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The rotator muscles are a set of short muscles located laterally along the vertebral column, attaching between the transverse and spinous processes of thoracic vertebrae. They are the deepest muscles in the transversospinalis group, the deep layer of intrinsic back muscles. Rotatores muscles are identified as thoracic rotators and back extensors, but their primary function is as stabilizers of the spinal column. Ipsilaterally, the rotator muscles may contribute to posterior glide, compression, and contralateral rotation. For example, the splenius cervicis enables the ipsilateral lateral flexion and rotation of the neck by unilateral contraction.
| Characteristics | Values |
|---|---|
| Type | Rotatores muscles are a set of short muscles located laterally along the vertebral column |
| Location | Between the transverse and spinous processes of thoracic vertebrae |
| Function | Stabilizers, extensors and rotators of the spine |
| Innervation | Medial branches of dorsal rami of associated spinal nerves |
| Blood Supply | Dorsal branches of posterior intercostal and lumbar arteries |
| Anatomy | Can be divided regionally into rotatores colli/cervicis, rotatores thoracis, and rotatores lumborum |
| Role | Proprioceptors and mechanical stabilizers of the spine |
| Ipsilateral Rotation | Involves the internal oblique, transversus abdominis, and latissimus dorsi muscles |
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What You'll Learn
- Rotatores muscles are the deepest muscles in the transversospinalis group
- They are divided into rotatores colli/cervicis, thoracis and lumborum
- Rotatores thoracis are the most developed and are located in the thoracic spine
- They are important stabilisers of the vertebral column
- They are highly rich in muscle spindles, which are stimulated by stretch
Rotatores muscles are the deepest muscles in the transversospinalis group
The rotatores muscles are the deepest muscles in the transversospinalis group, which is a deep group of intrinsic back muscles. They are also the shortest transversospinal muscles. The rotatores muscles lie between the transverse and spinous processes of the vertebral column and are grouped by the length of their fascicles and the region covered. The rotatores muscles are divided into rotatores colli/cervicis, rotatores thoracis, and rotatores lumborum. The first two are often inconsistent and can be replaced by deep fibres of the multifidus. The rotatores thoracis are the most developed and are usually the region described in anatomy classes and textbooks. They are located in the thoracic spine and can be further subdivided into long rotatores and short rotatores, based on the length of their muscle fibres. There are usually eleven pairs of rotatores thoracis muscles, but some may be absent at either end of the thoracic spine.
The rotatores muscles are part of the deep, core muscle groups of the body and assist in powering all limb movement, acting as dynamic stabilisers. They are highly rich in muscle spindles, which are stimulated by stretch. They are likely to be affected during active and passive end-range rotational movements, such as a baseball swing or a golf swing. The rotatores muscles are also important stabilizers of the vertebral column, acting as extensible ligaments that adjust their length to support adjacent vertebrae. Bilateral contraction of these muscles extends the vertebral column, while unilateral contraction causes rotation of the trunk to the contralateral side.
The rotatores muscles are supplied by the medial branches of the dorsal rami of associated spinal nerves. They receive arterial blood from the dorsal branches of the posterior intercostal and lumbar arteries, which arise from the supreme intercostal artery and the thoracic aorta.
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They are divided into rotatores colli/cervicis, thoracis and lumborum
The rotatores muscles are a set of short muscles that rotate, extend and stabilize the spine. They are the deepest and shortest transversospinal muscles and are located between the transverse and spinous processes. They are part of the deep layer of intrinsic back muscles.
The rotatores muscles can be divided regionally into rotatores colli/cervicis, rotatores thoracis, and rotatores lumborum. The rotatores colli and lumborum are often inconsistent and can be replaced by deep fibres of the multifidus. The rotatores thoracis are the most developed and are usually the focus of anatomical descriptions. They are located in the thoracic spine and can be further subdivided into long rotatores and short rotatores, based on the length of their muscle fibres.
The rotatores thoracis are small, quadrilateral muscles located between the thoracic vertebrae. There are eleven pairs of muscles, usually with the first or last pair sometimes absent. The long rotators (rotatores longi) originate from the transverse processes of the thoracic vertebrae and insert into the bases of the spinous processes and laminae of thoracic vertebrae located two levels above. The short rotators (rotatores breves) have identical attachments as the long rotators but extend only one level above their origin, making them shorter.
The rotatores muscles receive innervation from the medial branches of the dorsal (or posterior) rami of the spinal nerves corresponding to their level. The cervical, thoracic, and lumbar regions of the muscle are innervated by the cervical, thoracic, and lumbar spinal nerves, respectively. The posterior branches of the posterior intercostal and lumbar arteries supply these muscles.
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Rotatores thoracis are the most developed and are located in the thoracic spine
The rotatores thoracis are the most developed rotatores muscles, and they are located in the thoracic spine. They are a set of short muscles that lie between the transverse and spinous processes of the thoracic vertebrae. They are deep muscles in the transversospinalis group, which also includes the semispinalis and multifidus. The rotatores thoracis are the most important subtype acting on the spine, as the rotatores colli and lumborum are often inconsistent and may be replaced by deep fibres of the multifidus.
