skull Muscles of Mastication: Flashcards

1
Q

Temporalis

A
  • origin: Coronoid process of the mandible
  • i: Temporal fossa
  • action:
    סיבים קדמיים אנכיים- elavation
    סיבים אחוריים אחוריים- Retrusion
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2
Q

Masseter

A
  • origin- zygoma
  • nsertion- External mandibular angle
  • F- elevation
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3
Q

Medial pterygoid-

A
  • origin- Medial part of lateral pterygoid plate
  • insertion- Internal mandibular angle
  • action- elevation, helping in Protrusion
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4
Q

Lateral pterygoid

A
  • isertion: Head and neck of mandibula
  • origin: Lateral part of lateral pterygoid plate
  • f: Protrusion
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5
Q

Mylohyoid

A
  • origin- Mylohyoid line
  • Insertion-Mylohyoid raphe
    and body of hyoid
  • inn-
    עצב קרניאלי V -Trigeminus -
    branches of the Mandibular branch V3
  • action-
    Elevates hyoid, fl oor of mouth,
    and tongue during swallowing and
    speaking
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6
Q

Geniohyoid-

A
  • O-Inferior mental spine of mandible
  • I- body Hyoid
  • C1 via hypoglossal nerve (CN XII)
  • F-
    • fixed hyoid: depression the mandible and retraction
    • fixed mandible- elevate hyoid bone
      Pulls hyoid anterosuperiorly; shortens
      fl oor of mouth; widens pharynx
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7
Q

stylohyoid

A
  • origin: Styloid process of temporal bone
  • insertion: Body of hyoid
  • innervation: Stylohyoid (preparotid) branch of
    facial nerve (CN VII)
  • action: Elevates and retracts hyoid, thus
    elongating fl oor of mouth
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8
Q

Digastric

A
  • origin:
    • `Posterior belly:
      mastoid process
    • Anterior belly:
      Internal mental protuberanc
  • insertion:
    Intermediate tendon
    to body and greater
    horn of hyoid
  • function:
    Working with infrahyoid muscles,
    depresses mandible against
    resistance;
    elevates and steadies hyoid during swallowing and speaking

innervation:
* 4.בטן אחורית – עצב קרניאלי
VII Facialis.

  • בטן קדמית – עצב קרניאלי
    V Trigeminus –
    branches of the Mandibular branch V3
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9
Q

הנעת הלסת התחתונה קדימה יכולה להעשות בשילוב של שני השרירים:

A

Synergists – Masseter & Medial pterygoid

זאת מכיוון שיש להם את אותו כיוון וקטור

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10
Q

הנעת הלסת אחורה יכולה להעשות כסינרגיסט

A

Synergist – Digastric

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11
Q

הנעת הלסת מצד לצד

A

תנועה משולבת של השרירים הקיימים: החיצוניים

ipsilateral-

Temporalis
Masseter

יעבדו בסינרגיה עם הפנימיים

Medial Pterygoid
Lateral Pterygoid

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