Corpus: Occipitofrontalis muscle: Unterschied zwischen den Versionen

Aktuelle Version vom 30. Oktober 2024, 16:25 Uhr

Definition

The occipitofrontalis muscle, part of the epicranial muscles, consists of two muscle bellies located at opposite ends of the skull, connected by the galea aponeurotica. It is classified as part of the mimic musculature.

Course

The frontal belly of the muscle originates at the supraorbital margin of the frontal bone and the area around the glabella. Its fibers extend into neighboring facial muscles, including the procerus, corrugator supercilii, and orbicularis oculi muscles.

The occipital belly originates from the highest nuchal line of the occipital bone and, to a lesser extent, from the temporal bone.

The fibers of both muscle bellies run vertically upward and insert into the galea aponeurotica, the tendinous sheet covering the top of the skull.

Morphology

Both muscle bellies have an almost quadrangular shape. The frontal belly of the occipitofrontalis muscle is more prominent and contains longer fibers.

Innervation

The frontal belly of the occipitofrontalis muscle is innervated by the temporal branches of the facial nerve, while the occipital belly is innervated by the posterior auricular nerve, also a branch of the facial nerve.

Function

Contraction of the frontal belly raises the eyebrows and creates horizontal folds in the forehead, commonly associated with expressions of surprise or frowning. The occipital belly pulls the galea aponeurotica backward, stretching it. Together, both bellies facilitate the movement of the scalp.

Clinic

Due to the tension exerted by the occipitofrontalis and temporoparietalis muscles on the galea aponeurotica, scalp injuries often result in gaping wounds.

@@ Zeile 1: / Zeile 1: @@
-{{Raw}}
 ==Definition==
-The '''Musculus occipitofrontalis''' belongs to the Musculi epicranii. It has two muscle bellies located at opposite poles of the skull, which are connected by the galea aponeurotica, and is categorised as mimic musculature.<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/43014-musculus-occipitofrontalis"></dcEmbedUrl>
+The '''occipitofrontalis muscle,''' part of the [[Corpus:Epicranial muscles|epicranial muscles]], consists of two muscle bellies located at opposite ends of the [[Corpus:Skull|skull]], connected by the [[Corpus:Galea aponeurotica|galea aponeurotica]]. It is classified as part of the [[Corpus:Mimic musculature|mimic musculature]].<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/43014-musculus-occipitofrontalis"></dcEmbedUrl>
 <dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/43015-musculus-occipitofrontalis"></dcEmbedUrl></dcembed>
 ==Course==
-The '''venter frontalis''' of the muscle - also known as the frontalis muscle - has its ''origin'' at the margo supraorbitalis of the frontal bone (os frontale) and in the area of the glabella. Its fibres radiate into neighbouring mimic muscles, including the procerus muscle, the corrugator supercilii muscle and the orbicularis oculi muscle.
+The '''frontal belly''' of the muscle originates at the supraorbital margin of the [[Corpus:Frontal bone|frontal bone]] and the area around the [[Corpus:Glabella|glabella]]. Its fibers extend into neighboring [[Corpus:Facial muscles|facial muscles]], including the [[Corpus:Procerus muscle|procerus]], [[Corpus:Corrugator supercilii muscle|corrugator supercilii]], and [[Corpus:Orbicularis oculi muscle|orbicularis oculi muscles]].
-The '''venter occipitalis''' - also known as the occipitalis muscle - has its ''origin'' at the linea nuchae suprema of the occipital bone and, to a lesser extent, at the temporal bone.
+The '''occipital belly''' originates from the highest nuchal line of the [[Corpus:Occipital bone|occipital bone]] and, to a lesser extent, from the [[Corpus:Temporal bone|temporal bone]].
-The fibre tracts of both muscle bellies run vertically cranially and radiate into the tendon plate of the skull roof, the galea aponeurotica, where they find their ''insertion''.
+The fibers of both muscle bellies run vertically upward and insert into the galea aponeurotica, the tendinous sheet covering the top of the skull.<dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/4c8e0e8a77384150aa6d4514e3ba8ca9" ui_controls="1"></dcembedurlskatchfab></dcembed>
-<dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/4c8e0e8a77384150aa6d4514e3ba8ca9" ui_controls="1"></dcembedurlskatchfab></dcembed>
 ==Morphology==
-Both muscle bellies have an almost quadrangular outline. The venter frontalis of the occipitofrontalis muscle is more pronounced and has longer fibres.
+Both muscle bellies have an almost quadrangular shape. The frontal belly of the occipitofrontalis muscle is more prominent and contains longer fibers.
 ==Innervation==
-The venter frontalis of the occipitofrontalis muscle is innervated by the temporal rami of the facial nerve, the venter occipitalis by the posterior auricular nerve, also a branch of the facial nerve.
+The frontal belly of the occipitofrontalis muscle is innervated by the temporal branches of the [[Corpus:Facial nerve|facial nerve]], while the occipital belly is innervated by the [[Corpus:Posterior auricular nerve|posterior auricular nerve]], also a branch of the facial nerve.
 ==Function==
-The contraction of the venter frontalis raises the eyebrows and places the forehead skin in horizontal folds (frown). The venter occipitalis stretches the galea aponeurotica by pulling it dorsally. Both bellies move the scalp through their muscular action.
+Contraction of the frontal belly raises the [[Corpus:Eyebrow|eyebrows]] and creates horizontal folds in the [[Corpus:Forehead|forehead]], commonly associated with expressions of surprise or frowning. The occipital belly pulls the galea aponeurotica backward, stretching it. Together, both bellies facilitate the movement of the scalp.
 <dcembed ratio="16x9"><dcembedurl src="https://www.doccheck.com/de/detail/videos/4145-musculus-frontalis"></dcembedurl></dcembed>
 ==Clinic==
-Due to the exciting action of the occipitofrontalis muscle and the temporoparietalis muscle on the galea aponeurotica, injuries to the scalp usually result in a gaping wound.
+Due to the tension exerted by the occipitofrontalis and [[Corpus:Temporoparietalis muscle|temporoparietalis muscles]] on the galea aponeurotica, scalp injuries often result in gaping wounds.
 [[Kategorie:Corpus]]
 [[Kategorie:Head]]
 [[Kategorie:Muscle]]