Question

multiple select question

select all that apply

which are skeletal attachments of the platysma?

zygomatic arch; fascia near ear
mandible; skin and subcutaneous tissue of lower face
fascia of deltoid and pectoralis major
modiolus of mouth

Explanation:

Identify the platysma muscle

Using the Facial Expression Muscles knowledge point, the platysma is a broad, superficial sheet of muscle located in the anterolateral aspect of the neck. It belongs to the superficial musculoaponeurotic system of the face and neck.

Determine muscle attachments

Using the Muscle Attachment knowledge point, we analyze the superior and inferior connections of the platysma:

• Inferior attachment (origin): It arises from the fascia covering the upper parts of the pectoralis major and deltoid muscles.
• Superior attachment (insertion): It inserts into the lower border of the mandible, and the skin and subcutaneous tissue of the lower face (including the modiolus of the mouth).

Evaluate the given options

• Zygomatic arch; fascia near ear: Incorrect. These are attachments for muscles like the masseter or temporoparietalis, not the platysma.
• Mandible; skin and subcutaneous tissue of lower face: Correct. This represents the superior attachment of the platysma.
• Fascia of deltoid and pectoralis major: Correct. This represents the inferior attachment of the platysma.
• Modiolus of mouth: Correct. The platysma fibers blend with other facial muscles at the modiolus to help depress the lower lip and angle of the mouth.

Answer:

• Zygomatic arch; fascia near ear
• Mandible; skin and subcutaneous tissue of lower face (Correct answer)
• Fascia of deltoid and pectoralis major (Correct answer)
• Modiolus of mouth (Correct answer)