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The neck is a complex structure made up of cervical vertebrae, muscles, ligaments, and nerves. The cervical spine, or neck, is composed of seven vertebrae, with the first two, C1 and C2, known as atypical vertebrae due to their unique structure and function. The cervical spine provides bony protection for the spinal cord and supports the weight of the skull, allowing for a range of movements, including cervical extension, or bending the head backward. The neck musculature can be divided into anterior, lateral, and posterior groups, with further subdivisions based on depth, location, and function. The deep neck extensors (DCE) are a group of intrinsic back muscles that provide stability and control for the neck, working in conjunction with the deep cervical flexors. Dysfunction of these muscles can lead to pain and functional restrictions, as observed in patients with neck pain. Understanding the anatomy and function of the cervical extensors is crucial for effective rehabilitation and treatment approaches.
| Characteristics | Values |
|---|---|
| Definition | Bending the head backward with the face towards the sky |
| Muscles Involved | Semispinalis cervicis, Multifidus, Levator scapulae, Upper trapezius, Splenius capitis, Splenius cervicis, Semispinalis capitus, Rectus capitus posterior major, Rectus capitus posterior minor, Obliquus capitus superior, Obliquus capitus inferior |
| Muscle Structure | Four layers |
| Muscles Function | Control cervical segmental movements, maintain head posture, stabilise spine, support the spine, hold it upright, control movement during rest and activity |
| Related Disorders | Neck pain, Cervical dystonia, Spasmodic torticollis |
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What You'll Learn
- The deep neck extensors (DCE) provide stability and control for the neck
- The cervical spine has seven vertebrae, with eight pairs of cervical nerves
- Neck extensor muscles need strength to control the head, which weighs around 4.5kg
- The neck musculature is comprised of anterior, lateral, and posterior groups
- The Head/Neck Extension Test can be used to assess cervical extensor muscle balance
The deep neck extensors (DCE) provide stability and control for the neck
The deep neck extensors (DCE) are a group of muscles that provide stability and control for the neck. They are responsible for controlling the segmental movements of the cervical spine, in conjunction with the deep cervical flexors. The neck extensor muscles must be strong enough to control the head, which weighs around 4.5kg on average.
The DCE muscles are part of the deepest layer of intrinsic back muscles, known as the transversospinalis group. They include the semispinalis cervicis, which acts as a cervical extender and maintains head posture, and the multifidus, which acts as a segmental stabiliser as the spine moves. The unique structure of the multifidus is believed to endow it with extra strength.
The DCE muscles provide posterior support for cervical lordosis and work with the deep neck flexors to prevent a forward head position. If the DCE muscles become impaired, it can lead to functional restrictions and pain, particularly in the neck and cervical spine. Research has shown that both the cervical flexors and extensors lose strength and endurance when neck pain is present, and co-activation ceases, especially during functional tasks.
The behaviour of the deep neck extensors may be altered in patients with neck pain. Studies have found reduced activation of the DCE muscles and less defined activation patterns in patients with neck pain. These changes in function can affect the support and control of the cervical spine, potentially leading to overload on specific segments. Therapeutic exercises have been developed to address such dysfunctions and alleviate pain.
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The cervical spine has seven vertebrae, with eight pairs of cervical nerves
The cervical spine is the neck region of the spinal column or backbone. It consists of the first seven bones, C1-C7, which are also known as the cervical vertebrae. These vertebrae are connected at the back by facet joints, which allow for the forward, backward, and twisting motions of the neck. The cervical spine functions as the spinal cord's bony protection as it exits the cranium.
Despite there being only seven cervical vertebrae, there are eight pairs of cervical nerves, termed C1 to C8. The first seven cervical nerves (C1-C7) exit the spine cranially to their associated vertebrae, while the eighth cervical nerve (C8) exits caudally to C7. These nerves exit through small openings (foramen) between each pair of vertebrae in the cervical spine. They stimulate muscle movement in the neck, shoulder, arm, and hand, and provide sensation.
Cervical nerves C1, C2, and C3 control forward, backward, and side head and neck movements. C2 provides sensation to the upper area of the head, while C3 gives sensation to the side of the face and back of the head. Cervical nerve C4 controls upward shoulder motion and is one of the nerves that control the diaphragm, the muscle at the bottom of the rib cage that helps with breathing.
The cervical vertebrae serve as the origination and insertion points for a host of muscles that support and enable movement of the head and neck. The neck musculature can be divided into anterior, lateral, and posterior groups based on their position in the neck. They can be further divided into intrinsic and extrinsic muscles and categorized according to their function, such as flexion, extension, or rotation.
The deep neck extensors (DCE) provide stability and control for the neck. They belong to the deepest layer of intrinsic back muscles, the transversospinalis group. The DCE muscles include the semispinalis cervicis, which acts as a cervical extender and maintains head posture, and the multifidus, which acts as a segmental stabilizer as the spine moves.
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Neck extensor muscles need strength to control the head, which weighs around 4.5kg
The neck is a complex musculoskeletal system that connects the base of the skull to the torso. It is comprised of around 30 muscles that support and stabilise the head, neck, and upper spine. The neck muscles are skeletal muscles, meaning they are attached to bones by tendons. They are voluntary muscles, so we control how they move and work.
