Y

UNSW Embryology Glossary Y

Link to the Original UNSW Embryology Glossary Y

Y chromosome

The male sex chromosome which contains the sry gene producing Testis-Determining Factor required for male phenotype and can only be inherited from father. In humans the chromosome contains 200+ genes and consists of 50 million base pairs. Testis-Determining Factor (TDF; Testis-Determining Factor on Y, TDY ) is a protein transcription factor and a member of the high mobility group (HMG)-box family of DNA binding proteins. See also the transcription factor SRY-related protein, SOX9 (SRY-related high-mobility group (HMG) box 9).

(More?Y Chromosome | Molecular Notes | Week 1 Notes | OMIM)

Y ligament

(iliofemoral ligament) ligament that extends from the anterior inferior iliac spine to the intertrochanteric line of the femur.

yolk

The name given to the fluid contents of the yolk sac in reptiles and birds, it has the function of providing nutrition for embryonic growth.

(More? Week 2 Notes)

yolk sac

An [E.htm#extraembryonic_membrane extraembryonic membrane]which is endoderm origin and covered with extraembryonic mesoderm. Yolk sac lies outside the embryo connected initially by a yolk stalk to the midgut with which it is continuous with. The endodermal lining is continuous with the endoderm of the gastrointestinal tract. In reptiles and birds, the yolk sac has a function associated with nutrition. In mammals the yolk sac acts as a source of primordial germ cells and blood cells.

(More? Week 2 Notes | Gastrointestinal Tract Notes | Cardiovascular System - Blood)

yolk stalk

Tube-like extension of the yolk sac which lies outside the embryo with the midgut inside the embryo. The endodermal lining is continuous with the endoderm of the gastrointestinal tract.

(More? Week 2 Notes | Gastrointestinal Tract Notes | Cardiovascular System - Blood) Created: 01.06.1997Updated: 04.09.2008 UNSW CRICOS Provider Code No. 00098G