PS275 Study Guide - Midterm Guide: Unit, Ossification, Muscular Development
Document Summary
Skull bones separated by 6 soft spots/fontanelles fradually filled in by minerals to form single skull by age 2. Skeletal age: interpreted by number of bones and extent of ossification. Neonates born with all muscle fibres they"ll ever have. Kicking of infants contradicts cephalocaudal rule bc hip joint is more stable and contrained than shoulder joint and thus amount of motion to be controlled is less for hip joint. Individual neurons have potential to serve any neural function, function depends on where it ends up. Rapid during brain growth spurt in first 2 years of life and last prenatal months. Infant has more neurons and neural connections than adults. Neurons that successfuly interconnect crowd out those that don"t which die in early life. Synapses can disappear if neuron not properly stimulated. First areas of cerebrum to mature are primary motor areas and primary sensory areas. Continued myelination results in increasingly complex motor activities.