The rotatores thoracis can be further subdivided into long rotatores and short rotatores, based on the length of their muscle fibres. There are usually eleven pairs of small quadrilateral muscles, with the first pair between T1 and T2, and the last pair between T11 and T12. However, the first or last pair can sometimes be absent. The long rotatores originate from the transverse processes of the thoracic vertebrae and insert into the bases of the spinous processes and laminae of thoracic vertebrae located two levels above. The short rotatores attach to the vertebrae one level above their origin.
The rotatores muscles are identified as thoracic rotators and back extensors in many texts, but this action is not often disputed. Instead, the rotatores are more likely stabilisers of the spinal column, acting as extensible ligaments that adjust their length to support adjacent vertebrae. Bilateral contraction results in extension of the vertebral column, while unilateral contraction causes contralateral rotation of the thoracic spine. The rotatores muscles occupy positions of poor mechanical leverage, and studies have shown a minimal contribution towards spine movements.
The rotatores muscles are highly rich in muscle spindles, which are stimulated by stretch. They are likely affected during active and passive end-range rotational movements, such as a baseball swing or a golf swing. Impaired proprioception resulting from injury may increase the risk of reinjury, so restoring proprioception of the lumbar spine after injury should be a goal of treatment. Core stabilisation programs are suggested to decrease low back pain, as weakness in the rotatores muscle is associated with low back pain.
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They are important stabilisers of the vertebral column
Rotatores muscles are a set of short muscles located laterally along the vertebral column. They are the deepest and shortest transversospinal muscles, lying between the transverse and spinous processes of the thoracic vertebrae. They can be further subdivided into long rotatores and short rotatores, based on the length of their muscle fibres.
Rotatores are important stabilisers of the vertebral column, acting as extensible ligaments that adjust their length to support adjacent vertebrae. They occupy positions of poor mechanical leverage, and studies have shown a minimal contribution of the rotatores towards spine movements. Instead, they play a role in fine-tuning vertebral motion, such as the normal top-down anterior glide of each vertebra during spinal flexion.
The rotatores also have a proprioceptive role, as they are highly rich in muscle spindles, sensing the positioning of each spinal motion. This role is particularly important in active and passive end-range rotational movements, such as a baseball swing or a golf swing. Impaired proprioception resulting from injury may degrade lumbar motor function, increasing the risk of reinjury. Therefore, restoring proprioception of the lumbar spine after injury is crucial for optimal recovery.
In Lumbo Pelvic Hip Complex Dysfunction (LPHCD), the lumbar segments are often short or overactive, along with the extensors of the lumbar spine. To address this, manual release of overactive fascicles and joint mobilisation for restricted motions should be combined with exercises that challenge the Intrinsic Stabilization Subsystem to stabilise the lumbar spine and resist rotation to the ipsilateral side.
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They are highly rich in muscle spindles, which are stimulated by stretch
The rotatores muscles are the deepest muscles in the transversospinalis group, the deep layer of intrinsic back muscles. They are highly rich in muscle spindles, which are stimulated by stretch. Muscle spindles are stretch detectors that sense how much and how fast a muscle is lengthened or shortened. They are the proprioceptors of the muscle. When a muscle is stretched, the change in length is transmitted to the spindles and their intrafusal fibres, which are similarly stretched. This stimulation of a reflexive muscle contraction is known as the stretch or myotatic reflex. The strength or degree of the muscle's response is determined by the speed of the stretch, with a more rapid stretch resulting in a greater firing frequency of the motor neuron and a more forceful contraction.
The role of muscle spindles is to inform the central nervous system (CNS) about changes in the length of individual muscles and the speed of stretching. This information is used by the CNS to compute the position and movement of our extremities in space, which is essential for motor control, maintaining posture, and a stable gait. The responses of muscle spindles to changes in length also play a crucial role in regulating muscle contraction by activating motor neurons via the stretch reflex to resist muscle stretch. This response is protective, preventing potential damage when a muscle is stretched beyond its limit.
The stretch reflex is a spinal cord reflex and is completely involuntary. It occurs rapidly to prevent serious injury. For example, when you accidentally step into a pothole and roll your ankle, the spindles within the stretched muscles fire rapid impulses to the nervous system, causing a rapid contraction in the stretched muscles. This results in a minor sprain instead of a completely torn muscle or broken ankle.
The muscle spindle is located in parallel with the extrafusal fibres, and it stretches along with the muscle. It signals muscle length and velocity to the CNS through specialised sensory fibres that innervate the intrafusal fibres. These sensory fibres have stretch receptors that open and close as a function of the length of the intrafusal fibre. Group Ia afferents, or primary afferents, wrap around all three types of intrafusal fibres and provide information about both length and velocity. Group II afferents, or secondary afferents, innervate the ends of the nuclear chain and static nuclear bag fibres.
The rotatores muscles are important stabilisers of the vertebral column and act as extensible ligaments that adjust their length to support adjacent vertebrae. They function as stabilisers, extensors, and rotators of the spine.
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Frequently asked questions
Rotatores muscles are a set of short muscles located laterally along the vertebral column, attaching between the transverse and spinous processes of thoracic vertebrae. They are the deepest and shortest transversospinal muscles.
Rotatores muscles function as stabilizers, extensors and rotators of the spine. They are also identified as thoracic rotators and back extensors.
Ipsilateral rotators refer to the muscles that cause rotation towards the same side. For example, the internal oblique and transversus abdominis are involved in ipsilateral trunk rotation.
