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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. It is supplied by the supraorbital artery, the supratrochlear artery, and the occipital artery.
Origin: Superior nuchal line of the occipital bone and mastoid process of the temporal bone: Insertion: Galea aponeurosis: Artery: Occipital artery: Nerve: Posterior auricular nerve (a branch of the facial nerve) Actions: Moves the scalp back: Identifiers; Latin: venter occipitalis musculi occipitofrontalis: TA98: A04.1.03.005: TA2: 2057: FMA ...
Some sources consider the frontalis muscle to be a distinct muscle. However, Terminologia Anatomica currently classifies it as part of the occipitofrontalis muscle along with the occipitalis muscle. [2] In humans, the frontalis muscle only serves for facial expressions. [3]
Origin Insertion Raising eyebrows (e.g., showing surprise) Skin of scalp: Anterior: Occipitofrontalis frontal belly: Epicraneal aponeurosis: Underneath skin of forehead Tensing and retracting scalp: Skin of scalp: Posterior: Occipitofrontalis, occipital belly: Occipital bone; mastoid process (temporal bone) Epicraneal aponeurosis
Insertion The attachment point of the muscle, on a bone or otherwise, that moves during the action. Artery The artery which supplies the muscle with blood. The term "artery" is included to avoid confusing columns. Nerve The nerve(s) which tell the muscle to act (innervates the muscle). The term "nerve" is included for clarity. Action
It merges with the occipitofrontalis muscle. In front, it forms a short and narrow prolongation between its union with the frontalis muscle (the frontal part of the occipitofrontalis muscle). On either side, the epicranial aponeurosis attaches to the anterior auricular muscles and the superior auricular muscles .
The epicranial aponeurosis is a tough layer of dense fibrous tissue that covers the upper part of the skull.. The epicranial muscle (also called the epicranius) has two sections: the occipital belly, near the occipital bone, and the frontal belly, near the frontal bone.
[4] [5] The overlying muscles are the occipitofrontalis, procerus, and corrugator supercilii muscles, all of which are controlled by the temporal branch of the facial nerve. [2] The sensory nerves of the forehead connect to the ophthalmic branch of the trigeminal nerve and to the cervical plexus, and lie within the subcutaneous fat.