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The base of the skull, also known as the cranial base or cranial floor, is composed of the endocranium and the lower parts of the calvaria. The skull provides structural support and protection to the cerebrum, cerebellum, brainstem, orbits, and neurovascular structures. It also supports the muscles of the face and scalp and allows neurovascular passage between intracranial and extracranial anatomy. Neck muscles, which control head movements, originate just beneath the base of the skull and extend down the back, near the middle of the back, around the shoulder blades. These muscles help with chewing, swallowing, and breathing. Tension in the neck muscles can cause headaches and pain at the base of the skull, which can be relieved through massage and stretching.
| Characteristics | Values |
|---|---|
| Number of bones in the skull | 22 |
| Number of fontanelles (soft areas where the skull has not ossified) | 6 |
| Bones that make up the base of the skull | Five bones |
| Muscles at the base of the skull | Lateral, Suboccipital, Transversospinalis |
| Functions of the neck muscles | Support the head, enable a range of movements, assist with chewing, swallowing, and breathing |
| Functions of the suboccipital muscles | Facilitate subtle movements between the head and neck, provide postural support, allow rotational and extension movements |
| Functions of the lateral neck muscles | Control head movements, help twist and tilt the cervical spine |
| Functions of the temporalis muscle | Elevate and retract the mandible, assist with chewing |
| Functions of the suprahyoid and infrahyoid muscles | Elevation, depression, protrusion, and retraction |
| Functions of the platysma and sternocleidomastoid muscles | Cervical spine flexion, lateral flexion of the cervical spine, cervical spine rotation, depression/stabilization of the mandible |
| Functions of the orbicularis oris muscle | Moves the lips |
| Functions of the orbicularis oculi muscle | Closes the eye |
| Functions of the buccinator muscle | Allows whistling, blowing, and sucking, contributes to the action of chewing |
| Functions of the occipitofrontalis muscle | Moves up the scalp and eyebrows, draws the eyebrows up and wrinkles the forehead |
| Functions of the masseter muscle | Elevates the mandible (lower jaw) to close the mouth |
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What You'll Learn
- The suboccipital muscles are just below the occipital bone at the base of the skull
- Neck muscles support the head and control head movements from the base of the skull
- Tension headaches can be caused by muscle tension in the muscles surrounding the head and neck
- The skull supports the muscles of the face and scalp
- The skull consists of 22 bones in adult specimens
The suboccipital muscles are just below the occipital bone at the base of the skull
The suboccipital muscles are a group of four muscles located just below the occipital bone at the base of the skull. These muscles are the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior. These four muscles form the suboccipital triangle, an important anatomical landmark that helps localize the vertebral artery and the suboccipital nerve.
The suboccipital muscles provide postural support to the head and neck and enable neck extension and rotation movements. They are innervated by the suboccipital nerve, which is formed by the dorsal ramus of the C1 spinal nerve. The suboccipital nerve is one of the occipital nerves, which run from the spinal cord to the scalp.
The suboccipital muscles are derived from the mesoderm, which interacts with the occipital sclerotomes to form the occipital bone. During embryologic development, derangements in this process can lead to anatomical variations in the suboccipital muscles.
These muscles can be a common source of tension headaches. When tense, they may compress the nerve exiting the base of the skull, triggering headaches. Releasing tension in these muscles through direct and prolonged pressure or massage can help relieve pain and headaches.
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Neck muscles support the head and control head movements from the base of the skull
The neck muscles are at the front, sides, and back of the neck. They support the head and help with a range of movements, including chewing, swallowing, and breathing. Neck muscles also control head movements from the base of the skull.
The neck muscles begin just beneath the base of the skull and extend down near the middle of the back, around the shoulder blades. From the front, these muscles start at the jaw and extend to the collarbone at the top of the chest. There are three main categories of neck muscles: anterior (front), lateral (side), and posterior (back).
The lateral neck muscles control head movements from the base of the skull. They also help twist and tilt the head from side to side and twist and tilt the cervical spine. The superficial muscles in the back of the neck help extend and rotate the head. The suboccipital muscles are just below the occipital bone at the base of the skull. They help extend the head in different directions.
The suboccipital muscles at the base of the skull can be responsible for tension headaches. These muscles facilitate subtle movements between the head and neck and provide postural support. Poor posture, such as slouching and forward head posture, can build tension in these muscles. Releasing tension in these muscles through direct, prolonged pressure or massage is critical to eliminating muscle knots.
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Tension headaches can be caused by muscle tension in the muscles surrounding the head and neck
Tension headaches are the most common type of headache. They can cause constant pain and pressure, as if someone is squeezing the sides of your head. While researchers have not yet found a single cause for tension headaches, they are often associated with muscle tension in the muscles surrounding the head and neck.
