Development of the Face Flashcards

1
Q

<p>When does face development first begin?</p>

A

<p>early 4th week</p>

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2
Q

<p>what happens in the early 4th week?</p>

A

<p>the face is derived from 5 facial prominences surrounding the stomodeum.</p>

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3
Q

<p>what is the stomodeum?</p>

A

<p>the primitive mouth</p>

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4
Q

<p>what are the facial prominences made up of?</p>

A

<p>neural crest cells</p>

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5
Q

<p>what are the 5 facial prominences?</p>

A

<p>1 frontonasal prominence
2 maxillary prominences
2 mandibular prominences</p>

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6
Q

<p>where is the frontonasal prominence?</p>

A

<p>cranial to stomodeum</p>

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7
Q

<p>where are the maxillary prominences?</p>

A

<p>lateral to the stomodeum</p>

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8
Q

<p>where are the mandibular prominences?</p>

A

<p>caudal to stomodeum</p>

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9
Q

<p>what do nasal placeodes develop from and when does this happen?</p>

A

<p>the ectodermal thickenings on the ventrolateral parts of the frontonasal prominence
occurs in late 4th week</p>

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10
Q

<p>what merges across the midline in the late 4th week?</p>

A

<p>mandibular prominences</p>

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11
Q

<p>why do the nasal placodes become depressed and when does this happen?</p>

A

<p>become depressed as mesenchyme surrounding nasal placodes proliferates to form horseshoe shaped elevations
occurs in the 5th week</p>

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12
Q

<p>what do the horseshoe shaped elevations of mesenchyme surrounding the nasal placodes consist of?</p>

A

<p>2 medial nasal prominences

| 2 lateral nasal prominences</p>

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13
Q

<p>when do the primitive nostrils and nasal cavities develop?</p>

A

<p>5th week</p>

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14
Q

<p>what are the primitive nostrils and nasal cavities?</p>

A

<p>in the 5th week nasal placodes invaginate becoming paired nasal pits following the development of the of medial and later nasal prominences</p>

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15
Q

<p>When the maxillary prominences grow medially what does it cause and when does this occur?</p>

A

<p>it presses the medial nasal prominences to move toward the midline
occurs in 7-10 weeks</p>

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16
Q

<p>the fusion of the medial nasal prominences forms what and when does this occur?</p>

A

<p>intermaxillary segment

| occurs in 7-10 weeks</p>

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17
Q

<p>what does the intermaxillary segment become and when does this occur?</p>

A

<p>philtrum
primary palate
medial maxilla
occurs in 7-10 weeks</p>

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18
Q

<p>what forms the secondary palate and when does this occur?</p>

A

<p>merging of the maxillary prominences

| occurs in 7-10 weeks</p>

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19
Q

<p>what allows for the formation of the upper lip?</p>

A

<p>fusion between medial nasal prominences and the maxillary prominences</p>

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20
Q

<p>what causes cleft lip and/or palate?</p>

A

<p>failure of the prominences to fuse</p>

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21
Q

<p>what do the lateral nasal prominences merge and fuse with?</p>

A

<p>the maxillary prominences</p>

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22
Q

<p>when do the structures of the face develop their characteristic form?</p>

A

<p>early fetal development</p>

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23
Q

<p>what causes the eyes to shift medially, resulting in their forward-looking orientation</p>

A

<p>enlargement of the brain</p>

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24
Q

<p>elongation of the mandible causes what?</p>

A

<p>the ear to appear to rise</p>

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25
Q

<p>what migrate to develop the mm. of facial expression?</p>

A

<p>myoblasts from the second pharyngeal arch</p>

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26
Q

<p>when is the face fully developed?</p>

A

<p>the 14th week</p>

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27
Q

<p>facial defects of fetal alcohol syndrome will only occur if the mom drinks when?</p>

