Anatomy of the Epicranial Aponeurosis
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Questions and Answers

What muscle raises the angle of the mouth in smiling and contributes to the depth and contour of the nasolabial furrow?

  • Orbicularis Oris
  • Risorius (correct)
  • Depressor Labii Inferioris
  • Platysma
  • Which muscle pulls the corner of the mouth laterally in numerous facial activities, including grinning and laughing?

  • Risorius
  • Platysma
  • Depressor Labii Inferioris (correct)
  • Orbicularis Oris
  • Which muscle draws the lower lip downwards and a little laterally in masticatory activity?

  • Orbicularis Oris
  • Risorius
  • Depressor Labii Inferioris (correct)
  • Platysma
  • Which muscle contributes to the expressions of irony, sorrow, melancholy, and doubt?

    <p>Depressor Labii Inferioris</p> Signup and view all the answers

    What is the vascular supply to the Depressor Labii Inferioris muscle?

    <p>Maxillary artery</p> Signup and view all the answers

    Which nerve supplies the Risorius muscle?

    <p>Facial nerve</p> Signup and view all the answers

    Where does the palpebral part of the orbicularis oculi muscle arise from?

    <p>Medial palpebral ligament, mainly from its superficial surface</p> Signup and view all the answers

    Which arteries supply the orbicularis oculi muscle?

    <p>Facial, superficial temporal, maxillary, and ophthalmic arteries</p> Signup and view all the answers

    Where is the lacrimal part of the orbicularis oculi muscle located?

    <p>Around the lacrimal sac</p> Signup and view all the answers

    What role does the sphincter muscle of the eyelids (lacrimal part) play in?

    <p>Various ocular reflexes</p> Signup and view all the answers

    Which nerve supplies the orbicularis oculi muscle?

    <p>Facial and trigeminal nerves</p> Signup and view all the answers

    What is the usual activation control for the orbital portion of the orbicularis oculi muscle?

    <p>Under voluntary control</p> Signup and view all the answers

    Which muscle surrounds the circumference of the orbit?

    <p>Orbicularis oculi</p> Signup and view all the answers

    What does the temporoparietalis muscle lie between?

    <p>Frontal parts of occipitofrontalis and anterior and superior auricular muscles</p> Signup and view all the answers

    Where do the upper orbital fibers of orbicularis oculi blend with?

    <p>Frontal part of occipitofrontalis</p> Signup and view all the answers

    To what is the aponeurosis attached laterally?

    <p>Zygomatic arch</p> Signup and view all the answers

    Which muscle is inserted into the skin and subcutaneous tissue of the eyebrow?

    <p>Orbicularis oculi</p> Signup and view all the answers

    What allows the aponeurosis to move freely over the scalp?

    <p>Loose connection to the underlying pericranium</p> Signup and view all the answers

    Where does Depressor Anguli Oris converge at the angle of the mouth?

    <p>Orbicularis Oris</p> Signup and view all the answers

    Which muscle is continuous below with Depressor Anguli Oris?

    <p>Platysma</p> Signup and view all the answers

    What is the vascular supply of Depressor Anguli Oris?

    <p>Inferior labial branch of the facial artery</p> Signup and view all the answers

    Which muscle consists of fibers that completely encircle the mouth?

    <p>Orbicularis Oris</p> Signup and view all the answers

    Where is Pars marginalis located within Orbicularis Oris?

    <p>On the labial side of the modiolus</p> Signup and view all the answers

    Which muscle may cross the midline to interlace with its contralateral fellows, forming the 'mental sling'?

    <p>Depressor Anguli Oris</p> Signup and view all the answers

    What is the main function of the Mentalis muscle?

    <p>Raising the lower lip and helping in protruding it</p> Signup and view all the answers

    Which facial muscle is responsible for drawing the angle of the mouth downwards and laterally?

    <p>Compound Sphincter</p> Signup and view all the answers

    How is the mentolabial sulcus affected during the opening of the mouth?

    <p>Becomes more horizontal and its central part deepens</p> Signup and view all the answers

    What is unique about the development of the Action buccal and mandibular branches of the facial nerve in human lips?

    <p>They are closely associated with speech and production of musical tones</p> Signup and view all the answers

    How many segments does the orbicularis oris muscle consist of?

    <p>Eight segments</p> Signup and view all the answers

    Where do some fibers of the orbicularis oris muscle originate from?

    <p>From the cheek and other muscles acting on the lips</p> Signup and view all the answers

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