- frontal process, oral pit, maxillary process, mandibular arch and hyoid arch form (pharyngeal arches) - frontal process of the brain bulge forward - heart begins to pump blood (lies immediately below the face)

- nasal pits develop on the upper border of the lip - frontal process becomes the frontal nasal process - nostrils deepen - face broadens - mandibular arch loses its midline

Chp 4 Flashcards by sarah barker

what weeks does the human face develop

4-7th week

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the palatal process begin to close during what week

8th week

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the face develops from the tissues immediately surrounding what

the oral pit

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what separates the oral and nasal cavity during development

palate

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_____ functions in palatine shelf closure

tongue

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what part of the head develops the forehead

frontal process

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lateral to the oral pit are the ______

left and right check (maxillary process)

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___ arch forms part of the external and middle ear

hyoid

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week 4

frontal process, oral pit, maxillary process, mandibular arch and hyoid arch form (pharyngeal arches)
frontal process of the brain bulge forward
heart begins to pump blood (lies immediately below the face)

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what forms the upper lip

one nasal process and 2 lateral maxillary process

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week 5

nasal pits develop on the upper border of the lip
frontal process becomes the frontal nasal process
nostrils deepen
face broadens
mandibular arch loses its midline

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the period before the ____ week is the critical time which these factors can effect facial development

5th

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when does the palate form

week 7-9

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_____ represents the width of the face

internasal area

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what week does the mandibular lose its midline construction

5th

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6th week

-face broadens
-lateral growth of brain
-eyes and maxillary come to the front of the face
-mouth slit widens
-upper lip now composed of medial nasal process and two lateral maxillary process
_max and mand tisssues merge

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what develops your thyroid gland

foramen cecum on the base of the tongue

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the medial nasal process is called the _____

philtrum

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what weeks does a cleft palate occur

7-9 week

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placodes start to merge at week

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nostrils start to develop at week

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the danger of cleft lip passes in week

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bumps at the back of the tongue

circumvolve papilla

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a lack of contact or fusion of the medial nasal and maxillary processes results in either a unilateral or bilateral _____

cleft lip

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the epithelial coverings of the medial nasal and maxillary process normally contact and create a zone of fusion termed _____ ____

nasal fin

what muscle provides support to the upper lip

orbicularis oris

extending from the nostrils to the eyes is an oblique groove called the ______

oronasal optic groove

what duct forms in the tissue beneath the oronasal optic groove

nasolacrimal duct

what appears in the 6th week below the corners of the mouth

auditory tube

are grouped around the external ear canal during week 6

six small auricular hillocks of tissue

what arch do the auricular hillock come from

mandibular arch and hyoid arch

week 7

- more human appearance - eyes and nose move centrally - lateral growth of brain - upper lip has fused (causes Philtrum) - ear hillocks fused and grown to form ears (auricles) - danger of cleft lip has passed

name what forms the roof of the mouth

two lateral palatine processes | and medial processes (primary palate)

the lateral palatine process and primary palate form what

roof of the mouth

during what week does the posterior shelf push together forcing the tongue forward and down, causing the palatal shelves to slide over the tongue.- Palatal Shelf Elevation

week 8

tongue originates from the MUSCLES of the ______ ________

occipital myotomes

The innervation of the tongue is the result of the _________

muscle cells migrating from each pharyngeal arch. Muscle travel paths of various nerves

nerves that innervate the tongue

5, 7, 9, 10, 12

what arches (tissue) forms the anterior (movable) body of the tongue

1st pharyngeal arch

what arches form the posterior immovable base of the tongue

2nd and 3rd pharyngeal arch

what three tissues make up the tongue

1- central tuberculum impar | 2- lateral lingual swelings

the surface body and base of the tongue are separated by what?

terminal sulcus (v-shaped groove)

what is posterior to the base of the tongue is the

lingual tonsils

what are the ring of tonsils (lingual, palatine and pharyngeal) called

waldeyer tonsillar ring

what develops from the foramen cecum on the surface of the tongue

the thyroid gland

what holds the thyroid gland and tongue together during formation

thyroglossal duct

______ is a blind pocket lined with thyroid epithelium

thyroglossal cyst

_____ appears as swelling that has an opening on the surface of the neck

thyroglossal fist

when does the thyroid gland become functional

third month prenatal

what can cause facial and palatial clefts

environment and genetics

most common facial malformation

cleft lip

Cleft that does not involve an opening of the nostril into oral cavity

lip

_____ is a midline cleft of the maxilla

harelip

a cleft of the mandible is usually caused because of

pressure from the heart beating during formation

What are the four embryonic processes does the face arise from?

Frontal process, maxillary process, frontonasal process, and lateral and medial nasal processes

When do palatine shelves elevate and begin closure?

8th week

When does the upper lip begin to coalesce into one unit?

6th week

From what structure does the nasal fin arise, and why is its disappearance important?

* medial nasal and maxillary processes | * the lip fuses upon its disappearance

The frontal area becomes known as the frontonasal process during what week

5th week

The medial nasal and maxillary process fuse as connective tissue grows through the floor of the nasal pit. This zone of fusion is called _____

nasal fin

Lack of fusion of the medial nasal and maxillary processes results

in either a unilateral or bilateral cleft lip.

The ear canal or auditory tube come from what?

pharyngeal groove

what week has danger passed for cleft lip?

7th

As the palatine shelves grow medially, they

contact the tongue and grow downward on either side of the tongue.

week 8

- posterior shelves push together, forcing the tongue forward and down and allowing the shelves to slide over the tongue. - known as palatal shelf elevation.

The palatine shelf closure or fusion is the final growth surge in which the shelves make contact in the midline. During what weeks

7 to 9

The tongue originates from the muscles of the

occipital myotomes.

In the white, african and asian population, the incidence of cleft lip is

1 in every 700 births. 1 in every 2000 3 in every 2000 births;

cleft lip/palate in white boys vs girls

White boys have nearly twice the number of cleft lips or a combination of cleft lips and palate as girls; however, white girls have a higher incidence of cleft palates.

Chp 4 Flashcards

(69 cards)