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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 | Original UNSW Embryology Glossary J

Jacobson's organ

(vomeronasal organ, VNO) A neural structure forming part of olfactory system that functions in the detection of pheromones. Named after Ludwig Lewin Jacobson (1783 – 1843) a Danish surgeon who identified it in 1813.


ligand for the Notch cell surface receptor. Has an important role in blood vessel development. Signal activation leads to cleavage of the intracellular part of the Notch receptor from the membrane which translocates to the nucleus and activate s transcription factors.
(More? Blood Vessel Development | OMIM - Jagged1 | Pubmed - Jagged1 is required for vascular smooth muscle development)


acronym for "just another kinase" a kinase family involved in signal transduction.
(More? Molecular Development)


Yellow colouration of the skin caused by high levels of bilirubin in the body. Present to some extent in most newborns due mainly to the time taken for the newborn liver to develop and functionally process bilirubin. Jaundice can also occur with normally with breast feeding (breastfeeding jaundice) and abnormally as a sign of a range of newborn abnormalities (conditions increasing red blood cell number or interference with bilirubin processing/removal).
(More? Medline Plus - Newborn jaundice)


acronym for "Joints Abnormal With Splitting" a protein in mouse musculoskeletal development which coordinates cartilage formation and synovial joint positioning.
(More? Joint Development | Molecular Development)


(Latin, jejunus = empty of food) Second part of the small intestine extending from the duodenum to the ileum.
(More? Gastrointestinal Tract Development)

Joints Abnormal With Splitting

(JAWS) A protein identified in mouse musculoskeletal development, which coordinates cartilage formation and synovial joint positioning identified in digit formation.
(More? Mouse Development | Joint Development | Molecular Development)

Joubert syndrome

( JSRD) A rare autosomal recessive brain malformations. Magnetic resonance imaging has been recently used to detect posterior fossa signs and narrowing at the pontomesencephalic junction (isthmus) in diagnosing at-risk pregnancies.
(More? Neural System Development | [PMID: 19942698])

Glossary Comments

Use this page to access brief definitions of specific embryology terms. Additional information can be accessed from links listed at the end of each definition. Glossary from the UNSW Embryology program compiled and written by Dr Mark Hill. Reference material used in preparing this glossary list includes: texts listed on page 1 "Reading" of each notes section, Department of Anatomy Publications, WWW resources from NCBI, NIH, OMIM, NHMRC (Australia), AMA (USA), Office of Rare Diseases (USA), PubMed Medline Dictionaries, MSDS, Merck Manual home edn. and WHO ART terminology (2009).

These notes are for Educational Purposes Only Please email Dr Mark Hill if you wish to make a comment about this current project.

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. (2020, December 4) Embryology J. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/J

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© Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G