Dominic Stone
The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. There are about 30 neck muscles, which support the head and neck and enable a range of movements, including chewing, swallowing, and breathing. These muscles are divided into three main categories: anterior (front), lateral (side), and posterior (back). The largest muscle in the front of the neck is the sternocleidomastoid (SCM), which allows the neck to bend and the head to turn or tilt. SCM injuries and tension can lead to pain and stiffness, which can be treated with stretching, physical therapy, and osteopathic manipulation.
| Characteristics | Values |
|---|---|
| Number of neck muscles | 30 |
| Muscle groups | 3-4 |
| Muscle categories | Anterior (front), lateral (side), posterior (back) |
| Anterior subgroups | Superficial, suprahyoid, infrahyoid, scalene |
| Posterior subgroups | Suboccipitals, rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, obliquus capitis inferior, scalene |
| Lateral subgroups | Scalene |
| Muscle functions | Support and stabilise the head, neck, and upper spine; enable head movement; assist with chewing, swallowing, and breathing |
| Muscle attachments | Bones, tendons, ligaments |
| Muscle innervation | Cervical nerves, cranial nerves, spinal cord |
| Muscle contraction | Occurs when efferent nerves carry impulses from the spinal cord |
| Muscle movement | Flexion, extension, rotation, side-bending |
| Muscle injuries | Strains, tears, stiffness, pain |
| Muscle treatments | Stretching, hot/cold therapy, massage, osteopathic manipulation, physical therapy, surgery, stress management, posture improvement |
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What You'll Learn
- The SCM muscle is the largest muscle in the front of the neck
- The neck's cervical spine supports the skull and allows for movement
- The neck's muscles are connected to the bones by tendons
- The neck has three main muscle groups: anterior, lateral, and posterior
- The neck has about 30 muscles, which help with chewing, swallowing, and breathing
The SCM muscle is the largest muscle in the front of the neck
The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. The cervical spine, or neck, is the most flexible part of the spine, allowing for large movements to scan our surroundings. The neck muscles support the cervical spine and enable movements of the head, neck, upper back, and shoulders.
There are about 30 neck muscles, divided into three main categories: anterior (front), lateral (side), and posterior (back). The SCM muscle, or sternocleidomastoid muscle, is the largest muscle in the front of the neck. It is a powerful neck muscle that allows you to bend your neck and turn or tilt your head. The SCM muscle is attached to a small bone behind the ear (mastoid process) and travels down the front of the neck to attach to both the sternum and collarbone.
The SCM muscle has two heads: the clavicular head, which originates from the clavicle, and the sternal head, which arises from the manubrium of the sternum. These heads come together and ascend diagonally to insert into the mastoid process of the temporal bone. The function of the SCM muscle depends on whether it acts alone or with its counterpart on the other side. Unilateral contraction of the SCM muscle produces lateral flexion of the neck on the same side and lateral rotation of the head to the opposite side.
The SCM muscle is innervated by the accessory nerve (CN XI) and anterior rami of spinal nerves C2 and C3. Its blood supply comes from branches of the occipital, posterior auricular, superior thyroid, and suprascapular arteries. Injuries and tension in the SCM muscle can lead to pain and stiffness, requiring treatments such as stretching, physical therapy, and osteopathic manipulation.
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The neck's cervical spine supports the skull and allows for movement
The neck is a complex structure of bones, muscles, nerves, blood vessels, lymphatics, and other connective tissues. The neck muscles support the head and help with a variety of movements, including chewing, swallowing, and breathing. There are about 30 neck muscles, which can be categorised into three main groups: anterior (front), lateral (side), and posterior (back). These muscles are attached to bones by tendons and are voluntary, meaning we can control their movement.
The neck's cervical spine, or the bony part of the neck, supports the skull and allows for movement. It is the most flexible part of the spine, consisting of seven stacked vertebrae (C1 to C7) that form a protective central canal for the spinal cord. The first vertebra, C1, also known as the atlas, is a ring-shaped bone that supports the skull at the atlanto-occipital joint. C1 articulates with the occipital condyles of the occiput bone of the skull, forming the occipital-atlanto (OA) joint. This joint connects the skull to the neck and provides attachment points for some neck muscles. It also bears the weight of the skull, which is about 10 to 13 pounds on average.
The primary motions of the OA joint are flexion and extension, allowing the head and neck to tilt forward and backward, respectively. The dens, a bony structure, projects upward from the vertebral body of C2, or the axis, and articulates with C1. This structure permits a pivoting motion and enables a greater range of motion when rotating the head laterally. The primary motion of the upper portion of the lower cervical unit (C2-C4) is rotation, while the lower portion's primary motion is side-bending.
The cervical spine provides stability and maintains the head position, allowing the eyes to be parallel to the ground. This is crucial for vestibular function and balance. The flexibility of the cervical spine allows for large movements to scan our surroundings and adjust to our environment. It also aids in swallowing and elevating the rib cage during inhalation. The vertebral bodies and muscles of the neck protect the spinal cord, vertebral arteries, and other neurovascular structures necessary for sustaining life.
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The neck's muscles are connected to the bones by tendons
The neck is a complex structure of bones, muscles, nerves, blood vessels, and other connective tissues. The neck muscles are part of a complex musculoskeletal system that connects the base of the skull to the torso. There are about 30 neck muscles that extend from the base of the skull and jaw down to the shoulder blades and collarbone. These muscles support and stabilise the head, neck, and the upper part of the spine. They also help move the head in different directions and assist with chewing, swallowing, and breathing.