A

<p>during the 1st trimester</p>

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28
Q

<p>levator</p>

A

<p>elevate</p>

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29
Q

<p>depressor</p>

A

<p>move it down</p>

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30
Q

<p>labii</p>

A

<p>associated with lip</p>

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31
Q

<p>anguli</p>

A

<p>angle of mouth (smile, frown)</p>

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32
Q

<p>superioris</p>

A

<p>upper lip</p>

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33
Q

<p>inferioris</p>

A

<p>lower lip</p>

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34
Q

<p>obicularis</p>

A

<p>sphincter mm. (close eyes, close mouth)</p>

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35
Q

<p>oculi</p>

A

<p>eyes</p>

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36
Q

<p>oris</p>

A

<p>upper/lower lip</p>

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37
Q

<p>what are the mm. of the eye?</p>

A

<p>frontalis, orbicularis oculi, corrugator supercilii mm.</p>

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38
Q

<p>what does frontalis m. do?</p>

A

<p>raise eyebrow, wrinkle forehead</p>

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39
Q

<p>what does orbicularis oculi m. do?</p>

A

<p>close eyelids (sphincter)</p>

40
Q

<p>what does corrugator supercilii m. do?</p>

A

<p>draw eyebrow inferior and medially</p>

41
Q

<p>what are the mm. of the nose?</p>

A

<p>procerus, nasalis, depressor septi mm.</p>

42
Q

<p>what does procerus m. do?</p>

A

<p>wrinkle skin over bridge of nose</p>

43
Q

<p>what does nasalis m. do?</p>

A

<p>dilate nostrils</p>

44
Q

<p>what does depressor septi m. do?</p>

A

<p>draw septum inferiorly</p>

45
Q

<p>what are the mm. of the mouth?</p>

A

<p>orbicularis oris, levator labii superioris (+alaeque nasi), zygomaticus major/minor, levator anguli oris, risorius, buccinator, depressor anguli oris, depressor labii inferioris, mentalis mm.</p>

46
Q

<p>what does orbicularis oris m. do?</p>

A

<p>close lips, shop lips during speech</p>

47
Q

<p>what does levator labii superioris (+alaeque nasi) m. do?</p>

A

<p>elevate upper lip and angle of mouth</p>

48
Q

<p>what does zygomaticus major/minor m. do?</p>

A

<p>elevate angle of mouth</p>

49
Q

<p>what does levator anguli oris m. do?</p>

A

<p>elevate angle of mouth</p>

50
Q

<p>what does risorius m. do?</p>

A

<p>retract angle of mouth</p>

51
Q

<p>what does buccinator m. do?</p>

A

<p>compress cheeks</p>

52
Q

<p>what does depressor anguli oris m. do?</p>

A

<p>depress angle of mouth</p>

53
Q

<p>what does depressor labii inferioris m. do?</p>

A

<p>depress lower lip</p>

54
Q

<p>what does mentalis m. do?</p>

A

<p>protrude lower lip?</p>

55
Q

<p>what are the mm. of the ear?</p>

A

<p>anterior, superior, and posterior auricular mm.</p>

56
Q

<p>what do the anterior, superior, and posterior auricular mm. do?</p>

A

<p>retract or elevate ear</p>

57
Q

<p>what is the mm. of the neck?</p>

A

<p>platysma</p>

58
Q

<p>what do the platysma m. do?</p>

A

<p>tense skin of neck</p>

59
Q

<p>what is the n. that provides motor innervation to all mm. of facial expression?</p>

A

<p>facial n. (VII)</p>

60
Q

<p>what foramen does the facial n. (VII) exit?</p>

A

<p>stylomastoid foramen</p>

61
Q

<p>what happens when the facial n. (VII) exits the stylomastoid foramen?</p>

A

<p>it rapidly gives off a few motor br.</p>

62
Q

<p>as the facial n. (VII) proceeds anteriorly what does it pass through and what is this significance?</p>

A

<p>the parotid gland where it divides into 5 br.</p>

63
Q

<p>what are the 5 br. of the facial n. (VII)</p>

A
<p>Ten Zebras Bit My Cat
Temporal
Zygomatic
Buccal
Mandibular
Cervical</p>
64
Q

<p>sensory innervation to the face is provided by what?</p>

A

<p>trigeminal n. (V)</p>

65
Q

<p>What is the exception to the trigeminal n. (V) providing sensory innervation to the face?</p>

A

<p>great auricular n. (C2, C3)</p>

66
Q

<p>what are the divisions of the trigeminal n. (V)?</p>

A

<p>Ophthalmic division (V^1)
Maxillary division (V^2)
Mandibular (V^3)</p>

67
Q

<p>what are the 5 nn. in the ophthalmic division (V^1) of the trigeminal n.?</p>

A

<p>lacrimal n. - lateral upper eyelid
supraorbital n. - middle upper eyelid and anterolateral forehead
supratrochlear n. - medial upper eyelid and anteromedial forehead
infratrochlear n. - medial canthus, lacrimal sac
external nasal n. - nose (including the tip)</p>

