Difference between revisions of "Small Animal Dermatology Q&A 07"
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#During telogen, or the resting stage, the hair stops growing and is retained in the hair follicle as a dead hair. A telogen hair is characterized as a small hair, approximately one-third the length of the anagen hair. Hairs continue to grow until they reach a preset length and then enter the resting phase. The hair will remain in this state until a new hair starts to grow, pushes the old hair out, and the old hair is shed. <br><br> | #During telogen, or the resting stage, the hair stops growing and is retained in the hair follicle as a dead hair. A telogen hair is characterized as a small hair, approximately one-third the length of the anagen hair. Hairs continue to grow until they reach a preset length and then enter the resting phase. The hair will remain in this state until a new hair starts to grow, pushes the old hair out, and the old hair is shed. <br><br> | ||
Hairs in dogs and cats are replaced in a mosaic pattern with peaks of hair loss/replacement in the spring and fall. The other two most common replacement patterns are seasonal and waves. | Hairs in dogs and cats are replaced in a mosaic pattern with peaks of hair loss/replacement in the spring and fall. The other two most common replacement patterns are seasonal and waves. | ||
| − | |l1= | + | |l1=Hair - Anatomy & Physiology |
|q2=What factors influence hair growth in animals? | |q2=What factors influence hair growth in animals? | ||
|a2= | |a2= | ||
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*local factors that directly influence the growth of hair follicles. <br> | *local factors that directly influence the growth of hair follicles. <br> | ||
The most important of these factors are photoperiod and ambient temperature. | The most important of these factors are photoperiod and ambient temperature. | ||
| − | |l2= | + | |l2=Hair - Anatomy & Physiology#Control of hair growth |
|q3=Describe the basic anatomy of a hair follicle. | |q3=Describe the basic anatomy of a hair follicle. | ||
|a3= | |a3= | ||
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#The isthmus consists of the area between the opening of the sebaceous duct and the attachment of the arrector pili muscle. | #The isthmus consists of 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 inferior segment extends from the attachment of the arrector pili muscle to the dermal hair papilla. | ||
| − | |l3= | + | |l3=Hair - Anatomy & Physiology#Hair and hair follicle anatomy |
</FlashCard> | </FlashCard> | ||
Latest revision as of 22:42, 31 August 2011
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This question was provided by Manson Publishing as part of the OVAL Project. See more small animal dermatological questions |
A photomicrograph of a cross section of a hair bulb is shown.
| Question | Answer | Article | |
| What are the stages of the hair cycle, and what are the most common patterns of growth in dogs and cats? | There are three stages or cycles in hair growth.
Hairs in dogs and cats are replaced in a mosaic pattern with peaks of hair loss/replacement in the spring and fall. The other two most common replacement patterns are seasonal and waves. |
Link to Article | |
| What factors influence hair growth in animals? | The hair cycle of animals is controlled by a number of factors including:
The most important of these factors are photoperiod and ambient temperature. |
Link to Article | |
| Describe the basic anatomy of a hair follicle. | Hair follicles are divided into three major anatomical regions: the infundibulum, isthmus, and the inferior segment.
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Link to Article | |
