Table of Contents
- 1 What action does the temporalis muscle do?
- 2 What is the function of the temporalis muscle quizlet?
- 3 What is temporal muscle wasting?
- 4 What movement does the Sternocleidomastoid produce?
- 5 What is the action of the orbicularis oris?
- 6 What muscle helps control the movement of the head?
- 7 What are the signs of muscle loss?
- 8 What does Splenius capitis do?
What action does the temporalis muscle do?
The temporalis muscle is one of the muscles of mastication. It is responsible for both closing the mouth and retraction (posterior fibers).
What is the function of the temporalis muscle quizlet?
Temporalis Function: Elevates the mandible- closing the jaw. Contraction of the posterior fibers retracts the mandible. What muscle is this?
Is the temporalis muscle a prime mover?
The muscles that move the lower jaw are typically located within the cheek and originate from processes in the skull….Muscles That Move the Lower Jaw.
| Muscles of the Lower Jaw | Target | Mandible |
|---|---|---|
| Target motion direction | Superior (elevates); posterior (retracts) | |
| Prime mover | Temporalis | |
| Origin | Temporal bone | |
| Insertion | Mandible |
What is temporal muscle wasting?
Temple hollowing, also known as temporal atrophy or temporal wasting occurs when the temple shrinks causing a hollowed out appearance to the temple. When severe, it can give your head the shape of a peanut. This is because temple hollowing changes the shape of your face from a “heart” to a “rectangle”.
What movement does the Sternocleidomastoid produce?
Function. Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head.
Where is the temporalis muscle?
temporal fossa
The temporalis muscle attaches above to the bone and fascia in the temporal fossa, superior to the zygomatic arch, and below to the coronoid process of the mandible and along the mandibular ramus (Figure 6-17). The temporalis muscles primarily close the jaw while the middle fibers bilaterally retrude the mandible.
What is the action of the orbicularis oris?
Orbicularis oris muscle
| Orbicularis oris | |
|---|---|
| Nerve | cranial nerve VII, buccal branch |
| Actions | It is sometimes known as the kissing muscle because it is used to pucker the lips. |
| Identifiers | |
| Latin | musculus orbicularis oris |
What muscle helps control the movement of the head?
sternocleidomastoid
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.
What causes atrophy of the temporalis muscle?
Atrophy of the superficial temporal fat pad—caused by ischemia, denervation, or displacement through dissection, disinsertion, or atrophy of the temporalis muscle caused by injury to the frontal branch of the facial nerve—may result in temporal hollowing.
What are the signs of muscle loss?
In addition to reduced muscle mass, symptoms of muscle atrophy include:
- having one arm or leg that is noticeably smaller than the others.
- experiencing weakness in one limb or generally.
- having difficulty balancing.
- remaining inactive for an extended period.
What does Splenius capitis do?
Function. Bilaterally, the splenius capitis muscles extend and hyper-extend the head and neck. However, acting unilaterally, the muscle flexes and rotates the head and neck to the same side; particularly in the superior and inferior lateral oblique movements.
Which muscle is responsible for turning the head?
The sternocleidomastoid muscle, commonly called the SCM, 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.