Numbers

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2D:4D

The ratio of 2nd and 4th finger (digit) length. This ratio has been suggested to relate to high fetal testosterone concentration (males have lower 2D:4D than females) and also thought to be an indicator of various neurological abnormalities.

(More? Neural System - Abnormalities | Endocrine System Development | The use of digit ratios as markers for perinatal androgen action. Reprod Biol Endocrinol. 2006 Feb 26;4:10. PMID: 16504142.)

3rd ventricle

(third ventricle) A fluid-filled space formed from neural tube lumen, located within the diencephalon (from the primary vesicle, prosencephalon or forebrain). In the adult this region lies between the two thalamic bodies. The massa intermedia passes through it and the hypothalamus forms its floor and part of its lateral walls.

(More? Lecture - Ectoderm Development | Ventricular System | Neural System Development)

4th ventricle

(fourth ventricle) A fluid-filled space formed from neural tube lumen, located within the rhombencephalon (from the primary vesicle, hindbrain). This ventricle is connected to the subarachnoid space via two lateral foramina of Luschka and by one medial foramen of Magendie.

(More? Lecture - Ectoderm Development | Ventricular System | Neural System Development)

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. (2024, May 6) Embryology Numbers. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Numbers

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