D animations.
+<gallery>
+File:Embryo stage 22 B5L.jpg|Head Region
+File:Embryo stage 22 C7L.jpg|Shoulder Region
+File:Embryo stage 22 E3L.jpg|Chest Region
+File:Embryo stage 22 F1L.jpg|Abdomen Region
+File:Embryo stage 22 G5L.jpg|Hip Region
+</gallery>
+{| border='0px'
+|-
+| [[File:Stage22-GIT-icon.jpg|90px|link=Movie_-_Gastrointestinal_Tract_3D_stage_22]]
+| [[File:Stage22-CVS-icon.jpg|90px|link=Movie_-_Cardiovascular_3D_stage_22]]
+| [[File:Stage22-CNS-icon.jpg|90px|link=Movie_-_Central_Nervous_System_3D_stage_22]]
+| [[File:Stage22-UG-icon.jpg|90px|link=Movie_-_Urogenital_System_3D_stage_22]]
+| [[File:Stage22-SK-icon.jpg|90px|link=Movie_-_Skeletal_System_3D_stage_22]]
+|-
+| [[Movie_-_Gastrointestinal_Tract_3D_stage_22|Gastrointestinal]]
+| [[Movie_-_Cardiovascular_3D_stage_22|Cardiovascular]]
+| [[Movie_-_Central_Nervous_System_3D_stage_22|Central Nervous]]
+| [[Movie_-_Urogenital_System_3D_stage_22|Urogenital]]
+| [[Movie_-_Skeletal_System_3D_stage_22|Skeletal]]
+|-
+|}
+:'''Links:''' [[Movies_-_Embryo_Carnegie_stage_22|3D reconstruction animations]] | [http://embryology.med.unsw.edu.au/wwwhuman/lowpower/HumA/A1L.htm embryo slices]
+==Week 8 Stage 23==
+{|
+| [[File:Stage23_bf1c.jpg|left]]
+| Week 8, 56 - 60 days, 27 - 31 mm
+scalp vascular plexus, eylid, eye, nose, auricle of external ear, mouth, sholder, arm, elbow, wrist, toes separated, sole of foot, umbilical cord
+Mesoderm: ossification continues
+Head: eyelids, external ears, rounded head
+Body: straightening of trunk, intestines herniated at umbilicus
+Limbs: hands and feet turned inward
+|}
+==Week 10 Fetus (40mm)==
+{|
+| [[File:Size_comparison_embryo-fetus_actual.jpg]]
+| This is an image of the actual size comparison shown in the introduction of the Embryonic stage 13, 23 and Fetal stage 10 week 40mm. This stage of development is after the embryonic period (up to week 8), but only 2 weeks into early fetal development.
+|-
+| [[File:Size_comparison_embryo-fetus.jpg]]
+| The fetal period is a time of extensive growth in size and mass as well as differentiation of organ systems established in the embryonic period. In particular, the brain continues to grow and develop, the respiratory system differentiates, the urogenital system further differentiates between male/female, endocrine and gastrointestinal tract begins to function.
+Compare this 10 week fetus with the earlier Carnegie stage embryos: size, head/body proportions, brain, head, skeletal development.
+Note that in the early fetus the midgut remains herniated and will only be taken into the peritoneal cavity on further body wall growth.
+|}
+There are 4 sections taken in the sagittal plane (moving from the right at Plane A towards the midline at Plane D). Click on the small images (or the text below) to open the linked large image pages.
+<gallery>
+File:Human- fetal week 10 sagittal plane A.jpg|Plane A
+File:Human- fetal week 10 sagittal plane B.jpg|Plane B
+File:Human- fetal week 10 sagittal plane C.jpg|Plane C
+File:Human- fetal week 10 sagittal plane D.jpg|Plane D
+</gallery>
+[[File:Fetal_10wk_urogenital_3.jpg|600px]]
+'''Midgut Herniation'''
 {{2011Lab12}}