What is the function of the epicranial aponeurosis?
At the top of your head is the epicranial aponeurosis. It is like a thin helmet beneath the scalp, and provides the attachment sites for the occipitofrontalis muscle, a muscle that controls the eyebrows and facial expressions. The abdominal aponeurosis envelopes the abdominal muscles.
What is the function of the masseter muscle?
The masseter muscle is one of the four muscles responsible for the action of mastication (chewing). When the masseter contracts it causes powerful elevation of the mandible causing the mouth to close.
What is the function of the orbicularis oculi muscle?
Structure and Function The orbicularis oculi muscle closes the eyelids and assists in pumping the tears from the eye into the nasolacrimal duct system. The orbital section of the orbicularis oculi is more involved in the voluntary closure of the eyelid, such as with winking and forced squeezing.
What is the function of the orbicularis oris?
Orbicularis oris muscle along with the buccinator and pharyngeal constrictor form a functional unit, known as “buccinator mechanism” which has an important role in orofacial function (swallowing, sucking, whistling, chewing, vowel pronunciation, kissing).
What is aponeurosis muscle?
aponeurosis, a flat sheet or ribbon of tendonlike material that anchors a muscle or connects it with the part that the muscle moves. The aponeurosis is composed of dense fibrous connective tissue containing fibroblasts (collagen-secreting spindle-shaped cells) and bundles of collagenous fibres in ordered arrays.
Why is aponeurosis different from tendon?
Key Difference The main difference is that Aponeurosis connects the muscles of the body to other muscles which necessitate help, while the tendons serve as a link between the muscles and the bones.
What is the function of the buccinator muscle?
Buccinator muscle plays a role in stabilizing the denture by gripping the polished surface of the denture. Also, the longitudinal fibers hold the bolus of food between the teeth during mastication.
What is the function of the epicranial muscle?
The epicranial muscle, also called the epicranius, consists of two sections and covers the forehead, top, and upper-rear portion of the skull. The frontalis section controls movement of the forehead and eyebrows, thus enabling forehead wrinkling. The occipitalis controls backward movement of the scalp, which raises the eyebrows.
The bellies are connected by a thick fibrous sheath called epicranial aponeurosis (galea aponeurotica) onto which both of them attach. The function of occipitofrontalis muscle is to elevate the eyebrows and wrinkle the forehead skin with its frontal part, and to retract the scalp with its occipital part.
What is occipitofrontalis muscle?
Together with temporoparietalis, it comprises the epicranial group of the muscles of facial expression. Occipitofrontalis consists of frontal and occipital bellies, each containing a pair of quadrangular muscle heads.
What is the function of the eyebrow muscles?
Elevates the eyebrow; contracts and retracts the scalp. The occipitalis muscle function is to move the scalp back. Assisted by the occipital belly, the frontal belly draws the scalp back which raises the eyebrows and wrinkles the forehead. The muscle acts to close the eye, and is the only muscle capable of doing so.