2009 Lecture 18: Difference between revisions
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== Hair == | == Hair == | ||
* Before birth we have embryonic hair that has an imporant role in binding the skins waxy protective coating against our watery environment. | * Before birth we have embryonic hair that has an imporant role in binding the skins waxy protective coating against our watery environment. | ||
* After birth we have early postnatal hair that is gradually replaced by the mature form. | * After birth we have early postnatal hair that is gradually replaced by the mature form. | ||
* At puberty we have a second round of hair formation under endocrine regulation by sex hormones. | * At puberty we have a second round of hair formation under endocrine regulation by sex hormones. | ||
===Fetal Hair=== | |||
* Month 5 - hair appears on the head and beginning of vernix caseosa deposition. | |||
* Month 6 - body is covered by fine hairs (lanugo) and the deposit of vernix caseosa is considerable. Skin papilla are developed and the free border of the nail projects from the corium of the dermis. | |||
* Month 8 - skin now completely coated with vernix caseosa, and the lanugo begins to disappear. Skin is also pink in colour and subcutaneous fat being deposited (hypodermis layer). | |||
* Month 9 - lanugo has largely disappeared from the trunk. | |||
== Images == | == Images == | ||
Revision as of 12:13, 28 September 2009
Integumentary System
The specializations upon our skin surface have many different roles and functions. In development, it is initially the distribution or "pattern" that is of interest.
Hair
- Before birth we have embryonic hair that has an imporant role in binding the skins waxy protective coating against our watery environment.
- After birth we have early postnatal hair that is gradually replaced by the mature form.
- At puberty we have a second round of hair formation under endocrine regulation by sex hormones.
Fetal Hair
- Month 5 - hair appears on the head and beginning of vernix caseosa deposition.
- Month 6 - body is covered by fine hairs (lanugo) and the deposit of vernix caseosa is considerable. Skin papilla are developed and the free border of the nail projects from the corium of the dermis.
- Month 8 - skin now completely coated with vernix caseosa, and the lanugo begins to disappear. Skin is also pink in colour and subcutaneous fat being deposited (hypodermis layer).
- Month 9 - lanugo has largely disappeared from the trunk.
Images
Hair histology
Dermatomes
Neonate hair
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
Course Content 2009
Embryology Introduction | Cell Division/Fertilization | Cell Division/Fertilization | Week 1&2 Development | Week 3 Development | Lab 2 | Mesoderm Development | Ectoderm, Early Neural, Neural Crest | Lab 3 | Early Vascular Development | Placenta | Lab 4 | Endoderm, Early Gastrointestinal | Respiratory Development | Lab 5 | Head Development | Neural Crest Development | Lab 6 | Musculoskeletal Development | Limb Development | Lab 7 | Kidney | Genital | Lab 8 | Sensory - Ear | Integumentary | Lab 9 | Sensory - Eye | Endocrine | Lab 10 | Late Vascular Development | Fetal | Lab 11 | Birth, Postnatal | Revision | Lab 12 | Lecture Audio | Course Timetable
Cite this page: Hill, M.A. (2026, October 28) Embryology 2009 Lecture 18. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2009_Lecture_18
- © Dr Mark Hill 2026, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