68
Q

<p>what are the 3 nn. in the maxillary division (V^2) of the trigeminal n.?</p>

A

<p>zygomaticotemporal n. - anterior part of the temporal fosa
zygomaticofacial n. - prominence of cheek
infraorbital n. - upper lip</p>

69
Q

<p>what are the 3 nn. of the mandibular division (V^3) of the trigeminal n.?</p>

A

<p>auriculotemporal n. - skin anterior to ear
(long) buccal n. (SENSORY) - skin and oral mucosa of cheek (NOT the same as the buccal branch of the facial n. (VII))
mental n. - chin and lower lip</p>

70
Q

<p>V^3 has a motor component that supplies what?</p>

A

<p>the mm. of mastication. these are NOT considered part of the mm. of facial expression</p>

71
Q

<p>What are the arteries that supply the face?</p>

A

<p>facial a.
transverse facial a.
supraoribital a.
supratrochlear a.</p>

72
Q

<p>what is the facial a. a branch off of?</p>

A

<p>external carotid a.</p>

73
Q

<p>what is the transverse facial a. a branch off of?</p>

A

<p>superficial temporal a.</p>

74
Q

<p>what is the supraorbital a. a branch off of?</p>

A

<p>ophthalmic a.</p>

75
Q

<p>what is the supratrochlear a. a branch off of?</p>

A

<p>ophthalmic a.</p>

76
Q

<p>what a. is the major supply to the face?</p>

A

<p>facial a.</p>

77
Q

<p>what are the branches of the facial a. and what do they supply?</p>

A

<p>submental a. - chin
inferior labial a. - inferior lip
superior labial a. - superior lip
lateral nasal a. - ala (side) and dorsum of the nose
angular a. - superior part of the cheek and inferior eyelid</p>

78
Q

<p>what does the transverse facial a. supply?</p>

A

<p>parotid gland and duct</p>

79
Q

<p>what do the supraorbital and supratrochlear aa. supply?</p>

A

<p>upper eyelid, forehead, and scalp</p>

80
Q

<p>What are the vv. that drain the face?</p>

A

<p>angular v.
facial v.
retromandibular v.</p>

81
Q

<p>what does the angular v. drain?</p>

A

<p>supraorbital and supratrochlear vv.</p>

82
Q

<p>what does the angular vv. communicate with and how?</p>

A

<p>communicates with the cavernous sinus via superior and inferior ophthalmic vv.</p>

83
Q

<p>the communication of the angular vv. and the cavernous sinus can result in what and why?</p>

A

<p>because there are no valves restricting flow back to the cavernous sinus, this represents a potential route of infection from the face to dural sinuses ---> CNS infection</p>

84
Q

<p>what is known as the danger triangle of the face?</p>

A

<p>communication of the angular vv. and cavernous sinus via the superior and inferior ophthalmic vv. due to a potential route of infection from face to dural sinuses---> CNS infection</p>

85
Q

<p>what is the facial v.?</p>

A

<p>continuation of the angular v. (angular v. drains into the facial v.)</p>

86
Q

<p>what does the facial v. drain to?</p>

A

<p>the internal jugular v.</p>

87
Q

<p>what does the facial drain communicate with?</p>

A

<p>retromandibular v.</p>

88
Q

<p>where is the retromandibular v.?</p>

A

<p>posterior to the mandible</p>

89
Q

<p>what does the retromandibular v. drain?</p>

A

<p>maxillary v. and superficial temporal v.</p>

90
Q

<p>what does the retromandibular v. join and what does it form?</p>

A

<p>joins with the posterior auricular v. and forms the external jugular v.</p>

91
Q

what is bell palsy?

A

injury of the facial n. (VII) causes paralysis of mm. of facial expression to affected side of the face

92
Q

what is the duration of bell palsy?

A

can be transient (compression from swelling of a viral infection) or permanent (lesion of n.)

93
Q

what trigeminal neuralgia?

A

sharp, sudden attacks of pain in the distribution of a trigeminal n. (V) br.

94
Q

what division of the trigeminal n. (V) is most frequently involved in trigeminal neuralgia?

A

maxillary division (V^2)

95
Q

what could trigeminal neuralgia be caused by?

A

a. compressing the n.