BGDA Practical 7 - Week 5: Difference between revisions
mNo edit summary |
|||
Line 18: | Line 18: | ||
<gallery> | <gallery> | ||
File: | File:Stage14_sem1.jpg|Stage 14 | ||
File: | File:Stage15_bf1.jpg|Stage 15 | ||
</gallery> | </gallery> | ||
Line 68: | Line 68: | ||
|- | |- | ||
| [[File:Heart1_looping icon.jpg|90px|link= | | [[File:Heart1_looping icon.jpg|90px|link=Heart Looping Movie]] | ||
| [[File:Heart1_realign icon.jpg|90px|link= | | [[File:Heart1_realign icon.jpg|90px|link=Heart Realign Movie]] | ||
| [[File:Heart1_atrium icon.jpg|90px|link= | | [[File:Heart1_atrium icon.jpg|90px|link=Heart Atrial Septation Movie]] | ||
| [[File:heart1 ventricle icon.jpg|90px|link= | | [[File:heart1 ventricle icon.jpg|90px|link=Heart Outflow Septation Movie]] | ||
|- | |- | ||
| [[Development_Animation_-_Heart Looping|Heart Looping]] | | [[Development_Animation_-_Heart Looping|Heart Looping]] |
Revision as of 14:04, 19 May 2013
Introduction
Practical 6: Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 |
Key Events of Human Development during the fifth week (week 5) following fertilization or Clinical week 7 (LMP).
By this week there are many different organs and tissues differentiating throughout the embryo, only a few select systems will be discussed.
Cardiovascular
- Heart - septation starts, atrial septation and ventricular septation
- Vascular - 3 vascular systems (systemic, placental, vitelline) extensively remodelled
Respiratory
- left and right lung buds push into the pericardioperitoneal canals (primordia of pleural cavity)
Neural
- Central nervous system - secondary brain vesicles
- Sensory - Hearing cochlear part of otic vesicle elongates (humans 2.5 turns)
Cardiovascular
Heart Development Timeline (see Basic Cardiac Embryology)
Respiratory
Week 4 - laryngotracheal groove forms on floor foregut.
Week 5 - left and right lung buds push into the pericardioperitoneal canals (primordia of pleural cavity) Week 6 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes. Week 7 - enlargement of liver stops descent of heart and lungs. Month 3-6 - lungs appear glandular, end month 6 alveolar cells type 2 appear and begin to secrete surfactant. Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and alveolar sacs. |
Neural
Rapid growth folds the neural tube forming 3 brain flexures:
|
Movies
Cardiovascular
Heart Looping | Heart Realign | Heart Atrial Septation | Heart Outflow Septation |
See also Heart Development Timeline - Basic Cardiac Embryology
Practical 6: Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 |
Additional Information
Additional Information - Content shown under this heading is not part of the material covered in this class. It is provided for those students who would like to know about some concepts or current research in topics related to the current class page. |
Detailed Week by Week
The following information is a detailed timeline of embryonic development between week 3 to 8 and content does not form part of the current practical class.
Embryo Stages and Events
Day | Stage | Event |
Pituitary Week 5 elongation, contacts infundibulum, diverticulum of diencephalon
Heart Week 5 septation starts, atrial and ventricular Respire Week 5 left and right lung buds push into the pericardioperitoneal canals (primordia of pleural cavity) Respire Week 5 to 17 lung histology - pseudoglandular Sense - Hearing Week 5 cochlear part of otic vesicle elongates (humans 2.5 turns) | ||
Stage 14 | Ectoderm - sensory placodes, lens pit, otocyst, nasal placode, primary/secondary vesicles, fourth ventricle of brain
Mesoderm - continued segmentation of paraxial mesoderm (somite pairs), heart prominence Head - 1st, 2nd and 3rd pharyngeal arch, forebrain, site of lens placode, site of otic placode, stomodeum Body - heart, liver, umbilical cord, mesonephric ridge visible externally as bulges. Limb - upper and lower limb buds growing Neural first appearance of the future cerebral hemispheres. Cerebellar plate differentiated to an intermediate layer, and future rhombic lip identifiable PMID: 3377191 GIT - Liver hepatic gland and its vascular channels enlarge, hematopoietic function appears PMID: 9407542 | |
Stage 15 |
Neural cranial nerves (except olfactory and optic) are identifiable in more advanced embryos PMID: 3213956 | |
Sense - Eye 35 to 37 days retinal pigment present |
BGDA: Lecture 1 | Lecture 2 | Practical 3 | Practical 6 | Practical 12 | Lecture Neural | Practical 14 | Histology Support - Female | Male | Tutorial
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 24) Embryology BGDA Practical 7 - Week 5. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDA_Practical_7_-_Week_5
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G