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Oral Histology > Orofacial Development: Mandible and TMJ > Flashcards

Orofacial Development: Mandible and TMJ Flashcards

1
Q

mandibular process is what part of 1st PA

A

lower part

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2
Q

what does mandibular process differentiate into

A

soft tissue, cartilage and bone

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3
Q

what is a primary cartilage that develops early from hyaline

A

Meckel’s cartilage

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4
Q

what iis the developmental precursor for middle ear bones (malleus/incus) and provides scaffold for mandible to develop around

A

Meckel’s cartilage

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5
Q

secondary cartilages help wiith growth of what

A

mandible

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6
Q

types of secondary growth cartilage

A

condylar, angular, coronoid, and symphyseal

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7
Q

external permanent structures of mandibular process

A
  1. chin
  2. lower lip and commissure (formed by fusion of max and mand process)
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8
Q

internal permanent structures of mandibular processs

A
  1. mandible
  2. condyle of mandible/TMJ
  3. mucosa of anteriior 2/3 tongue
  4. middle ear bones (malleus and incus)
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9
Q

what develops from derivatives of Meckels’ cartilage (2 middle ear bones)

A

Primary (temporary) TMJ joint

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10
Q

what develops from squamous portion of temporal bone and condylar head of mandible (both PA1)

A

secondary (permanent) TMJ joint

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11
Q

___ and ___ appear as two distinct regions of ectomesenchyme of first arch during development

A

temporal bone and condyle

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12
Q

___ is a primary cartilage that extends as rod of hyaline cartilage from ear to midline of mandibular process (not fused in midline)

A

meckels

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13
Q

steps of primary TMJ development

A
  1. Meckel’s cartilage differentiates from ectomesenchyme of mand 1st PA
  2. differentiation of Meckel’s cartilage
  3. posterior region of meckel’s ossifies
  4. formation of temporary (primary) TMJ
  5. malleus and incus become incorporated into middle earcavity
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14
Q

what stage do incus and malleus form

A

stage 3

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15
Q

what stage do malleus and incus artiiculate an dmove

A

stage 4

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16
Q

adult derivative and function of the following Meckel’s cartilage region:

posterior region

A

AD: malleus, incus, anterior ligament of malleuss

function: malleus and incus 1st PA articulate with stapes middle ear bone 2nd PAL
anterior ligament attenuatess movement of malleus

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17
Q

adult derivative and function of the following Meckel’s cartilage region:

middle region

A

AD: sphenomandibular ligament

function: limits inferior displacement of mandible; passive support to TMJ

18
Q

adult derivative and function of the following Meckel’s cartilage region:

anterior regiion

A

AD: degenerates eventually

function: signaling center - stimulates development of symphyseal cartilage (secondary growth cartilage)

19
Q

what contributes to 2 middle ear bones and 2 ligaments

A

meckels

20
Q

does meckels contribute to mandible

A

NOOO

21
Q

secondary/permanent TMJ develops from what

A

PA1st mandibular and PA1st maxillary

22
Q

what structures of TMJ are 1st PA derivatives and received innervation from CN V

A

ALL STRUCTURES

23
Q

___ and ___ develop as secondary growth cartilage

A

condyle and articular eminince

24
Q

the ___ stays as fibrocartilage until 20 yrs and is a significcant source of mandibular growth

A

condyle

25
Q

bone remodeling of adult mandible occurs in response to what

A

mechanical load

26
Q

___ is associated with condylar head and artiicular eminence to facilitate remodeling

A

fiibrocartilage

27
Q

is there hyaline in the TMJ

A

NOOOO

28
Q

what are TMJ arttiicular joint surfaces covered with? why?

A

perichondrium (DRCT) - DRCT allows for repair and strimulates remodeling in response to occlusal loads

29
Q

what type of cartilaginous growth occurs in TMJ

A

apposititonal due to perichondrium

30
Q

articular disc is comprised of what CT

A

fibrous CT (DRCT)

31
Q

what is divided into thick, peripheral anterior and posterior bands

A

articular disc

32
Q

what is thin, avascular, and lacks innervation in articular disc

A

central intermediate zone

33
Q

sensory receptors are found where in regards to disc

A

joint capsule, ligaments, retrodiscal pad, periphery of disc, and lateral pterygoid muscle

34
Q

what type of innervation to capsule to provide feedback about joint poisition and masticatory force

A

proprioceptive innervation

35
Q

what type of innervation in capsule to alert to trauma

A

sensory pain receptors and fibers

36
Q

when does mandible develop LATERAL to meckel’s

A

step 3 - maturation stage

37
Q

how does mandible ossify

A
  1. endochondral (condyle)
  2. intramembranous (body and ramus)
38
Q

primary ossification site of mandibular body begins where

A

bifurcation of inferior alveolar nerve into incisive and metnal branches

39
Q

ossification of body and ramus occurs where compared to the points of initial ossification

A

POSTERIORLY

40
Q

what nerve do we find when given a histo slide of the mandible

A

inferior alveolar nerve

41
Q

what cartilages are transient, forming in association w/ only bones that develop by intramembranous ossificccation

A

secondary growth cartilage

42
Q

what develops after ossification begins and aid in the growth of intramembranosu bones

A

secondary growth cartilage

Oral Histology (12 decks)

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