The neck muscles help us perform a variety of movements, from chewing and swallowing to moving our head and controlling our breathing. They also provide stability and control for the neck and are anatomically able to control segmental movements of the cervical spine in concert with the deep cervical flexors. The deep neck extensors (DCE) muscles belong to the deepest layer of intrinsic back muscles, the transversospinalis group. They provide posterior support of cervical lordosis in synergy with the deep neck flexors and prevent a forward head position.
The DCE muscles include the semispinalis cervicis, which acts as a cervical extender and maintains head posture, and the multifidus, which acts as a segmental stabiliser as the spine moves. It is thought that the unique design of the multifidus endows it with extra strength. If the DCE muscles become impaired, for example in cervical spine disorders, this will lead to key functional restrictions and pain.
The neck extensor muscles need to control the head, which weighs around 4.5kg on average, and for this, they need sufficient strength. In the quadruped neck retraction/extension exercise, the neck extensors must contract to hold the head and neck in proper alignment against gravity.
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The neck musculature is comprised of anterior, lateral, and posterior groups
The neck is a complex structure that serves as a bridge between the head and the rest of the body. It is composed of several muscles, ligaments, bones, and joints that work together to provide stability, support, and a wide range of movements. The neck musculature can be divided into several groups based on their location and function, including anterior, lateral, and posterior groups.
The anterior neck muscles, also known as the prevertebral muscles, play a crucial role in maintaining the posture and stability of the neck. These muscles include the sternocleidomastoid, which is a prominent muscle that aids in head and neck extension, neck flexion, and rotation. It also assists in elevating the clavicle and sternal manubrium. Another important anterior neck muscle is the platysma, which contributes to the depression of the mandible and angle of the mouth, and affects the tension of the skin in the lower face and anterior neck.
The lateral neck muscles include the suprahyoids, such as the digastric, mylohyoid, geniohyoid, and stylohyoid muscles. These muscles have a range of functions, including assisting with swallowing, speech, and maintaining the position of the tongue.
The posterior neck muscles are a group of deep neck extensors (DCE) that provide stability, control, and support for the neck and head. These muscles belong to the deepest layer of intrinsic back muscles, known as the transversospinalis group. The semispinalis cervicis is a key muscle within this group, acting as a cervical extender and maintaining head posture. Another important muscle in this group is the multifidus, which acts as a segmental stabiliser, providing additional support for the spine during movements.
The deep neck extensors play a crucial role in controlling the head, which can weigh around 4.5kg. These muscles work in synergy with the deep neck flexors to prevent a forward head position and maintain the cervical lordosis, the natural curve of the neck. Impairment of these muscles, such as in cervical spine disorders, can lead to functional restrictions and pain.
In summary, the neck musculature is comprised of anterior, lateral, and posterior groups, each contributing to the overall stability, movement, and functionality of the neck and head. These muscle groups work in coordination with ligaments and bones to enable a wide range of motions, including flexion, extension, rotation, and side-bending.
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The Head/Neck Extension Test can be used to assess cervical extensor muscle balance
The Head/Neck Extension Test is a useful method to assess cervical extensor muscle balance. It is a simple test that can reveal a lot about the patient's neck musculature. The patient is asked to lie prone with their head and neck extended off an examination table. The patient then attempts to lift their head off the table. The pattern of muscle contraction is assessed as the head lifts.
Under normal circumstances, the Levator Scapula and Upper Trapezius should remain relaxed. This can be confirmed by palpating these muscles during the movement. If these muscles are active, it indicates an undesirable compensatory pattern where the scapulo-cervical muscles are dominant over the cervical extensors.
In addition to testing the active range, strength can also be assessed. With the head and neck extended off the table, gentle pressure is applied to the patient's head into flexion. The patient should be able to resist this pressure without additional muscle activity of the scapulo-thoracic muscles.
Failure of any part of the Head/Neck Extension Test indicates cervical extensor dysfunction. This can manifest as a weakness of the deep neck extensors, with the 'chin length' increasing with neck extension, indicating the dominance of superficial extensors. There may also be hyper-extension of the upper cervical spine, with excessive flexion and anterior shear of the lower cervical spine.
The deep neck extensors (DCE) are a group of intrinsic back muscles that provide stability and control for the neck. They control the segmental movements of the cervical spine in conjunction with the deep cervical flexors. The deep neck extensors include the semispinalis cervicis, which acts as a cervical extender and maintains head posture, and the multifidus, which acts as a segmental stabiliser as the spine moves.
The cervical spine has seven cervical vertebrae, with eight pairs of cervical nerves, termed C1 to C8. The cervical vertebrae are the origination and insertion points for muscles that support and enable movement of the head and neck. These muscles can be divided into anterior, lateral, and posterior groups, and further categorised by function, such as flexion, extension, or rotation.
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Frequently asked questions
Cervical extension is the act of bending the head backward with the face towards the sky.
The muscles involved in cervical extension include the levator scapulae, upper trapezius, splenius capitus, semispinalis cervicis, and multifidus.
The cervical extensors provide stability and control for the neck, allowing for head and eye movements while maintaining balance and visual function.
Aerobic exercises such as walking and strength training for the neck and shoulders can help strengthen the cervical extensors and alleviate neck pain. Specific neck extensor exercises, such as chin tucks and quadruped neck retractions, can also be performed.
