Thyroglossal duct
From Wikipedia, the free encyclopedia
| Thyroglossal duct | ||
|---|---|---|
 |
||
| Duct not labeled, but arises nearest to region identified as 'pyramidal lobe') | ||
 |
||
| Pattern of the branchial arches. I-IV branchial arches, 1-4 branchial pouches (inside) and/or pharyngeal grooves (outside) a Tuberculum laterale b Tuberculum impar c Foramen cecum d Ductus thyreoglossus e Sinus cervicalis |
||
| Latin | ductus thyroglossalis | |
| Carnegie stage | 14 | |
| Dorlands/Elsevier | d_29/12315154 | |
The thyroglossal duct is an embryological anatomical structure which forms the connection between the initial area of development of the thyroid gland and its final position.
The thyroid gland starts developing in the pharynx in the fetus and descends to its final position taking a path through the tongue, hyoid bone and neck muscles. The connection between its original position and its final position is the thyroglossal duct. This duct normally atrophies and closes off before birth but can remain open in some people.
Failure of the thyroglossal duct to atrophy leads to a persistent thyroglossal duct.
[edit] External links
 |
This developmental biology article is a stub. You can help Wikipedia by expanding it. |
| Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages) |
|---|
| Week 1: Zygote - Morula - Blastula/Blastomere/Blastosphere - Archenteron/Primitive streak - Blastopore - Allantois - Trophoblast (Cytotrophoblast - Syncytiotrophoblast - Gestational sac)
Week 2: Yolk sac - Vitelline duct - Bilaminar disc Week 3: Hensen's node - Gastrula/Gastrulation - Trilaminar embryo Branchial arch (1st) - Branchial pouch - Meckel's cartilage - Somite/Somitomere - Sclerotome - Myotome - Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm, Splanchnopleure, Somatopleure) Histogenesis and Organogenesis Glands: Thyroglossal duct Uterine support: Placenta - Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Amniotic sac (Amnion, Chorion) |
