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General Anatomy 2 Lecture > Temporomandibular joint and Muscles of Mastication > Flashcards

Temporomandibular joint and Muscles of Mastication Flashcards

1
Q
  • one of the most complex joints in our body
  • area where the mandible articulates
    with the temporal bone of the
    cranium
  • only freely movable joint between skull bones
A

Temporomandibular joint

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2
Q

temporomandibular joint is considered as a __________ joint

A

ginglymoarthrodial

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3
Q

temporomandibular joint is the _______ _______ of the mandible and mandibular ______ and _______ ______ of temporal bone

A

condylar process
fossa
articular tubercle

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4
Q

Since the articular surface of the joint is nonvascular, it acts as a medium for providing metabolic requirements to these tissues. it also serves as a lubricant between articular surfaces during friction.

A

Synovial fluid

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5
Q

What are the anatomical components of TMJ?

A
  • Articular disc
  • Articular capsule
  • Lateral ligament
  • Sphenomandibular ligament
  • Stylomandibular ligament
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6
Q

it is a fibrocartilage that separates the synovial cavity: superior and inferior compartment

A

Articular disc

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7
Q

Thin, fairly loose envelope around the circumference of the joint

A

Articular capsule

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8
Q

Known to be 2 short bands in the lateral surface of the articular surface. Extended inferiorly and posteriorly from the inferior border and tubercle of the zygomatic process

A

Lateral Ligament

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9
Q

this band extends inferiorly and anteriorly from the spine of the sphenoid bone to the ramus of the mandible. it does not contribute significantly to the strength of the joint

A

Sphenomandibular ligament

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10
Q

from the styloid process of the temporal bone to the inferior and posterior border of the ramus of the mandible

A

Stylomandibular ligament

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11
Q

What are the movement of the Mandible?

A
  • Hinge
  • Condyloid
  • Sliding/ Arthrodial
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12
Q

It is a movement of the mandible which function in a hinge-like fashion during elevation and depression.

A

Hinge

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13
Q

A movement of the mandible which glides slightly forward when the jaw is in protrusion and retrusion

A

Condyloid

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14
Q

A movement of the mandible which glides side to side during chewing

A

Sliding/ Arthrodial

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15
Q

Movement of each compartment:

Inferior Compartment:
Superior Compartment:

A
  • depression/ elevation
  • protraction/ retraction, lateral displacement, slight rotation
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16
Q

What are the muscles of mastication?

A
  • Masseter
  • Temporalis
  • Lateral Pterygoid
  • Medial Pterygoid
17
Q

Muscles of Mastication:

Blood supply:
Innervated by:

A
  • maxillary artery
  • mandibular nerve (V3 Trigeminal Nerve)
18
Q

What are the functions of Muscles of Mastication?

A
  • to move the mandible
  • to secure then stabilize the mandibular positions
  • to determine the direction of mandibular movements
19
Q

Muscles of Mastication

  • a small quadrilateral muscle that covers most of the lateral aspect of the ramus of the mandible
  • superficial to this muscle is a portion of the parotid gland, parotid duct, facial artery, and the various branches of the facial nerve
A

Masseter

20
Q

Muscles of Mastication

  • an almost a
    mirror-like image of
    the masseter muslce.
  • it is rhomboidal and
    runs practically in the
    same direction on the
    inner surface of the
    mandible.
A

Medial Pterygoid

20
Q

Muscles of Mastication

  • fan-shaped, with the
    periphery of the fan
    attached to the side of
    the skull and the handle
    of the fan attached to
    the coronoid process of
    the mandible
  • covered by a strong
    membranous sheet of
    fascia, which attaches
    superiorly to the
    superior temporal line
  • below, the fascia splits
    to attach to the medial
    and lateral aspects of
    the zygomatic arch.
A

Temporalis

21
Q

Muscles of Mastication

  • almost triangular in
    shape with two distinct
    heads, inferior and
    superior head, each
    with contrasting
    functions
  • only muslces of the four
    muscles of mastication
    to occupy primarily a
    horizontal position.
A

Lateral Pterygoid

22
Q

Muscles of Mastication

  • the occupants of the infratemporal fossa
A

Medial and Lateral Pterygoid

23
Q

Actions of the Muscle
Masseter- superfical head

A
  • elevation
  • Ipsilateral excursion
  • protrusion
24
Q

Actions of the Muscle
Masseter- deep head

A
  • retrussion
25
Q

Actions of the Muscle
temporalis

A
  • elevation
  • ipsilateral excursion
  • retrusion
26
Q

Actions of the Muscle
medial pterygoid

A
  • elevation
  • protrusion
  • contralateral excursion
27
Q

Actions of the Muscle
lateral pterygoid- inferior head

A
  • depression
  • protrussion
  • contralateral excursion
28
Q

Actions of the Muscle

A
  • elevation: particularly during power stroke
29
Q

-

A
  • suprahyoid muscle
  • infrahyoid muscle
30
Q

Muscles involved in the Action of MoM

Depression
1.
2.
3.

A
  1. inferior head of the right and left lateral pterygoid muscles
  2. right ad left suprahyoid muscles of the neck
  3. right and left infrahyoid muscles of the neck
31
Q

Muscles involved in the Action of MoM

Protrusion
1.
2.
3.

A
  1. right and left lateral pterygoid muscles
  2. right and left medial pterygoid
  3. right and left superficial heads of the masseter muscles
32
Q

Muscles involved in the Action of MoM

Retrusion
1.
2.

A
  1. posterior fibers of the right and left temporalis muscles
  2. deep heads of the right and left masseter muscles
33
Q

Muscles involved in the Action of MoM

right lateral excursion
1.
2.
3.
4.

A
  1. right masseter
  2. right temporalis
  3. right medial pterygoid
    4.right lateral pterygoid
34
Q

Muscles involved in the Action of MoM

left lateral excursion
1.
2.
3.
4.

A
  1. left masseter
  2. left temporalis
  3. right medial pterygoid
    .4. right lateral pterygoid

General Anatomy 2 Lecture (2 decks)

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