ACTIVITY 1

Dayrit, Yzabelle P. (Activity 1)

Dayrit, Yzabelle P. (Activity 1)

by Yzabelle Dayrit -
Number of replies: 0

 

1. Platysma

  • Origin: fascia covering the clavicle, the acromial region, and superior portions of the pectoralis major and deltoid muscles (skin over lower neck and upper lateral chest)

  • Insertion: Lower border of mandible or the skin of the lower lip

  • Action: (1) depresses the mandible, (2) tenses the skin of inferior face

2. Mentalis

  • Origin: Incisive fossa of mandible 

  • Insertion: skin of the chin 

  • Action: (1) provides stability to lower lip, allowing for pouting, (2) wrinkles skin of chin (3) elevates and protrudes lower lip

3. Orbicularis oris

  • Origin: medial maxilla and mandible; angle of mouth (modiolus)

  • Insertion: Mucous membrane of lips 

  • Action: (1) Constriction - sphincteric action of mouth, (2) Retraction - facial expressions and precise movement of lips as needed in speech

 

4. Corrugator supercilii

  • Origin: medial part of superciliary arch on frontal bone

  • Insertion: skin above middle part of eyebrows

  • Action: (1) Pulls skin of eyebrows downward and medially, (2) Wrinkles part of forehead

5. Orbicularis oculi

  • Origin: nasal part of frontal bone, frontal process of maxilla, medial palpebral ligament, lacrimal bone

  • Insertion: Skin of orbital region, lateral palpebral raphe, superior and inferior tarsal plates

  • Action: (1) Orbital part: closes eyelids tightly, (2) Palpebral part: closes eyelids gently, (3) Deep palpebral part: compresses lacrimal sac, and (4) Aid passage and drainage of tears

6. Occipitofrontalis

  • Origin: skin of eyebrow, muscles of forehead, lateral ⅔ of superior nuchal line

  • Insertion: Epicranial aponeurosis

  • Action: (1) Elevate eyebrows, wrinkle skin of forehead, (2) Retracts scalp

 

References