Occipitofrontalis muscle: Difference between revisions

Latest revision as of 21:20, 23 February 2025

The occipitofrontalis muscle, also known as the epicranius, is a muscle of the human skull that covers parts of the skull's surface. It consists of two parts or bellies: the occipital belly near the occipital bone and the frontal belly near the frontal bone. These two parts are connected by the epicranial aponeurosis, a tough layer of dense fibrous tissue.

Structure[edit]

The occipitofrontalis muscle is composed of two main parts:

Frontal Belly: This part of the muscle is located at the front of the head. It originates from the epicranial aponeurosis and inserts into the skin of the forehead and the eyebrows.

Occipital Belly: This part is located at the back of the head. It originates from the occipital bone and the mastoid part of the temporal bone. It inserts into the epicranial aponeurosis.

The two bellies are connected by the epicranial aponeurosis, which allows them to work together to move the scalp.

Function[edit]

The primary function of the occipitofrontalis muscle is to move the scalp. The frontal belly is responsible for raising the eyebrows and wrinkling the forehead, which is an important aspect of facial expression. The occipital belly assists in retracting the scalp.

Innervation[edit]

The occipitofrontalis muscle is innervated by the facial nerve (cranial nerve VII). Specifically, the frontal belly is innervated by the temporal branch of the facial nerve, while the occipital belly is innervated by the posterior auricular branch.

Blood Supply[edit]

The blood supply to the occipitofrontalis muscle is provided by branches of the external carotid artery, including the occipital artery and the superficial temporal artery.

Clinical Significance[edit]

The occipitofrontalis muscle plays a crucial role in non-verbal communication through facial expressions. Dysfunction of this muscle, such as in Bell's palsy, can lead to an inability to raise the eyebrows or wrinkle the forehead on the affected side.

Related Pages[edit]

Gray378

@@ Line 1: / Line 1: @@
-'''Occipitofrontalis muscle''' is a muscle which covers parts of the skull. It consists of two parts or bellies, the [[Occipital belly|occipital belly]] and the [[Frontal belly|frontal belly]]. The occipital belly, near the [[Occipital bone|occipital bone]], and the frontal belly, near the [[Frontal bone|frontal bone]], are connected by the [[Galea aponeurotica|galea aponeurotica]].
+The '''occipitofrontalis muscle''', also known as the '''epicranius''', is a muscle of the human [[skull]] that covers parts of the [[skull|skull's]] surface. It consists of two parts or bellies: the occipital belly near the occipital bone and the frontal belly near the frontal bone. These two parts are connected by the [[epicranial aponeurosis]], a tough layer of dense fibrous tissue.
-==Structure==
+== Structure ==
-The occipitofrontalis muscle is made up of two parts: the occipital belly and the frontal belly. The occipital belly originates from the [[Occipital bone|occipital bone]] and the [[Mastoid process|mastoid process]] of the [[Temporal bone|temporal bone]]. It inserts into the [[Galea aponeurotica|galea aponeurotica]]. The frontal belly originates from the [[Epicranial aponeurosis|epicranial aponeurosis]] and inserts into the skin of the eyebrows and the root of the nose.
-==Function==
+The occipitofrontalis muscle is composed of two main parts:
-The occipitofrontalis muscle helps in the movement of the scalp, eyebrows, and forehead. The occipital belly pulls the scalp back, while the frontal belly raises the eyebrows and wrinkles the forehead.
-==Clinical significance==
+* '''Frontal Belly''': This part of the muscle is located at the front of the head. It originates from the [[epicranial aponeurosis]] and inserts into the skin of the forehead and the [[eyebrows]].
-Damage to the occipitofrontalis muscle can lead to conditions such as [[Brow ptosis|brow ptosis]], which is a drooping or falling of the eyebrow. It can also cause [[Headache|headaches]] due to tension in the muscle.
-==See also==
+* '''Occipital Belly''': This part is located at the back of the head. It originates from the [[occipital bone]] and the mastoid part of the [[temporal bone]]. It inserts into the epicranial aponeurosis.
-* [[List of muscles of the human body]]
-* [[Facial muscles]]
+The two bellies are connected by the epicranial aponeurosis, which allows them to work together to move the scalp.
-* [[Scalp]]
+== Function ==
+The primary function of the occipitofrontalis muscle is to move the scalp. The frontal belly is responsible for raising the eyebrows and wrinkling the forehead, which is an important aspect of facial expression. The occipital belly assists in retracting the scalp.
+== Innervation ==
+The occipitofrontalis muscle is innervated by the [[facial nerve]] (cranial nerve VII). Specifically, the frontal belly is innervated by the temporal branch of the facial nerve, while the occipital belly is innervated by the posterior auricular branch.
+== Blood Supply ==
+The blood supply to the occipitofrontalis muscle is provided by branches of the [[external carotid artery]], including the occipital artery and the superficial temporal artery.
+== Clinical Significance ==
+The occipitofrontalis muscle plays a crucial role in non-verbal communication through facial expressions. Dysfunction of this muscle, such as in [[Bell's palsy]], can lead to an inability to raise the eyebrows or wrinkle the forehead on the affected side.
-==References==
+== Related Pages ==
-<references />
-{{stub}}
+* [[Facial muscles]]
+* [[Facial nerve]]
+* [[Epicranial aponeurosis]]
+* [[Skull]]
 [[Category:Muscles of the head and neck]]
-[[Category:Facial muscles]]
+<gallery>
-[[Category:Scalp]]
+File:Gray378.png|Gray378
+</gallery>