Postnatal and Child Development Flashcards
development of the brain in a 4 week old embryo: four main sections in dorsal view
future forebrain (prosencephalon) future midbrain (mesencephalon) future hindbrain (rhombencephalon) future spinal cord
list the flexures present in the developing brain in a 4 week old embryo in side on view
cephalic flexure
pontine flexure
cervical flexure
development of the brain in a 5 week old embryo
fore/mid/hind brain develops
fore: telencephalon, diencephalon
mid
hind: pons, medulla
development of the brain in a 8 week old embryo
hemispheres and cerebellum developing
formation of ventricular system: aqueduct, 3rd/4th ventricle
list association cortices in the brain
motor
sensory
visual
prefrontal
features of association cortices
fx less predictable
not organised topographically
left-right symmetry weak or absent
what association cortex is associated with ADHD?
prefrontal
what part of the spinal cord is responsible for motor neurons?
grey matter in the anterior section of the cord
how is the grey matter in the anterior section of the spinal cord divided?
proxima
distal
flexors
extensors
list pyramidal tracts
lateral corticospinal
anterior corticospinal
list extra-pyramidal tracts
rubrospinal
reticulospinal
vestibulospinal
olivospinal
reticulospinal tract is responsible for?
coordinating automated movements of locomotion posture e.g. to painful stimuli
rubrospinal tract is responsible for?
automatic movements of arm in response to posture/balance changes
vestibulospinal tract is responsible for?
regulates posture to maintain balance, facilitates mainly alpha motor neurons of the postural, antigravity (extensor) muscles
anterior corticospinal tract is responsible for?
voluntary movements
list components of the reflex arc
stimulus > sensory receptor > sensory neuron > dorsal column > inteneuron/integrating center > motor neuron > effector
what is the Moro reflex?
when neck suddenly extended, arms abduct then adduct
when does the Moro reflex develop?
28-32 weeks gestation
when does the Moro reflex disappear?
3-6 months
the persistence of primitive reflexes can be a sign of?
impaired development
what is the stepping reflex?
baby appears to take steps or dance when held upright with his or her feet touching a solid surface
how long does the stepping reflex last?
~2months
what is the grasp reflex?
Stroking the palm of a baby’s hand causes the baby to close his or her fingers in a grasp
how long does the grasp reflex last?
5-6 months
9-12 in the toes