- Identify the axial muscles of the face, head, and neck
- Identify the movement and function of the face, head, and neck muscles
- Muscles That Create Facial Expression
- Muscles That Move the Lower Jaw
- Muscles of the Anterior Neck
- Muscles That Move the Head
- Muscles of the Posterior Neck and the Back
The skeletal muscles are divided into axial
(muscles of the trunk and head) and appendicular
(muscles of the arms and legs) categories. This system reflects the bones of the skeleton system, which are also arranged in this manner. The axial muscles are grouped based on location, function, or both. Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. The first grouping of the axial muscles you will review includes the muscles of the head and neck, then you will review the muscles of the vertebral column, and finally you will review the oblique and rectus muscles.
Muscles That Create Facial Expression
The origins of the muscles of facial expression are on the surface of the skull (remember, the origin of a muscle does not move). The insertions of these muscles have fibers intertwined with connective tissue and the dermis of the skin. Because the muscles insert in the skin rather than on bone, when they contract, the skin moves to create facial expression (Figure 7.18).
Figure 7.18. Muscles of Facial ExpressionMany of the muscles of facial expression insert into the skin surrounding the eyelids, nose and mouth, producing facial expressions by moving the skin rather than bones.
The orbicularis oris
is a circular muscle that moves the lips, and the orbicularis oculi
is a circular muscle that closes the eye. The occipitofrontalis
muscle moves up the scalp and eyebrows. The muscle has a frontal belly and an occipital (near the occipital bone on the posterior part of the skull) belly. In other words, there is a muscle on the forehead (frontalis
) and one on the back of the head (occipitalis
), but there is no muscle across the top of the head. Instead, the two bellies are connected by a broad tendon called the epicranial aponeurosis
, or galea aponeurosis (galea = “apple”). The physicians originally studying human anatomy thought the skull looked like an apple.
The majority of the face is composed of the buccinator
muscle, which compresses the cheek. This muscle allows you to whistle, blow, and suck; and it contributes to the action of chewing. There are several small facial muscles, one of which is the corrugator supercilii
, which is the prime mover of the eyebrows. Place your finger on your eyebrows at the point of the bridge of the nose. Raise your eyebrows as if you were surprised and lower your eyebrows as if you were frowning. With these movements, you can feel the action of the corrugator supercilli. Additional muscles of facial expression are presented in Figure 7.8.
Figure 7.8. Muscles in Facial Expression
Muscles That Move the Lower Jaw
In anatomical terminology, chewing is called mastication
. Muscles involved in chewing must be able to exert enough pressure to bite through and then chew food before it is swallowed (Figure 7.19 and Table 7.4). The masseter
muscle is the main muscle used for chewing because it elevates the mandible (lower jaw) to close the mouth, and it is assisted by the temporalis
muscle, which retracts the mandible. You can feel the temporalis move by putting your fingers to your temple as you chew.
Figure 7.19. Muscles That Move the Lower JawThe muscles that move the lower jaw are typically located within the cheek and originate from processes in the skull. This provides the jaw muscles with the large amount of leverage needed for chewing.
Muscles of the Anterior Neck
The muscles of the anterior neck assist in deglutition (swallowing) and speech by controlling the positions of the larynx (voice box), and the hyoid bone, a horseshoe-shaped bone that functions as a solid foundation on which the tongue can move. The muscles of the neck are categorized according to their position relative to the hyoid bone (Figure 7.20). Suprahyoid muscles
are superior to it, and the infrahyoid muscles
are located inferiorly.
Figure 7.20. Muscles of the Anterior NeckThe anterior muscles of the neck facilitate swallowing and speech. The suprahyoid muscles originate from above the hyoid bone in the chin region. The infrahyoid muscles originate below the hyoid bone in the lower neck.
The suprahyoid muscles raise the hyoid bone, the floor of the mouth, and the larynx during deglutition. These include the digastric
muscle, which has anterior and posterior bellies that work to elevate the hyoid bone and larynx when one swallows; it also depresses the mandible. The stylohyoid
muscle moves the hyoid bone posteriorly, elevating the larynx, and the mylohyoid
muscle lifts it and helps press the tongue to the top of the mouth. The geniohyoid
depresses the mandible in addition to raising and pulling the hyoid bone anteriorly.
The strap-like infrahyoid muscles generally depress the hyoid bone and control the position of the larynx. The omohyoid
muscle, which has superior and inferior bellies, depresses the hyoid bone in conjunction with the sternohyoid
muscles. The thyrohyoid muscle also elevates the larynx’s thyroid cartilage, whereas the sternothyroid
depresses it to create different tones of voice.
Muscles That Move the Head
The head, attached to the top of the vertebral column, is balanced, moved, and rotated by the neck muscles. When these muscles act unilaterally, the head rotates. When they contract bilaterally, the head flexes or extends. The major muscle that laterally flexes and rotates the head is the sternocleidomastoid
. In addition, both muscles working together are the flexors of the head. Place your fingers on both sides of the neck and turn your head to the left and to the right. You will feel the movement originate there. This muscle divides the neck into anterior and posterior triangles when viewed from the side (Figure 7.21).
Figure 7.21. Posterior and Lateral Views of the NeckThe superficial and deep muscles of the neck are responsible for moving the head, cervical vertebrae, and scapulas.
Muscles of the Posterior Neck and the Back
The posterior muscles of the neck are primarily concerned with head movements, like extension. The back muscles stabilize and move the vertebral column, and are grouped according to the lengths and direction of the fascicles.
muscles originate at the midline and run laterally and superiorly to their insertions. From the sides and the back of the neck, the splenius capitis
inserts onto the head region, and the splenius cervicis
extends onto the cervical region. These muscles can extend the head, laterally flex it, and rotate it (Figure 7.22).
Figure 7.22. Muscles of the Neck and BackThe large, complex muscles of the neck and back move the head, shoulders, and vertebral column.
The erector spinae group
forms the majority of the muscle mass of the back and it is the primary extensor of the vertebral column. It controls flexion, lateral flexion, and rotation of the vertebral column, and maintains the lumbar curve. The erector spinae comprises the iliocostalis (laterally placed) group, the longissimus (intermediately placed) group, and the spinalis (medially placed) group.
The iliocostalis group
includes the iliocostalis cervicis
, associated with the cervical region; the iliocostalis thoracis
, associated with the thoracic region; and the iliocostalis lumborum
, associated with the lumbar region. The three muscles of the longissimus group
are the longissimus capitis
, associated with the head region; the longissimus cervicis
, associated with the cervical region; and the longissimus thoracis
, associated with the thoracic region. The third group, the spinalis group
, comprises the spinalis capitis
(head region), the spinalis cervicis
(cervical region), and the spinalis thoracis
muscles run from the transverse processes to the spinous processes of the vertebrae. Similar to the erector spinae muscles, the semispinalis muscles in this group are named for the areas of the body with which they are associated. The semispinalis muscles include the semispinalis capitis
, the semispinalis cervicis
, and the semispinalis thoracis
. The multifidus
muscle of the lumbar region helps extend and laterally flex the vertebral column.
Important in the stabilization of the vertebral column is the segmental muscle group
, which includes the interspinales and intertransversarii muscles. These muscles bring together the spinous and transverse processes of each consecutive vertebra. Finally, the scalene muscles
work together to flex, laterally flex, and rotate the head. They also contribute to deep inhalation. The scalene muscles include the anterior scalene
muscle (anterior to the middle scalene), the middle scalene
muscle (the longest, intermediate between the anterior and posterior scalenes), and the posterior scalene
muscle (the smallest, posterior to the middle scalene).