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Anatomy > Embryology Review > Flashcards

Embryology Review Flashcards

1
Q

Which of the pharyngeal arch regresses?

A

5th Arch

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2
Q

What tissue are clefts related to?

A

Ectoderm

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3
Q

What tissue are pouches related to?

A

Endoderm

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4
Q

What tissue are arches related to?

A

Mesoderm

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5
Q

What are the muscles and nerves of the 1st pharyngeal arch?

A

CN V

Muscles of Mastication

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6
Q

What are the muscles and nerves of the 2nd pharyngeal arch?

A

CN VII

Muscles of Facial Expression

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7
Q

What are the muscles and nerves of the 3rd pharyngeal arch?

A

CN IX

Stylopharyngeus

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8
Q

What are the muscles and nerves of the 4th pharyngeal arch?

A

CN X - External Laryngeal

Cricothyroid

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9
Q

What are the muscles and nerves of the 6th pharyngeal arch?

A

CN X - Recurrent Laryngeal

Intrinsic Muscles of Larynx

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10
Q

What structures come from the 1st pouch?

A

Tympanic Membrane

“Ears”

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11
Q

What structures come from the 2nd pouch?

A

Palatine Tonsils

“Tonsils”

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12
Q

What structures come from the 3rd pouch?

A

Inferior Parathyroid

“Bottom To”

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13
Q

What structures come from the 4th pouch?

A

Superior Parathyroid

“Top”

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14
Q

Where are branchial cysts found?

A

At the anterior border of the sternocleidomastoid

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15
Q

Where are thyroglossal cysts found?

A

It draws down the thyroid gland and its at the midline of the neck

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16
Q

What aortic arches are regressed?

A

1st, 2nd and 5th

17
Q

What does the 3rd aortic arch become?

A

Common Carotid

18
Q

What does the right 4th arch become?

A

Right Subclavian

19
Q

What does the left 4th arch become?

A

Arch of the Aorta

20
Q

What does the right 6th arch become?

A

Right Pulmonary

21
Q

What does the left 6th arch become?

A

Left Pulmonary and Ductus Arteriosus

22
Q

What is the fate of the ventral mesentery?

A

It becomes the lesser omentum and the falciform ligament

23
Q

What is the fate of the dorsal mesentery?

A

It becomes the greater omentum

24
Q

Where does the stomach rotate and why?

A

Space cannot accommodate the rapidly growing organs and as a result, they must rotate 90 degrees to the right

25
Q

Describe the rotation of the midgut.

A

It rotates around 270 degrees around the SMA counter clockwise and undergoes a physiological hernia because there is not enough room in the abdomen.

26
Q

All of the bladder comes from the endoderm except for what?

A

Trigone. It is mesodermic in origin. It is derived from the caudal end of mesonephric ducts, which is of mesodermal origin.

27
Q

How many kidneys does the embryo start with?

A

3

28
Q

What are the parts of the UG sinus and what do they form?

A

Vesicular - forms bladder

Pelvic - forms urethra

Anatomy (41 decks)

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