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==Development==
==Development==
[[image: Section of Foetal Cat Skin.jpg|thumb|200px|right|A section of foetal cat skin showing developing hair follicles. ©RVC2008]]
[[image: Section of Foetal Cat Skin.jpg|thumb|200px|right|A section of foetal cat skin showing developing hair follicles. ©RVC2008]]
Hair follicles are divided into three parts:
Hair follicles are divided into three parts:
:The ''infundibulum'' corresponds to the area from the opening of the sebaceous duct to the surface of the skin.
The ''infundibulum'' corresponds to the area from the opening of the sebaceous duct to the surface of the skin.
:The ''isthmus'' is the area between the opening of the sebaceous duct and the attachment of the arrector pili muscle.
:The ''inferior segment'' extends from the attachment of the arrector pili muscle to the dermal hair papilla.
The ''isthmus'' is the area between the opening of the sebaceous duct and the attachment of the arrector pili muscle.
The ''inferior segment'' extends from the attachment of the arrector pili muscle to the dermal hair papilla.
Tactile hairs are associated with a sensory function and are much '''thicker and stiffer''' than other hairs. They are mainly found on the face and can also be referred to as '''''whiskers''''' or '''''vibrissae'''''. Their '''follicles are much deeper''' into the hypodermis than guard or wool hairs and possess a '''venous sinus and nerve endings with mechanoreceptors'''. During embryonic development, they appear before other hair types.
Tactile hairs are associated with a sensory function and are much '''thicker and stiffer''' than other hairs. They are mainly found on the face and can also be referred to as '''''whiskers''''' or '''''vibrissae'''''. Their '''follicles are much deeper''' into the hypodermis than guard or wool hairs and possess a '''venous sinus and nerve endings with mechanoreceptors'''. During embryonic development, they appear before other hair types.
These hairs are mostly found on the '''face, near the eyes and on the upper lip'''. However they are also found in other areas, for example in a cluster on the '''carpus in cats''', in a tuft on a '''dogs' cheeks'''.
These hairs are mostly found on the '''face, near the eyes and on the upper lip'''. However they are also found in other areas, for example in a cluster on the '''carpus in cats''', in a tuft on a '''dogs' cheeks'''.
*'''Tylotrich hairs'''
These large hair follicles are '''rapidly adapting mechanoreceptors'''. They may be present anywhere on the body. These structures consist of a single large hair, surrounded by neurovascular tissue at the level of the sebaceous gland.
{{Learning
|flashcards = [[Hair flashcards - Anatomy & Physiology|Hair Flashcards]]<br>[[Ear flashcards - Anatomy & Physiology|Ear Flashcards]]<br>[[Small Animal Dermatology Q&A 07]]<br>[[Small Animal Dermatology Q&A 03]]
|dragster = [[Integumentary System Histology Resource (III)|Hair Follicle Histology Dragster I]]<br>[[Integumentary System Histology Resource (IV)|Hair Follicle Histology Dragster II]]<br>[[Integumentary System Histology Resource (V)|Sinus Hair Histology Dragster I]]<br>[[Integumentary System Histology Resource (VI)|Sinus Hair Histology Dragster II]]
}}
==References==
==References==
Bowden, S. (2003) '''Veterinary anatomy and physiology: a workbook for students''' ''Elsevier Health Sciences''
Bowden, S. (2003) '''Veterinary anatomy and physiology: a workbook for students''' ''Elsevier Health Sciences''
Moriello, K (2005) '''Self-Assessment Colour Review - Small Animal Dermatology''' ''Manson''
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[[Category:Integumentary System - Anatomy & Physiology]][[Category:Image Review]]
[[Category:Integumentary System - Anatomy & Physiology]][[Category:Image Review]]