The neck muscles support the head and enable a range of movements, including head movements from the base of the skull. They also help with chewing, swallowing, and breathing. There are three main categories of neck muscles: anterior (front), lateral (side), and posterior (back). The lateral neck muscles, for example, help control head movements from the base of the skull, allowing you to twist and tilt your head and cervical spine.
The suboccipital muscles, a group of four pairs of muscles at the base of the skull, are also responsible for subtle movements between the head and neck. They provide postural support and enable rotational and extension movements. When these muscles are tense, they may compress the nerve exiting the base of the skull, triggering tension headaches.
Additionally, the anterior neck muscles, platysma, and sternocleidomastoid, contribute to cervical spine flexion, lateral flexion of the cervical spine, cervical spine rotation, and mandible depression or stabilization. The muscles surrounding the larynx aid in swallowing and positioning the vocal cords.
To relieve muscle tension and tension headaches, direct and prolonged pressure on the suboccipital muscles is recommended.
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The skull supports the muscles of the face and scalp
The skull is a complex structure that provides structural support and protection to the human face. It consists of 22 bones in most adult specimens, which come together through a process called cranial sutures. The skull gives the human face its form, and even minor variations in skull anatomy can lead to significant differences in appearance.
The skull also houses and protects neurovascular structures, including the brain, cerebellum, brainstem, and orbits. Additionally, it accommodates increases in pressure through the presence of various sinuses.
The neck muscles also play a crucial role in supporting the head and neck, facilitating movements such as chewing, swallowing, and breathing. At the base of the skull, a group of muscles called the suboccipital muscles enable subtle movements of the head and neck, providing postural support and allowing rotational and extension movements.
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The skull consists of 22 bones in adult specimens
The skull, or cranium, is a bony enclosure that surrounds and protects the brain of a vertebrate. In the case of humans, the skull is made up of 22 bones in adult specimens, comprising three types: eight cranial bones, fourteen facial bones, and ossicles. The cranial bones are joined at firm fibrous joints called sutures, which contain many foramina, fossae, processes, and sinuses. The largest foramen is the foramen magnum, which allows the passage of the spinal cord, nerves, and blood vessels. The skull also contains air-filled cavities known as paranasal sinuses, which help to lessen the weight of the skull, aid in resonance for the voice, and warm and moisten the air drawn into the nasal cavity.
The facial skeleton is formed by the bones supporting the face, including the mandible, which is the largest bone in the facial skeleton. The facial bones include two maxilla, two nasal bones, two zygomatic bones, two lacrimal bones, two inferior nasal conchae, the vomer, and two palatine bones. Some sources include the hyoid bone or the three ossicles of the middle ear (malleus, incus, and stapes) in their count, but the overall consensus is that there are twenty-two bones in the human skull.
The skull also houses several muscle groups that control movements of the head, neck, and face, as well as chewing and facial expressions. For example, the temporalis muscle, which originates on the temporal fossa of the temporal bone, is involved in elevating and retracting the mandible during chewing. The suboccipital muscles, located just below the occipital bone at the base of the skull, facilitate subtle movements of the head and neck, providing postural support and allowing rotational and extension movements.
The neck muscles support the head and enable a range of movements, including head rotation and extension. They also assist with essential functions such as chewing, swallowing, and breathing. The anterior neck muscles are arranged into four distinct regions: superficial, suprahyoid, infrahyoid, and scalene muscles. The suprahyoid and infrahyoid muscles work together to perform complex movements like swallowing and phonation.
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Frequently asked questions
The suboccipital muscles are attached to the base of the skull. They are a group of four muscles: rectus capitus posterior major, rectus capitus posterior minor, obliquus capitus superior, and obliquus capitus inferior.
The suboccipital muscles help with head extension and rotation. They also serve as postural support for the head and neck.
The skull supports the muscles of the face and scalp. The mastoid process, a large prominence on the skull, serves as an attachment site for the sternocleidomastoid (SCM) muscle. The SCM muscle is attached to a small bone behind the ear and travels down the front of the neck to attach to the sternum and collarbone. The trapezius muscle is also connected to the skull and helps with head and neck extension and rotation.
The skull has a protective function, safeguarding the cerebrum, cerebellum, brainstem, and orbits. It also provides structural support and allows neurovascular passage between intracranial and extracranial anatomy.
The skull consists of 22 bones in adult specimens, which come together via cranial sutures. The occipital bone forms the posterior skull and posterior base of the cranial cavity. The sphenoid bone forms much of the base of the central skull.