The neck muscles are skeletal muscles, meaning they are attached to bones by tendons. They are voluntary muscles, so you have control over how they move and work. Neck muscles can be categorised into three main groups based on their position in the neck: anterior (front), lateral (side), and posterior (back). The anterior neck muscles are further divided into four subgroups: superficial, suprahyoid, infrahyoid, and scalene muscles. The superficial muscles are some of the largest muscles in the neck and include the platysma and sternocleidomastoid. The suprahyoid muscles are located just below the jawline and include the digastric, mylohyoid, geniohyoid, and stylohyoid. The infrahyoid muscles are found below the hyoid bone and consist of the sternohyoid, omohyoid, sternothyroid, and thyrohyoid. The scalene muscles move the first two ribs up and down during inhalation and help stabilise the bones in the neck.
The lateral neck muscles control head movements from the base of the skull. The posterior neck muscles are responsible for the extension of the neck. The suboccipital muscles, located just below the occipital bone at the base of the skull, help extend the head in different directions. The transversospinalis muscles help move the head forward and backward and from side to side. They also help stabilise the spine.
The neck muscles contain fibres that contract, allowing for various movements. The cervical spine, the bony part of the neck, supports the skull while allowing for movement. It is the most flexible part of the spine, enabling large movements to scan our surroundings. Proper neck movement is vital for survival as it serves as a conduit for the brain to communicate with the rest of the body.
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The neck has three main muscle groups: anterior, lateral, and posterior
The neck is a complex structure of bones, muscles, nerves, blood vessels, lymphatics, and other connective tissues. The neck muscles support the cervical spine and enable head movement in all directions. They also assist with chewing, swallowing, and breathing.
The neck has three main muscle groups: anterior (front), lateral (side), and posterior (back). These groups can be further divided based on depth, location, and function. The muscles in the posterior neck are responsible for extending the neck, while the lateral neck muscles control head movements from the base of the skull.
The anterior neck muscles are a group of muscles covering the front aspect of the neck. They are further divided into three subgroups: superficial, suprahyoid, and infrahyoid muscles. The superficial muscles are some of the largest muscles in the neck, including the platysma and sternocleidomastoid. The suprahyoid muscles are found superior to the hyoid bone and include the digastric, mylohyoid, geniohyoid, and stylohyoid. The infrahyoid muscles are found inferior to the hyoid bone and consist of the sternohyoid, omohyoid, sternothyroid, and thyrohyoid.
The sternocleidomastoid (SCM) is a large, two-headed muscle in the front of the neck. It extends from the mastoid process at the base of the skull to the collarbones and breastbone. The SCM muscle helps with bending, turning, and tilting the head. It also protects some fragile structures, such as the carotid artery.
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The neck has about 30 muscles, which help with chewing, swallowing, and breathing
The neck is a complex structure of bones, muscles, nerves, blood vessels, lymphatics, and other connective tissues. The neck muscles support the head and help with a variety of movements, including chewing, swallowing, and breathing. They also assist in moving the head in different directions.
There are about 30 muscles in the neck, which can be categorised into three main groups based on their position: anterior (front), lateral (side), and posterior (back). These muscles are skeletal muscles, meaning they are attached to bones by tendons. They are voluntary muscles, so we have control over their movement. The neck muscles are innervated by various cervical nerves and their branches and cranial nerves.
The anterior neck muscles are further divided into four subgroups: superficial, suprahyoid, infrahyoid, and scalene muscles. The superficial muscles are some of the largest muscles in the neck and include the platysma and sternocleidomastoid. The suprahyoid muscles are responsible for moving the hyoid bone during swallowing and speaking. The infrahyoid muscles consist of four muscles that move the larynx (voice box) up and down. The scalene muscles move the first two ribs to facilitate inhalation and exhalation. They also help stabilise the bones in the neck (cervical spine).
The lateral neck muscles control head movements from the base of the skull, allowing for twisting and tilting of the head and the cervical spine. The posterior neck muscles include superficial, suboccipital, and transversospinalis muscles. The superficial muscles help extend and rotate the head. The suboccipital muscles rotate the head and extend the neck. The transversospinalis muscles help move the head forward and backward and stabilise the spine.
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Frequently asked questions
Neck muscles are a collection of structures that connect the head to the torso. There are about 30 neck muscles, extending from the base of the skull and jaw down to the shoulder blades and collarbone. They are divided into three main categories: anterior (front), lateral (side), and posterior (back).
Neck muscles support the cervical spine and enable movements of the head, neck, upper back, and shoulders. They also assist with chewing, swallowing, and breathing.
Some examples of neck muscles include the sternocleidomastoid (SCM), trapezius, levator scapulae, and suboccipitals. The SCM is the largest muscle in the front of the neck, and it allows you to bend your neck and turn or tilt your head. The trapezius is a large surface muscle that spans from the base of the skull down the cervical spine and into the mid-back. The levator scapulae muscle helps with lifting the shoulder blade, bending the neck to the side, and rotating the head. The suboccipitals are a group of four small muscles that connect the top of the cervical spine with the base of the skull and facilitate head extension and rotation.
