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The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. Neck muscles support the head and enable it to move in different directions. The muscles in the posterior neck are responsible for the extension of the neck, while the lateral neck muscles control head movements from the base of the skull, allowing the head to twist and tilt. The SCM muscle, or sternocleidomastoid, is a large muscle that helps with head rotation and tilting the chin. It is a two-headed muscle that originates from the clavicle and sternum and ascends diagonally to insert onto the mastoid process of the temporal bone. The splenius muscle, which originates at the midline and runs laterally and superiorly, can also extend, laterally flex, and rotate the head.
| Characteristics | Values |
|---|---|
| Number of neck muscles | 30 |
| Muscle that pulls the head backward and rotates the head to the left | Left splenius |
| Muscle that pulls the head forward and rotates the head to the left | Right sternocleidomastoid (SCM) |
| SCM muscle type | Long, superficial, skeletal, voluntary |
| SCM location | Front of the neck |
| SCM function | Helps protect fragile structures within the neck |
| SCM innervation | Accessory nerve (CN XI) and anterior rami of spinal nerves C2 and C3 |
| SCM vascular supply | Branches of the occipital, posterior auricular, superior thyroid and suprascapular artery |
| SCM unilateral contraction function | Lateral flexion of the neck on the same (ipsilateral) side and lateral rotation of the head to the opposite (contralateral) side |
| SCM bilateral contraction function | Flexion of the neck, drawing the head towards the chest |
| SCM function when the head and neck are fixed | Elevate the sternum and clavicle and thereby expand the thoracic cavity during forced inspiration |
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What You'll Learn
The SCM muscle turns the head left
The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. Neck muscles support the head and help with various movements, including chewing, swallowing, and breathing. They also assist in rotating the head from side to side.
The Sternocleidomastoid (SCM) muscle is a large, two-headed muscle in the neck. It attaches to the bony mastoid process on the skull and travels down the front of the neck to connect to the sternum and collarbone. The SCM muscle can help in head rotation and tilting the chin. When the head and neck are fixed, the SCM can also elevate the sternum and clavicle, expanding the thoracic cavity during forced inspiration.
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. This means that the right SCM turns the head to the left, and vice versa.
The SCM is a large muscle that also helps protect the fragile structures within the neck. It is a superficial muscle that is easy to palpate on the front of the neck. Other muscles in the neck that assist in head rotation include the splenius muscles, the levator scapulae, the scalene muscles, and the suboccipitals.
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The splenius muscle turns the head left
The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. Neck muscles support the head and help with various movements, including chewing, swallowing, and breathing. They also assist in rotating the head from side to side.
The splenius muscle is one of the neck muscles responsible for turning the head left. Specifically, the left splenius muscle pulls the head backward and rotates it to the left. It is a deep muscle located behind the ear, making it difficult to palpate.
The splenius muscles originate at the midline and run laterally and superiorly to their insertions. They can extend, laterally flex, and rotate the head. From the sides and back of the neck, the splenius capitis inserts into the head region, while the splenius cervicis extends into the cervical region.
Other muscles involved in neck movements include the sternocleidomastoid, trapezius, levator scapulae, scalene muscles, deep cervical flexors, erector spinae, and suboccipitals. These muscles work together with tendons and ligaments to support and move the neck and head, with some specifically aiding in head rotation and tilting.
The neck's flexibility allows for large movements and a wide range of motion when rotating the head. This flexibility is crucial for scanning our surroundings and plays a vital role in our survival.
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The neck has 30 muscles
The neck is a complex structure of bones, muscles, nerves, blood vessels, and connective tissues. It is made up of 30 muscles that support and stabilise the head, neck, and upper spine. These muscles are skeletal muscles, meaning they are attached to bones by tendons. They are also voluntary muscles, so you can control how they move.
The neck muscles are divided into three main groups based on their position in the neck: anterior, lateral, and posterior. The muscles in the anterior group include the platysma and sternocleidomastoid. The lateral neck muscles control head movements from the base of the skull and help twist and tilt the cervical spine. The muscles in the posterior group are responsible for the extension of the neck.
The neck muscles help you perform a variety of movements, such as moving your head in different directions, chewing, swallowing, and breathing. They also assist in making facial expressions. The SCM muscle, for example, is a long, superficial muscle that pulls the head forward and rotates it to the opposite side. On the other hand, the left splenius, a deep muscle behind the ear, pulls the head backward and rotates it to the same side.
Given the importance of the neck in allowing movement and facilitating brain-body communication, injuries to the neck can have significant consequences and, in some cases, be fatal. C1, the atlas, and C2, the axis, are crucial for the range of motion in rotating the head laterally.
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Lateral neck muscles control head movement
The neck is a complex structure of bones, muscles, nerves, blood vessels, and other connective tissues. The neck muscles support the head and enable a range of movements, including chewing, swallowing, and breathing. There are about 30 neck muscles, extending from the base of the skull and jaw down to the collarbone and shoulder blades. These muscles are divided into three main groups based on their position in the neck: anterior, lateral, and posterior.
The lateral neck muscles control head movements from the base of the skull. They help twist the head from side to side and tilt the cervical spine. The splenius muscle, for example, is a deep muscle behind the ear that turns the head to the left. The sternocleidomastoid muscle, on the other hand, is a long superficial muscle that pulls the head forward and rotates it to the opposite side (right SCM turns the head to the left).
The suboccipital muscles, located just below the occipital bone at the base of the skull, help extend the head in different directions. They can produce movements such as extension, lateral flexion, and rotation of the head at the atlanto-axial joint. The splenius muscle, mentioned earlier, is one of these suboccipital muscles.
The transversospinalis muscles help move the head forward and backward, as well as tilt it from side to side. They also contribute to spine stabilization and movement in the cervical, thoracic, and lumbar regions.
The neck muscles are innervated by various cervical nerves and their branches, with efferent nerves carrying impulses from the spinal cord to control cervical movements. Proper neck movement is vital for survival as it allows us to scan our surroundings and is the conduit for the brain to communicate with the rest of the body.
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Neck muscles help with breathing, chewing and swallowing
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. They also assist with breathing, chewing, and swallowing.
The SCM (sternocleidomastoid) muscle, for example, aids in head and neck extension and flexion, as well as neck rotation. It is a long, superficial muscle that is easily palpable on the front of the neck. The splenius muscle, on the other hand, is a deep muscle located behind the ear that helps with head extension and rotation.
The scalene muscles are involved in breathing by moving the first two ribs up and down, allowing for inhalation. They also help to stabilize the cervical spine. The hyoid bone, which sits below the mandible and in front of the oesophagus, is important for swallowing and speaking. The suprahyoid and infrahyoid muscles, located relative to the hyoid bone, work together to elevate and depress it, respectively, facilitating swallowing and speech.
The neck muscles also include the lateral neck muscles, which control head movements from the base of the skull, allowing for twisting and tilting of the head and cervical spine. The suboccipital muscles, located just below the occipital bone, help extend the head in different directions. Additionally, the transversospinalis muscles enable forward and backward head movement, as well as side-to-side tilting.
While the neck muscles play a crucial role in various functions, they are also susceptible to injuries. Strains and sprains in the neck muscles are common and usually not serious, but in rare cases, immediate medical attention is required for severe neck injuries.
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