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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Branchial apparatus
consists of = 4ct |
arches
pouches grooves membranes These embryonic structures contribute to the formation of the |
head and neck.
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Pharyngeal arches are
x___________ outpouchings |
mesodermal
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Pharyngeal/Branchial arches are
visible by week __ = |
4
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pharyngeal arches are separated by deep x___________ clefts called
____________ ___________ ________ |
ectodermal
pharyngeal clefts (grooves). |
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The x_________ of the pharynx
, which lines the internal surface of pharyngeal arches, passes into evaginations called ______ _______ |
endoderm
pharyngeal pouches |
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A typical pharyngeal arch/Branchial arch contains =
4ct |
-artery
-cartilaginous -muscular component -cranial nerve + |
An aortic arch (artery)
A cartilaginous rod that forms the skeleton of the arch A muscular component that differentiates into muscles in the head and neck A definite cranial nerve that supplies the mucosa and muscles derived from the arch |
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pharyngeal arches
( __ -pair) begin to develop early in the __ week as neural crest cells migrate into the future head and neck regions. |
6pr
4th |
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By the end of the __ week, four pairs of pharyngeal arches are visible externally.
The fifth and sixth arches are |
4th
rudimentary and are not visible on the surface of the embryo. |
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The 1st pair of pharyngeal arches appears as
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surface elevations lateral to the developing pharynx
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first pharyngeal arch
develops two prominences |
maxillary prominence
mandibular prominence |
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maxillary prominence forms =
3ct |
-maxilla
-zygomatic -squamous part of the temporal bone mandibular prominence forms the = |
mandible (lower jaw)
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the first pair of pharyngeal arches plays a major role in =
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facial development
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second pharyngeal arch
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hyoid arch
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___ ? week, the second pharyngeal arch enlarges and overgrows
*** |
During the 5th week
the third and fourth arches forming an ectodermal depression - the _______ _______ |
cervical sinus.
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By the end of the __ or __ week, the second to fourth pharyngeal grooves and the cervical sinus have disappeared, giving the =
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6th or 7th wk
neck a smooth contour. |
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1st Pharyngeal arch gives rise to
2nd arch gives rise to MYO/Skeletal/Nerve/Artery |
.
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3rd arch
4th arch 6th arch MYO/Skeletal/Nerve/Artery |
.
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***
When the branchial arches form during week 4 and 5, they are penetrated by |
-arteries arising from the aortic sac,
which are called the -aortic arches. |
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1st aortic arch
2nd aortic arch 3rd aortic arch 4th aortic arch 6th aortic arch |
1maxillary
2 stapedial arteries / ext carotids 3 internal carotids 4 (R): proximal part of the right subclavian artery. (L): part of arch of the aorta just proximal to the left subclavian artery 6 (R): proximal part of right pulmonary artery . (L= ductus): proximal left pulmonary artery and ligamentum arteriosum . Ductus arteriosus: ligamentum arteriosum Dorsal aorta (R and L): part of right subclavian, descending aorta below left subclavian |
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►►Fate of pharyngeal arches
*** 1st & 2nd arches |
1st
Maxill Mandib = Face 2nd Hyoid = Neck |
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Cranial N supplying the PH-Arches are =
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5
7 9 10 = |
Trigeminal
Facial glossopharengeal Vagus |
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Cranial Nerve Names =
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OLFACTORY
OPTIC OCCULO TROCHLEAR TRIGEMINAL ABDUCENS FACIAL VESTIBULOCOCHLEAR GLOSSOPHAR VAGUS AXILLARY HYPOGLOSSAL |
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