BIOL 120 Lecture Notes - Lecture 26: Osteoporosis, Hyaline Cartilage, Vestigiality
Document Summary
Fetal skull is soft because it is still being developed from hyaline cartilage. Frontanelles sutures are not finished (these are soft spots on the skull) It is unsolidified until about 2 years of age. At first, the brain is growing faster than any part of your body, so flexible skull gives. Baby has to pass through pelvic inlet - one parietal bone tucks underneath the brain an opportunity to grow other making the fetal skull narrowed side by side. Occipital tucks up underneath parietal so it is shorter front to back. 1st 7 vertebrae (basically those in the neck) cervical vertebrae (c1-c7) Have buttons that are transverse process supports & articulates with each pair of ribs. Last 5 vertebrae lumbar vertebrae get larger in inferior direction. Transverse processes are there for points of muscle attachment. Because they are there for muscle attachment. Sacrum bones have fused made up of 5 sacral vertebrae that have fused into one.
