Osteology of the Skull: 12 Newborn Skull



this is a newborn skull and the most striking feature of the neonatal skull is the disproportion between the cranium and the facial skeleton the cranium is very large in proportion to the face and this can be understood because for one reason the nervous system is always ahead of the other parts of the body in development and because the bones of the face are not yet developed the paranasal sinuses are not yet developed and the teeth are have not yet been erupted the development of the teeth and the development of the paranasal sinuses will result in a great increase in the size of the face the bones especially those bones of the vault of the skull they are not tightly attached to each other and there are large gaps between these bones and the largest of these gaps is located here at the brakeman this is the site of the anterior fontanelle and you can also notice that the frontal bone is in two pieces here and in between them is the new topic suture posteriorly here at the site of the lambda is the site of the posterior fontanelle those fontanelle's are covered by fibrous tissue and they will ossify later in life by the second year of age they are ossified those gaps in between the bones help in molding of the skull that takes place during its passage down the birth canal the presence of the fontanelles in the baby also permit the continued growth of the brain to take place in an expansive compartment premature suture closure can have adverse effects on brain development clinically speaking the presence of the fontanelles enables the physician to determine the progress of growth in the surrounding bones and also enables the determination of the degree of hydration of the baby for example of the fontanel's are depressed they indicate dehydration and also they indicate the state of intracranial pressure a bulging fontanel indicates that there is increase in intracranial pressure blood may be obtained from the fontanel's as well as CSF can be obtained another feature of the newborn skull is seen in the temporal bone this is the temporal bone here and you can see that there is the mastoid process is not developed the absence of the mastoid process renders the facial nerve exposed because the facial nerve arises here deep to the mastoid process between the mastoid and the styloid process at the forum is called the style of mastoid foramen and this might result in injury of the facial nerve in case of difficult labor or forceps delivery the facial nerve might be injured because it is exposed the tympanic plate is very short it's in the form of a ring rather than a plate and this makes the eardrum very superficial also you can see here that the mandible has no teeth and note the angle of the mandible the angle here is an obtuse angle it is not a perpendicular angle like in the adult so those are the most important differences of the neonatal skull from the ED of the skull to summit them up the presence of wide gaps in between the bones especially in the region of the fontanel's this is the anterior fontanelle here the presence of a me topic suture here the presence of symphysis Mendte in between the two parts of the mandible two halves of the mandible the mandible is a dentist and the angle of the mandible is obtuse the mastoid process is not developed and the tympanic plate is in the form of a ring and of course as I mentioned earlier there is a small facial skeleton in comparison with the cranium and this is because of the under development of the paranasal sinuses and the absence of the teeth you

14 Replies to “Osteology of the Skull: 12 Newborn Skull”

  1. I bumped my head when I was young.. it changed the shape of my head.. now im 22 and I have a funny projection on my head like skull. is it possible to remove it by surgery ?

  2. That looks great. We too fabricate realistic adult human skulls that are used for medical imaging instead of real cadavers. 🙂

  3. I never knew this. One day I was changing my daughter and I had to stop because I thought I dented her head. It freaked me out

  4. My book also mentioned about anterolateral i.e sphenoidal fontanelle which fuses 2-3 months after birth and posterolateral i.e mastoid fuses at the end of first year.

    Thank you so much for taking out time and making the videos available for every one, thank you once again 🙂

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