general arrangement nervous system

Question 1

receptors

Answer 1

are special nerve terminals
-exteroreceptors: in skin
-proprioreceptors: in muscle, tendon, joints
-interoreceptors: in inner organs + vessels

*afferent sensory fibers arise in receptors
-are the projections of sensory n. cells
(pseudounipolar or bipolar).
-they’re contained outside CNS
-in sensory ganglia of spinal + cranial nerves

*somatosensory fibers carry info from soma
(skin, muscles, bones, joints)
*viscerosensory fibers: carry info from inner organs

Question 2

effectors

Answer 2

are striated muscles or inner organs/vessels

-efferent motor fibers terminate on effectors
–>they’re projection of motor nerve cells
(contained w.in cns)

Question 3

In the cns

Answer 3

sensory+motor nerves grouped to form
sensory og motor centers (nuclei)
-divided into:
a) cortical (higher regions)
b) subcortical regions
c) lower centers

-centers are con. by nerve tracts
-sensory centers interconn. by sensory nerve tracts (pathway)
-motor centers interconn. by motor nerve tracts (pathway)

Question 4

sensory centers (nuclei)

Answer 4

1) cortical (higher):
postcentral gyrus + other

2) diencephalon (thalamus + metathalamus)

3) lower centers:
-sensory nuclei of cranial nerves
-nucleus gracilis and cunaetus in oblongata
-sensory nuclei in spinal cord (dorsal ganglion)

Question 5

motor centers (nuclei)

Answer 5

1)cortical: precentral gyrus

2) subcortical:
-basal nuclei
-diencephalaon (thalamus, subthalamus, hypothalamus)
-mesencephalon (red nucleus, substantia nigra)
-vestibular nuclei
-cerebellum

3)lower centers:
-motor nuclei cranial nerves
-motor nuclei spinal cord (ventral horns)