BGDB Face and Ear - Early Embryo: Difference between revisions
Line 200: | Line 200: | ||
==Additional Information== | ==Additional Information== | ||
===Other Sensory Systems=== | |||
The links below are to '''additional information''' providing background about each of the sensory systems. Only hearing is covered in today's class. | |||
{{Template:Hearing Links}} | |||
{{Template:Vision Links}} | |||
{{Template:Smell Links}} | |||
:'''Taste Links:''' [[Sensory - Taste Development|Introduction]] | |||
===Neural Crest=== | |||
During this period neural crest cells migrate into the pharyngeal arches and other head locations, and have an important contribution to many head structures. | |||
{| | {| | ||
| [[File:Cranial neural crest skeletal fate 01.jpg|600px]] | | [[File:Cranial neural crest skeletal fate 01.jpg|600px]] |
Revision as of 11:54, 14 May 2012
Practical 6: Trilaminar Embryo | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities |
Week 4
During week 4 a number of features appear visible on the embryo surface:
- At the level of the body heart, liver, somite bulges and limb buds appear.
- At the level of the head sensory placodes and pharyngeal arches appear.
Carnegie Stage 12 to 14
Week 4
This is a scanning EM of the embryo superior dorsal view showing the paired otic placodes sinking into the surface at the level of the hindbrain between day 24 and day 25
Week 5
Sensory Placodes
Stage 13
Identify the structure and position of the otic vesicle (otocyst) relative to other head structures.
Stage 13 Movie - Overview of Head, Pharyngeal Arches and Pharynx
Pharyngeal Arches
Stage 13 Pharyngeal Arches
Section Images: A6L A7L B1L B2L B3L B4L B5L B6L
Look through the above cross-sections of the stage 13 embryo observing and identifying structures of the face and ear visible at this stage.
Structures derived from Arches
Arch |
Nerve |
Muscles |
Skeletal |
Artery |
(maxillary/mandibular) |
|
mastication |
Meckel's cartilage |
maxillary(terminal branches) |
(hyoid) |
|
facial expression |
Reichert's cartilage |
stapedial (embryonic) |
|
|
stylopharyngeus |
greater cornu of hyoid, lower part of body of hyoid bone |
common carotid, internal carotid (root) |
|
|
intrinsic muscles of larynx, pharynx; levator palati |
thyroid, cricoid, arytenoid, corniculate and cuneform cartilages |
4 - aortic arch, right subclavian |
Structures derived from Pouches
Pouch |
Overall Structure |
Specific Structures |
|
tubotympanic recess |
tympanic membrane, tympanic cavity, mastoid antrum, auditory tube |
|
intratonsillar cleft |
crypts of palatine tonsil, lymphatic nodules of palatine tonsil |
|
inferior parathyroid gland, thymus gland |
|
|
superior parathyroid gland, ultimobranchial body |
|
|
becomes part of 4th pouch |
Additional Information
Other Sensory Systems
The links below are to additional information providing background about each of the sensory systems. Only hearing is covered in today's class.
Vision Links: vision | lens | retina | placode | extraocular muscle | cornea | eyelid | lacrima gland | vision abnormalities | Student project 1 | Student project 2 | Category:Vision | sensory | ||
|
Smell Links: Introduction | placode | Rhinencephalon | head | respiratory | Student project | taste | sensory | Category:Smell | ||
|
- Taste Links: Introduction
Neural Crest
During this period neural crest cells migrate into the pharyngeal arches and other head locations, and have an important contribution to many head structures.
Cranial neural crest contribution to skeletal structures
|
|
|
Reference: <pubmed>14523380</pubmed>| Nat Rev Neurosci.
Practical 6: Trilaminar Embryo | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities |
BGDB: Lecture - Gastrointestinal System | Practical - Gastrointestinal System | Lecture - Face and Ear | Practical - Face and Ear | Lecture - Endocrine | Lecture - Sexual Differentiation | Practical - Sexual Differentiation | 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 BGDB Face and Ear - Early Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDB_Face_and_Ear_-_Early_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G