PSY210H5 Lecture 3: Lecture 3
29 Sep 2015
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Identify what happens in what period (embryonic, zygotic, third trimester) Prematurity: preterm infant: born prior to 38 weeks after conception, weight is appropriate for gestational age. Infant reflexes: reflex: an involuntary response to external stimulation (pgs, 118, permanent. If you prick infant"s foot, they will move away. Absence of it indicates sciatic nerve damage: temporary -usually gone within first year of life, babinski, moro (startle reflex) Take foot and bring the finger to the top (stroking the foot), and baby spreads their toes. Absence of it indicates lower spine deficit. Present a loud noise and baby will startle, spread their arms and bring back to the chest. Put something cylindrical in baby"s hand, they will grasp it involuntary. Disappears by 3-4 months, after this it will be intentional grasp: plantar (toe grasp) Same idea but in the foot, they will curl the toes in. Disappears in 8-12 months: rooting, stepping, sucking.
