XI. Sensory Systems PMU-Physiology

all skin receptor are encapsulated

the receptive fields of touch receptor are uniform in area

the nociceptors of the skin are bare nerve endings

sensory information from the skin reaches the brain via the dorsal pathway

sensory information from the skin is stored in the hypothalamus

hypermetropia may be corrected by diverging lens

the focus of the eye is controlled by parasympathetic innervation of ciliary body

the lens is the chief refractive element of the eye

when the eye focuses on a distant object the ciliary muscle contracts

the focus of the eye is controlled by sympathetic innervation of the ciliary body

the intraocular pressure is about 1,5 mm Hg

when light is directed to one eye, both pupils constrict

the pupils dilate when the eye is focused a near object

the aqueous humour is an ultrafiltrate of plasma

the pupils constrict when the eye is focused on a distant object

protanopes cannot distinguish between red and green because they lack the ligament for detecting green light

full colour vision is possible in dim light

full dark adaptation takes nearly 30 min

in a dark-adapted eye, the visual activity is the best in the centre of the visual field

in the retina there are more ganglion cells than photoreceptors