Alec Titan
The tail is an elongated section at the rear end of a bilaterian animal's body, extending backwards from the torso. Tails are primarily considered a feature of vertebrates, but some invertebrates such as scorpions and snails also have tail-like appendages. The muscles of the tail are a continuation of the muscles of the back and pelvis, arranged in a circular manner around the coccygeal vertebrae. These tail muscles serve several functions and can be classified into three groups: elevators, depressors, and lateral flexors. They are surrounded by the caudal fascia and play a crucial role in providing balance, counterbalance, and agility for terrestrial vertebrates like cats and kangaroos. Additionally, tails are used for communication and signalling, with canines using their tails to convey mood and intention.
| Characteristics | Values |
|---|---|
| Muscles of the tail | Continuation of the muscles of the back and pelvis |
| Arrangement of muscles | Circular arrangement around the coccygeal vertebrae |
| Muscle groups | Elevators, depressors, and lateral flexors |
| Muscles around the tail | Surrounded by the caudal fascia |
| Muscles in canines | 6-23 highly mobile vertebrae |
| Muscle movement | Capable of lifting the tail, moving it from side to side, or drawing it down toward the anus or between the hind legs |
| Muscle location | Lumbar vertebrae, sacrum, and tail vertebrae |
| Muscle attachment | Attached to the tail vertebrae by tendons |
| Nerve involvement | Four to seven paired nerves |
| Functions | Provide thrust for aquatic locomotion, balance, grasping, utility, insulation, aggression, and communication |
| Muscle control | Retraction of the penis into a pouch in cetaceans is caused by contraction of the retractor penis muscles |
| Autotomy | Suturing an autotomized tail may delay healing and regrowth |
| Genes | CEBPD, HBP1, HDAC9, HES1, MYOD1, TRMM55, and ZFP36 |
| Cat tail muscles | M. sacrocaudalis dorsalis medialis (SDM), M. sacrocaudalis dorsalis lateralis (SDL), M. coccygeus lateralis (CL), M. coccygeus medialis (CM), M. sacrocaudalis ventralis lateralis (SVL), and M. sacrocaudalis ventralis medialis (SVM) |
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What You'll Learn
- Muscles of the tail are a continuation of the back and pelvis muscles
- Tail muscles are arranged in a circular manner around the coccygeal vertebrae
- Tail muscles can be classified into three groups: elevators, depressors, and lateral flexors
- Muscles that insert on the tail vertebrae exclusively
- Tail muscles are important for stabilising the vertebral column and balance
Muscles of the tail are a continuation of the back and pelvis muscles
The muscles of the tail are indeed a continuation of the back and pelvis muscles. They are arranged in a circular fashion around the coccygeal vertebrae, which is the homologous vestigial of the tail in animals that have evolved to lose them, such as frogs and hominid primates. The tail muscles serve several functions and can be classified into three groups: elevators, depressors, and lateral flexors. All the muscles of the tail are surrounded by the caudal fascia.
The tail is an elongated section at the rear end of a bilaterian animal's body, extending backward from the midline of the torso. In terrestrial vertebrates like cats and kangaroos, the tail is used for balance. Some animals, such as monkeys and opossums, have prehensile tails adapted for arboreal locomotion. The tail can also be used to drive away parasitic flies and sweep off other biting insects, as seen in grazing animals like horses and oxen. Furthermore, some species with broad, furry tails, such as foxes, wrap their tails around their bodies for thermal insulation.
The tail also serves aggressive functions in some species, such as scorpions, which have a stinger in their tails containing venom, and stingrays, which have a thickened spine that can inflict penetrating trauma. The tail can also be used as a weapon, as seen in extinct armored dinosaurs like stegosaurs and ankylosaurs, which had tails with spikes or clubs for defence against predators. Additionally, the tail plays a vital role in communication and signalling in various species, including canines, deer, beavers, felids, and rattlesnakes.
In terms of anatomy, the canine tail consists of between six and 23 highly mobile vertebrae. These vertebrae are enclosed by a versatile musculature that allows for various movements, including lifting the tail, moving it from side to side, or drawing it down towards the anus or between the hind legs. The caudal muscles lie on the lumbar vertebrae, sacrum, and tail vertebrae, with the muscles attaching to the tail vertebrae by tendons. The tail muscles are also important in stabilising the vertebral column and supporting the extensor muscles of the back, croup, and buttocks.
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Tail muscles are arranged in a circular manner around the coccygeal vertebrae
The tail is the elongated section at the rear end of a bilaterian animal's body. It is a distinct, flexible appendage extending backward from the torso's midline. While tails are primarily considered a feature of vertebrates, some invertebrates like scorpions, springtails, snails, and slugs also have tail-like structures.
In animals with tails, the tail muscles are a continuation of the muscles of the back and pelvis. These tail muscles are arranged in a circular fashion around the coccygeal vertebrae. This arrangement allows for a wide range of movements and functions. The tail muscles can be classified into three groups: the elevators, the depressors, and the lateral flexors. All these muscles are surrounded by the caudal fascia.
The tail muscles play a crucial role in several aspects of an animal's life. One of their primary functions is to provide balance and stability. For example, terrestrial vertebrates like cats and kangaroos use their tails for balance when moving. Additionally, the tail muscles help stabilize the vertebral column and support the extensor muscles of the back and the croup and buttocks.
