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lens - in lumen of eye ball a large colourless transparent more convex on back side lens present covered by lens capsulewhen white tissues are
sclerotic -white of eye outer thick made up of fibres connective tissue protective layer give definite shapeits anterior 16 part is thin transparent
conjunctiva -ectodermal in origin formed by epidermis it is thin transparent covers corneamade up of stratified epithelium it has 2 parts -i ocular
glands -1 lacrymal glands -tear glands numbers are 3its secretion is aquous amp salty keeps eye ball wet give nourishment to
eyelids -3 in number dermis is thinnest in it upper and lower eye lid with eye lashes upper eye lid is more motilein reptiles lower eye lid is more
eyehistory -stevan described it first study of eye is ophthalmology instrument used to examine interior of eye is ophthalmoscopeshape -more or
equilibrium -cristae and maculae are concerned with equilibrium1 dynamic equilibrium -cristare detect turning or rotational
middle ear -protected by tympanic bone its cavity is tympanic cavityit is lined by simple cilliated columnar epithelium it is connected to naso
ear it is phono receptor as respond to sound wavesit is teloreceptor as receive stimuli from far distanceit is stato-acousting organ as concerned
receptors are sense organs that receive stimulion the basis of their location in body receptors are of following types -1
differences between man amp rabbit -sno 1man brain roundrabbit elongated2olfactory lobes embeded in cereberumsome what clear3olfactory lobes
defects of nervous system -1 ataxia - lack of muscle-cordination due to damage of cerebellum2 dyslexia - in
nerve impulse its generation -it is an electro chemical phenomenon manifested through ionic movement across cell membraneit was discovered by a l
difference between unconditioned and conditioned reflex action-sno 1unconditioned it is inbornconditioned acquired2it does not require
conditioned reflex -response which is achieved by training is conditioned reflexi p pavlov in 1920 displayed it by experimenting on dogthese are
difference between adrenergic and cholinergic fibre-sno 1adrenergic fibre release nor adrenaline at theircholinergic fibre release
difference between sympathetic and parasympathetic nervous system -snosympatheticperasympathetic1components are visiblenot visible2ganglions linked
ans autonimic nervous systemname given by langley controled by hypothelamus partially independent systemcontrols involuntary actions as heart beat
spinal nerves31 pairs mixed type total weight 150 gmsat the base of origin of spinal nerves gland of swammardon or calcarious ganglion is
cranial nerves12 pairs total weight 12 gmsupto amphibian 10 pairs cranial nerves are present1 2 8 - sensory 3 4 6 11 12 motor 5 7 9 10 - mixed3 7 9
spinal cord myelonit is part of cns 45 cm long in woman 43 cm amp weight 35 gmsorigin from lower part of medulla oblongetashape -long cylindrical
medulla oblongata -conical in appearance lower most part of hind brain its lumen is metacoel or 4th ventriclean oval mass pons virolli lies above
hind brain -1 cerebellum -little part lies below the posterior part of cerebrum amp above the medulla oblongetait conists of
mid brain -optics lobes 4 in number corpora quadrizemmini in frog corpora bizemminisolid optocoel is absent 2 superior coculi and 2 inferior coculi
diancephalon -less visibleoccupies only 1 of brains volumeits lumen is diocoel or iii ventricleroof is epithalamuson it pineal body is presentfloor