Occipitofrontalis
| Occipitofrontalis | |
|---|---|
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| Details | |
| Origin | Two occipital bellies and two frontal bellies. |
| Insertion | Galea aponeurotica |
| Artery |
Frontal belly: supraorbital and supratrochlear arteries Occipital belly: Occipital artery |
| Nerve | Facial nerve |
| Actions | Raises eyebrows, wrinkles forehead |
| Identifiers | |
| Latin | Musculus occipitofrontalis or Musculus epicranii venter frontalis |
| Dorlands /Elsevier |
m_22/12549942 |
| TA | A04.1.03.003 |
| FMA | 9624 |
|
Anatomical terms of muscle
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The occipitofrontalis muscle (epicranius muscle) is a muscle which covers parts of the skull. It consists of two parts or bellies: The occipital belly, near the occipital bone, and the frontal belly, near the frontal bone. In humans, the occipitofrontalis only serves for facial expressions.
Some sources consider the occipital and frontal bellies to be two distinct muscles. However, Terminologia Anatomica currently classifies it as a single muscle, and also includes the temporoparietalis muscle as part of the epicranius.
The occipitofrontalis muscle receives blood from several arteries. The frontal belly receives blood from the supraorbital and supratrochlear arteries, while the occipital belly receives blood from the occipital artery. The occipitofrontalis muscle is innervated by the facial nerve.
The occipital belly originates on the lateral two-thirds of the superior nuchal line, and on the mastoid process of the temporal bone. Inserted into the galea aponeurotica, or epicranial aponeurosis, the occipital belly communicates with the frontal belly by an intermediate tendon. From the aponeurosis, the frontal belly is inserted in the fascia of the facial muscles and in the skin above the eyes and nose.
Assisted by the occipital belly, the frontal belly draws the scalp back which raises the eyebrows and wrinkles the forehead.
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Wikipedia