The tail also serves as a means of communication and signalling for many animals. Canines, for instance, use their tails to communicate their mood and intention. The position and movement of their tails indicate emotions, with dominant dogs carrying their tails high, while frightened dogs tuck their tails between their legs to avoid attention.
Furthermore, some animals have adapted their tail muscles for specific purposes. Monkeys and opossums have prehensile tails that aid in arboreal locomotion, allowing them to grasp and swing from branches. Other animals, like foxes, use their broad, furry tails for thermal insulation, wrapping them around their bodies for warmth.
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Tail muscles can be classified into three groups: elevators, depressors, and lateral flexors
Tail muscles are a continuation of the muscles of the back and pelvis and are arranged in a circular fashion around the coccygeal vertebrae. They can be classified into three groups: elevators, depressors, and lateral flexors.
The elevators are responsible for lifting the tail, while the depressors draw it down towards the anus or between the hind legs. The lateral flexors allow the tail to move from side to side. These muscles are surrounded by the caudal fascia and are served by four to seven paired nerves.
In canines, the tail is used for communication and signalling. The movement of the tail acts as a fan, spreading the animal's natural scent. The position of the tail also indicates the mood of the dog, with a dominant dog carrying its tail high, and a frightened dog holding its tail between its legs.
Tails are also used for balance and agility, especially during quick turns or complicated movements. They provide a source of thrust for aquatic locomotion in some species, and in others, they serve aggressive functions, such as the stinger in a scorpion's tail. Some animals, like geckos, can even self-amputate their tails to escape predators.
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Muscles that insert on the tail vertebrae exclusively
The muscles of the tail are a continuation of the muscles of the back and pelvis. They are arranged in a circular fashion around the coccygeal vertebrae. These muscles are surrounded by the caudal fascia and can be classified into three groups: the elevators, the depressors, and the lateral flexors.
The tail vertebrae are enclosed by a versatile musculature that makes the various segments, especially the tip, capable of finely graded movements. The muscles insert on the tail/caudal vertebrae exclusively, with the most posterior tendons attaching to the last tail vertebra. The caudal muscles lie on the lumbar vertebrae, sacrum (in the lower back region), and tail vertebrae. The muscles are attached to the tail vertebrae by tendons.
In dogs, the tail is located at the end of the vertebral column and is the most posterior or caudal terminal appendage. Four to seven paired nerves serve the tail muscles, which have many tendons that insert from the fifth or sixth caudal vertebra and then onto the next vertebra and so on to the end of the tail. Part of the musculature is formed from muscles associated with the rectum, the anus, and the pelvic diaphragm.
In cats, the tail muscles mainly consist of six muscles on both sides: M. sacrocaudalis dorsalis medialis (SDM), M. sacrocaudalis dorsalis lateralis (SDL), M. coccygeus lateralis (CL), M. coccygeus medialis (CM), M. sacrocaudalis ventralis lateralis (SVL), and M. sacrocaudalis ventralis medialis (SVM).
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Tail muscles are important for stabilising the vertebral column and balance
The tail is the elongated section at the rear end of a bilaterian animal's body. It is a distinct, flexible appendage extending backward from the torso's midline. While tails are primarily considered a feature of vertebrates, some invertebrates like scorpions, springtails, snails, and slugs also have tail-like structures.
In terrestrial vertebrates like cats and kangaroos, the tail is essential for maintaining balance. These tails are controlled by strong caudal muscles that lie on the lumbar vertebrae, sacrum, and tail vertebrae. The muscles insert exclusively onto the tail vertebrae via tendons, with the most posterior tendons attaching to the last tail vertebra. This muscular system provides stability to the vertebral column and supports the extensor muscles of the back, croup, and buttocks.
The tail muscles can be classified into three groups: elevators, depressors, and lateral flexors. These muscles enable various tail movements, including lifting the tail, moving it from side to side, or drawing it down toward the anus or between the hind legs. In dogs, for example, the tail helps provide counterbalance during complex movements such as leaping or climbing.
Additionally, the tail muscles play a role in communication. For instance, canines use their tails to convey mood and intention. The position and movement of a dog's tail, along with the release of scent from the anal glands, can indicate dominance, fear, or other emotions.
In summary, tail muscles are crucial for stabilising the vertebral column and balance in many animal species. They provide the flexibility and strength required for various movements and play a significant role in communication and survival.
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Frequently asked questions
Tail muscles are a continuation of the muscles of the back and pelvis. They are arranged in a circular manner around the coccygeal vertebrae and are surrounded by the caudal fascia. They help with balance, counterbalance, and stabilization of the vertebral column.
Examples of tail muscles in cats include M. sacrocaudalis dorsalis medialis (SDM), M. sacrocaudalis dorsalis lateralis (SDL), M. coccygeus lateralis (CL), M. coccygeus medialis (CM), M. sacrocaudalis ventralis lateralis (SVL), and M. sacrocaudalis ventralis medialis (SVM).
Tails have a variety of uses. They can be used for balance, counterbalance, communication, insulation, and even as a weapon. Some animals use their tails for swimming, such as fish, cetaceans, and crocodilians, while others use them for grasping, such as monkeys and opossums.
