What is normal gestational period?
38-42 weeks
Conceptual age =
age of a fetus or newborn in weeks since conception
Sensorimotor Development in each trimester:
Muscle spindle
1st- muscle starts to differentiate; tissue becomes specialized-
2nd- motor end plate forms; clonus response to stretch
3rd- some muscles are mature and functional, others still maturing
Sensorimotor Development in each trimester:
Touch and tactile system
1st- *first sensory system to develop! Response to tactile stimulus
2nd- receptors differentiate
3rd- touch functional; actual temp discrimination at the end of 3rd trimester; most mature sensory system at birth
Sensorimotor Development in each trimester:
Vestibular system
1st- functioning at the end of first trimester (not completely developed).
(no more!)
Sensorimotor Development in each trimester:
Vision
1st- eyelids fused; optic nerve and cup being formed
2nd- startle to light; visual processing occurs
3rd- fixation occurs; able to focus (fixed focal length)
Sensorimotor Development in each trimester:
Auditory
2nd- Will turn to auditory sounds
3rd- debris in middle ear, loss of hearing
Sensorimotor Development in each trimester:
Olfactory
3rd- nasal plugs disappear, some olfactory perception
Sensorimotor Development in each trimester:
Taste
1st- taste buds develop
3rd- Can respond to different tastes (sweet, sour, bitter, salt)
Sensorimotor Development in each trimester:
Movement
1st- sucking, hiccuping; fetal breathing; quick generalized limb mvmt; positional changes; 7.5 weeks can bend neck and trunk away from perioral stroke
2nd- quickening; sleep states; grasp reflex; reciprocal and symmetrical limb mvmts
3rd- 28 weeks primitive motor reflexes; rooting, suck, swallow; palmar grasp; plantar grasp; MORO; crossed extension
Development of Sensorimotor Integration:
Prenatal period
Development of Sensorimotor Integration:
Neonatal period
Development of Sensorimotor Integration:
First 6 months
Development of Sensorimotor Integration:
6-12 months
Development of Sensorimotor Integration:
13-24 months
Development of Sensorimotor Integration:
2-3 years
Development of Sensorimotor Integration:
3-7 years
Reflexes (onset age, integration age, stimulus, response, relevance):
Rooting
onset 28 weeks gestation
integration 3 months
stimulus- stroke the corner of the mouth, upper lip, and lower lip
response- mvmt of tongue, mouth, and/or head toward stimulus
relevance- allows searching for and locating feeding source
Reflexes (onset age, integration age, stimulus, response, relevance):
Suck-swallow
onset 28 weeks gestation
integration 2-5 months
stimulus- place you index finger inside infant’s mouth with head in midline
response- strong rhythmical sucking
relevance- allows ingestion of nourishment
Reflexes (onset age, integration age, stimulus, response, relevance):
Traction
onset 28 weeks gestation
integration 2-5 months
stimulus- grasp infant’s forearms and pull-to-sit
response- complete flexion of upper extremities
relevance- enhances momentary reflexive grasp
Reflexes (onset age, integration age, stimulus, response, relevance):
Moro
onset 28 weeks gestation
integration 4-6 months
stimulus- rapidly drop infant’s head backward
response- 1st: arm extension/abduction, hand opening. 2nd: arm flexion and adduction
relevance- facilitates ability to depart from dominant flexor posture: protective response
Reflexes (onset age, integration age, stimulus, response, relevance):
Plantar grasp
onset 28 weeks gestation
integration 9 months
stimulus- apply pressure with thumb on the infant’s ball of the foot
response- toe flexion
relevance- increases tactile input to the sole of foot
Reflexes (onset age, integration age, stimulus, response, relevance):
Galant
onset 32 weeks gestation
integration 2 months
stimulus- hold infant in prone suspension, gently scratch or tap alongside the supine with finger, from shoulders to butt
response- lateral trunk flexion and wrinkling of the skin on the stimulated side
relevance- facilitates lateral trunk mvmts necessary for trunk stabilization
Reflexes (onset age, integration age, stimulus, response, relevance):
Asymmetric tonic neck
onset 37 weeks gestation
integration 4-6 months
stimulus- fully rotate infant’s head and hold for 5 seconds
response- extension of extremities on the face side, flexion of extremities on the skull side
relevance- promotes visual hand regard