Regarding the receptors in the skin:
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
Regarding the focusing of the eye:
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
Regarding the physiology of the eye:
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
Regarding vision:
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
