Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
34 Cards in this Set
- Front
- Back
|
1st PA cleft ectoderm |
external auditory meatus external tympanic membrane |
|
|
1st PA covering ectoderm |
epidermis of face roof of stomodeum enamel organs parotid glands pituitary (anterior lobe) |
|
|
2nd PA ectoderm covering |
epidermis of upper auricle epidermis of upper neck |
|
|
3rd PA ectoderm covering |
epidermis of middle neck |
|
|
6th PA ectoderm covering |
epidermis of lower neck |
|
|
What happens to 4th PA ectoderm covering and cleft? |
obliterates |
|
|
Describe the formation of a lateral cervical cyst. |
2nd arch expands over the 3rd and 4th, leaving a potential space for a cyst or a sinus to develop (LATERAL) Develops along ANTERIOR border of SCM viral infection precludes inflammation |
|
|
Name some potential problems associated with neural crest migration. |
Heart defects Anterior chamber of the eye (Canal of Schlemm) Cleft lip or palate DiGeorge Syndrome Dental abnormalities |
|
|
What arch is associated with Meckel cartilage? |
1st PA |
|
|
What arch is assocated with Reichert cartilage? |
2nd PA |
|
|
What is derived from Meckel cartilage? |
mandible spehnomandibular ligament malleus and incus (superior portions) |
|
|
What is derived from Reinchert cartilage? |
stapes inferior malleus and incus styloid process stylohyoid ligament lesser cornu upper body of hyoid |
|
|
3rd Arch NC |
greater cornu lower body of the hyoid |
|
|
4th and 6th NC |
thyroid cartilage of the larynx |
|
|
Muslces innervated by CN III? |
pre-chordal plate mesoderm |
|
|
Muscles of the 1st Arch? |
muscles of mastication tensors myelohyoid anterior belly of digastric |
|
|
Muscles of the 2nd Arch? |
muscles of facial expression stapedius post belly of digastric stylohyoid |
|
|
Muscles of the 3rd arch? |
stylopharyngeus |
|
|
Muscles of the 4th arch? |
larynx constrictors |
|
|
Muscles of the tongue? Except palatoglossus |
occiptal myotomes of paraxial mesoderm |
|
|
1st PA pouch derivates |
auditory tube middle ear cavity |
|
|
2nd PA pouch derivates |
palantine fossa |
|
|
3rd PA pouch derivates |
Dorsal: inferior parathyroid Ventral: thymus |
|
|
4th PA pouch derivates |
Dorsal: superior parathyroid Ventral: ultimobranchial body |
|
|
How is the final position of the parathyroid formed? |
raustral growth of the brain and caudal growth of the heart and pharynx |
|
|
What day does the thyroid develop? |
24 |
|
|
What layer is the thyroid derived from? |
endoderm |
|
|
From what PA does the thryoid arise? |
2-3 arch |
|
|
Describe the route of the thyroid to its final adult position |
Descends via the thryoglossal duct from the foramen cecum anterior to the hyoid and larynx thyroid cartilage by 7th week |
|
|
Thyroglossal duct cysts and sinuses |
patent thyroglossal duct, usually inflammed following infection MIDLINE STRUCTURE |
|
|
Describe an ectopic thyroid |
thyroid tissue fails to descend, possible to find thyroid tissue at the base of the tongue or along any route of the thyroglossal duct pyramidal lobe of the thyroid |
|
|
Describe first arch syndrome |
Misshaped, small jaw ossicles pituitary palate enamel problems ABNORMAL MIGRATION OF NC |
|
|
DiGeorge Syndrome |
No thymus of parathyroid glands Due to failure of NC cell migration INVOLVES ARCHES 3-4-6 cardiac problems, hypoparathyroidism, anomalies of the mouth, low set notched ear, nasal clefts, thyroid hypoplasia |
|
|
What does the ultimobranchial body give rise to? |
parafollicular cells, cels adjacent to thyroid follicles in calcitonin production |
