ACTIVITY 1

ACTIVITY 1

ACTIVITY 1

by Allyza Joyce Raz -
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  1. Name of muscle: Platysma

  • Origin: It originates from the upper parts of the pectoralis and deltoid fascia. Its fiber runs upwards and medially.

  • Insertion: It inserts into the anterior fibers to the base of mandible, posterior fibers to the skin of the lower face and lip and may be continuous with the risorius.

  • Action: It produces a slight wrinkling of the surface of the skin of the neck in an oblique direction. Its anterior portion, the thickest part of the muscle, depresses the lower jaw; it also serves to draw down the lower lip and angle of the mouth in the expression of melancholy (like surprise or horror). However, the platysma plays only a minor role in depressing the lip which is primarily performed by the depressor anguli oris and the depressor labii inferioris.

 

  1. Name of muscle: Mentalis

  • Origin: The origin of a muscle refers to the location in the body in which the muscle begins. The origin of the mentalis is the incisive fossa of the mandible.

  • Insertion: The insertion point of the mentalis is the skin of the lower lip. Since it attaches to the skin of the lower lip, when this muscle contracts.

  • Action: It elevates the base and protrusion of the lower lip, and wrinkles the skin of the chin. The mentalis muscle works in coordination with the orbicularis oris muscle (for the upper lip) to allow the lips to “pout”. When the mentalis muscle acts, the skin on the chin wrinkles and dimples, leading to facial expressions of skepticism or annoyance.

 

  1. Name of muscle: Orbicularis Oris 

  • Origin: It originates from the superior incisivus from the maxilla, and the inferior incisivus, from the mandible it is the thickest middle stratum, derived from the buccinator, thick superficial stratum, derived from elevators and depressor of lips and their angles.

  • Insertion: It inserts on the lips and angle of the mouth.

  • Action: The orbicularis oris muscle helps in the opening and closing of lips and also helps in puckering of the mouth. Has two (2) purposes: A) deep fiber causes the mouth’s sphincter activity by acting as a constrictor. The “archaic” portion of the muscle is associated with retaining food due to general sphincteric activity as well as other muscular loops of the oropharynx. B) The superficial fiber, also known as the retractor fiber, is involved in speech modulation and precise lip motions.

 

  1. Name of muscle: Corrugator Supercilii 

  • Origin: The depressor supercilii originates on the medial orbital rim, near the lacrimal bone. It arises from the medial end of the superciliary arch; and its fibers pass upward and laterally, between the palpebral and orbital portions of the orbicularis oculi muscle, and are inserted into the deep surface of the skin, above the middle of the orbital arch.

  • Insertion: Inserts on the medial aspect of the bony orbit, inferior to the corrugator supercilii. In some specimens it exhibits two heads and in others, only one.

  • Action: Draws the eyebrow downward and medially, producing the vertical wrinkles of the forehead. It is the “frowning” muscle, and may be regarded as the principal muscle in the expression of suffering. contracts to prevent high sun glare, pulling the eyebrows toward the bridge of the nose, making a roof over the area above the middle corner of the eye and typical forehead furrows.

 

  1. Name of muscle: Orbicularis oculi

  • Origin: The orbicularis oculi originates from the front surface of the orbital margin, which is the rim of the eye socket.

  • Insertion: The lateral palpebral raphe is located on the outer part of each eye socket.

  • Action: It closes lids tightly resulting in a winking, it also protects the eye from bright light. It closes lids gently resulting in blinking.

 

  1. Name of muscle: Occipitofrontalis

  • Origin: Two occipital bellies and two frontal bellies.

  • Insertion: Galea aponeurotic.

  • Action: Raises eyebrows, wrinkled forehead.




References:

Vastralphysiotherapyclinic. (2023, August 3). Occipitofrontalis muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/occipitofrontalis-muscle/ 

 

Vastralphysiotherapyclinic. (2023, October 11). Orbicularis oculi muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/orbicularis-oculi-2/

 

Vastralphysiotherapyclinic. (2023, October 18). Corrugator supercilli muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/corrugatorsuperchilli-muscle-78-2/ 

 

Vastralphysiotherapyclinic. (2023, October 18). Mentalis muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/mentalis-muscle/ 

 

Vastralphysiotherapyclinic. (2023, October 26). Platysma muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/platysma-muscle/ 


Vastralphysiotherapyclinic. (2023, October 8). Orbicularis oris muscle. Mobility Physiotherapy Clinic. https://mobilephysiotherapyclinic.net/orbicularis-oris-muscle/