Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Embryo a arch

Arches, pouches, clefts

Anterior extensions of dorsal aortae into head Distal 2/3 of ICA
Aortic sac of truncus arteriosus External carotid arteries
1st aortic arch Regresses at 4 weeks (small portion forms part of maxillary artery)
2nd aortic arch Regresses (except for very small amount which forms stapedius and hyoid arteries)
3rd aortic arch Common carotid arteries and proximal 1/3 of ICA
Left 4th aortic arch Part of arch of aorta, btwn left common carotid and left subclavian aa
Right 4th aortic arch Proximal part of right subclavian
5th aortic arch Transient
Proximal left 6th aortic arch Proximal part left pulmonary artery
Distal left 6th aortic arch Ductus arteriosus
Proximal right 6th aortic arch Proximal right pulmonary artery
Distal right 6th aortic arch Regresses
Left subclavian artery forms from Left 7th intersegmental artery
Right subclavian artery forms from Proximal: right 4th aortic arch Distal: right 7th intersegmental
Aortic sac of truncus arteriosus forms Brachiocephalic artery, proximal arch of aorta
What forms arch of aorta Aortic sac of truncus arteriosus, left 4th aortic arch, left dorsal aorta
1st pharyngeal pouch Tubotympanic recess--forms middle ear and auditory tube
2nd pharyngeal pouch Tonsilar fossa and palatine tonsils
Dorsal 3rd pouch Inferior parathyroid
Ventral 3rd pouch Thymus
Dorsal 4th pouch Superior parathyroid
Ventral 4th pouch Ultimobranchial body
1st pharyngeal cleft External auditory meatus, outer ectodermal eardrum
2nd, 3rd, 4th clefts No derivatives
What happens to clefts 2,3,4 2nd arch grows caudally, overlaps 3,4; fuses with epicardial ridge, forming cervical sinus.
Created by: cooandrew



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards