SINCE the work of Magnus and De Kleyn,1-3 a minority of clinical physiologists was interested in the "deuterospinal reflexes."4-8
In animals, anteflexion of the head causes extension of the fore limbs and flexion of the hind limbs, while in retroflexion of the head the opposite phenomenon is registered. The exception to this rule is the rabbit; the four limbs react as do the fore limbs of the other animals.9
Man seems to follow the pattern seen in rabbits, as has been described by Willemse,10 and for adult patients by Tokizane.9 In his studies on human dynamic postures, Fukuda11-13 discussed the occurrence of the righting reflex in normal adult behavior. In the handstand position the retroflexion of the head provokes extension of the extremities. This difficult posture is thus partly made possible because the body obeys the genetically determined mechanism of the righting reflex. To
BRUNIA C. Headflexion and Fukuda's Vertical Writing Test. Arch Otolaryngol. 1966;84(4):409–410. doi:10.1001/archotol.1966.00760030411006
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