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The arrector pili muscles, also known as hair erector muscles, are small muscles attached to hair follicles in mammals. Each hair follicle is paired with a sebaceous (oil) gland and a tiny muscle called the arrector pili. This muscle attaches to the base of the hair follicle on one end and to the upper layer of dermis on the other. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps (piloerection).
| Characteristics | Values |
|---|---|
| Name | Arrector pili muscles |
| Other names | Hair erector muscles |
| Location | Attached to hair follicles |
| Function | Contraction of the muscle causes the hair to stand on end, creating goose bumps |
| Composition | Bundle of smooth muscle fibres |
| Innervation | Sympathetic division of the autonomic nervous system |
| Contraction | Involuntary, in response to stress or nerve signals |
| Purpose | To trap a layer of air, providing insulation and conserving heat |
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What You'll Learn
- The arrector pili muscle is a small muscle attached to hair follicles in mammals
- Contraction of these muscles causes the hair to stand on end, known as goose bumps
- The arrector pili muscle is innervated by the sympathetic nervous system
- The primary function of the arrector pili muscle is to trap a layer of air to add insulation
- The arrector pili muscle is likely a vestigial function related to fur
The arrector pili muscle is a small muscle attached to hair follicles in mammals
The arrector pili muscle, also known as the hair erector muscle, is a small muscle attached to hair follicles in mammals. Each hair follicle is paired with a sebaceous (oil) gland and an arrector pili muscle. The arrector pili muscle attaches to the base of the hair follicle on one end and to the upper layer of dermis on the other. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several hair follicles (a follicular unit).
The arrector pili muscle contracts in response to nerve signals from the sympathetic nervous system, making the external hair shaft "stand up". This is known colloquially as "goosebumps" (piloerection). The contraction of the muscle is involuntary. The primary function of this muscle contraction is to trap a layer of air to add insulation, helping the animal retain heat. This is likely a vestigial function related to fur; erecting the shafts served to conserve heat in cold climates, and cut a larger silhouette to intimidate rivals or would-be predators.
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Contraction of these muscles causes the hair to stand on end, known as goose bumps
The arrector pili muscles, also known as hair erector muscles, are small muscles attached to hair follicles in mammals. Each hair follicle is paired with one of these muscles, which attaches to the base of the hair follicle on one end and to the upper layer of dermis on the other. Contraction of these muscles causes the hair to stand on end, known colloquially as goose bumps (piloerection). Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit). The contraction of the muscle is involuntary and is caused by nerve signals from the sympathetic nervous system. The primary purpose of this is to trap a layer of air to add insulation, helping the animal retain heat.
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The arrector pili muscle is innervated by the sympathetic nervous system
The arrector pili muscle is a small muscle attached to hair follicles in mammals. It is also known as the hair erector muscle. When the arrector pili muscle contracts, it causes the hair to stand on end, a phenomenon known as 'goosebumps' or 'piloerection'.
The arrector pili muscle is innervated by the sympathetic branch of the autonomic nervous system. This means that it is not under conscious control. Instead, it is stimulated by the sympathetic nervous system, which causes the muscle to contract. This contraction is involuntary and is caused by stresses such as cold temperatures or fear.
The primary function of the arrector pili muscle is to provide thermal insulation. When the muscle contracts, air becomes trapped between the erect hairs, helping the body to retain heat. This is likely a vestigial function related to fur; erecting the hair shafts served to trap air, conserve heat, and cut a larger silhouette to intimidate rivals or predators.
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The primary function of the arrector pili muscle is to trap a layer of air to add insulation
The arrector pili muscle is a small muscle attached to hair follicles in mammals. Each hair follicle is paired with one of these muscles, which attaches to the base of the hair follicle on one end and to the upper layer of dermis on the other.
The arrector pili muscle is likely a vestigial function related to fur. By erecting the hair shafts, the muscle also helps to cut a larger silhouette, which can be used to intimidate rivals or ward off predators. The contraction of the arrector pili muscle can be stimulated by various stresses, such as cold temperatures or fear.
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The arrector pili muscle is likely a vestigial function related to fur
While hair itself does not contain muscles, each hair follicle is connected to a small muscle called the arrector pili. This muscle attaches to the base of the hair follicle on one end and to the upper layer of dermis on the other. Contraction of the arrector pili muscle causes the hair to stand on end, a phenomenon known as goose bumps or piloerection. The primary function of this muscle is to trap a layer of air to provide insulation and conserve heat.
The arrector pili muscle is composed of a bundle of smooth muscle fibres which attach to several hair follicles. It is innervated by the sympathetic division of the autonomic nervous system, which provides control of the muscle. The contraction of the muscle is involuntary and can be triggered by stresses such as cold temperatures or fear.
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Frequently asked questions
Yes, each hair follicle is paired with a tiny muscle called the arrector pili.
Contraction of the arrector pili muscle causes the hair to stand on end, which is known as goose bumps or piloerection.
The primary purpose of this is to trap a layer of air to add insulation, helping the body retain heat.
