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

Ward- dev of skull

Viscerocranium Facial Bones. Develope from mesechyme that migrates to pharyngeal arches under the direction of the Neural Crest cells
Neurocranium Skull bones. Developes from mesenchyme derived from sclerotome of somites.
Skull base Cartilage growth plate at the base of the skull causes skull elongation.
Four embryonic bones of the base of the skull 1.Basioccipital. 2.Basisphenoid. 3.Preshnoid. 4.Mesethmoid. **All formed by endochondral ossification of the mesenchyme from sclerotome of somites
Endochondral ossifications contribution to chnage in facial appearance as we age. It takes place over time, elongation at the epiphyseal growth plates. Causes the Jaw to elongate inferiorly and the face to grow larger.
Neotony and Achondroplasia Neotony is the retention of child-like features. Since the facial bones and cranial base rely on endochondrial ossification to grow, the face will remain smaller in protion to the head and will resemble that of a child. (due to early growth plate closure)
Intramembranous Ossification Direct ossification of embryological tissue. Forms spongy trabecular bone (highly vascular) sandwiched b/w two Lamellar bones and is one reason the skull is so much larger than the face in infants.
Sphenobasilar Synchondrosis Cartilagenous junction of posterior surface of sphenoid bone and the basil portion of occipital bone. Compression may result in impaired cranial rhythmic impulses. Manipulation may aid in CSF movement.
Bones formed from Intramembranous ossification those forming from somatic mesoderm as paired bones of the skull: 1.Frontal. 2.Parietal. 3.Posterior occipital. 4.Parietal region of temporal
Calvarium bone growth Grow through intramembranous ossification from a center of ossification outwards until they hit eachother.
Suture formation Once the fronts of the two bones in contact overlap, signals from the dura below stabilize the sutures while other signals thicken the cranial bones. Suture then communicates to the dura underneath to stop osteogenic signals.
Areas of bone growth and resorption Bone growth occurs in areas of high tension on the periosteum. Bone resorption occurs in areas of high compression of the periostium. **Allows the skull to expand while the cortex grows. Inside it resorpbed while the outside expands.
Affect of Aging on sutures Sutures remained packed with CT throughout life allowing flex. However, they can ossify in old age.
What happens if there is a lack of signals from the dura or sutures during suture formation? The sutures will fuse too early
Sutures in neonate/child Coronal, sagittal, lambdoid, squamous, and metopic.
Fontanels in neonate/child Anterior, Posterior, Anteriolateral (sphenoidal), Posterolateral (mastoid)
Premature closure of sutures results in? Head growing abnormally parallel to the affeted suture.
What happens to the Metopic suture? in 85% of adults, it fuses, creating one singal frontal bone.
Trigonocephaly Premature fusion of the metopic suture which results in a triangular forehead. Causes transverse growth restriction, parallel growth expansion
Scaphocephaly Premature fusion of the sagittal suture. Creates a long, narrow, boat-shaped head. (most common)
Plagiocephaly Many suture involved, causes a flattening of the skull.
Adult sutures 1.Coronal Suture b/w frontal and parietal bones. 2.Sagittal Suture b/w two parietal bones. 3.Lambdoid suture b/w occipital and parietal bones. 4.Squamous suture b/w temporal and parietal bones.
Dural Structures involved in dural strains 1.Falx Cerebri (desecends b/w cerebral hemispheres in the longitudinal fissure). 2.Flax cerebelli. 3. Tentorium Cerebelli (dura b/w inferior occipital lobes and the cerebellum). **strains can compress peripheral nerves' entrance and exit.
Changes of the Eustachian tube Connects middle ear/ mastoid air cells with nasopharynx. Begin horizontal and end more vertical.
Created by: WeeG



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