L9+10: nervous tissue

Question 1

what is nervous tissue made up of ?

Answer 1

neurons and supporting cells

Question 2

what are the supporting cells in nervous tissue called?

Answer 2

neuroglia

Question 3

how many pairs of spinal nerves are there in the peripheral nervous system ?

Answer 3

31

Question 4

what parts make up the brain stem ?

Answer 4

pons , mid brain , and medulla oblongata

Question 5

what is the largest part of the brain?

Answer 5

cerebrum

Question 6

what are the 2 cerebral hemispheres of the cerebrum ?

Answer 6

outer layer of grey matter

inner layer of white matter

Question 7

what is the outer covering of the grey matter over the hemisphere called ?

Answer 7

cerebral cortex

Question 8

which cerebral hemisphere of the cerebrum contains myelinated nerve fiber and which one contains unmyelinated nerve fibers?

Answer 8

grey matter contains unmyelinated nerve fibers

white matter contains myelinated nerve fiber

Question 9

what structure is responsible for basic vital life functions such as breathing , heartbeat ,and blood pressure ?

Answer 9

the brain stem

Question 10

what part of the brain is responsible for voluntary muscular movement , posture and balance?

Answer 10

the cerebellum

Question 11

what are the 2 divisions of the peripheral nervous system ?

Answer 11

sensory / afferent division and motor/ efferent division

Question 12

what are the 2 further divisions of the efferent division ?

Answer 12

autonomic and somatic nervous systems

Question 13

what nervous system do the sympathetic and parasympathetic divisions belong to ?

Answer 13

autonomic nervous system

Question 14

Nervous system #2

Answer 14

….

Question 15

what is the function of neuroglia / supporting cells ?

Answer 15

• Phagocytoses
• Forming myelin sheath
• Forming brain barrier
• Producing cerebral spinal fluid (CSF)

Question 16

do neurons contain centrioles?

Answer 16

no

Question 17

what is the difference between dendrites and axons ?

Answer 17

dendrites are highly branched and irregular , contain nissl substancce and impulses travel through them towards the cell body

axons are long cylendrical structures without nissl substance and impulses travel through them away from the cell body

Question 18

where is the axon hillock present on a neuron ?

Answer 18

just below the cell body

Question 19

describe the cell body (perikaryon or soma) of a neuron .

Answer 19

they have large roubd nuclei with single prominent neucleous and their cytoplasm is abundantly supplied with golgi bodies and lysosomes

they also contain:

nissl substance , neurofibrils , and pigment granules

Question 20

what is nissl substance ?

Answer 20

granular material composed of rough endoplasmic reticulum

Question 21

sensory / afferent neurons are typically ____

Answer 21

unipolar

Question 22

motor/efferent neurons are always ___

Answer 22

multipolar

Question 23

what cell is responsible for the myelination of peripheral nervous system neurons ?

Answer 23

schwan cells

Question 24

what cell is responsible for myelination of central nervous system neurons ?

Answer 24

oligodendrocytes

Question 25

what are the functions of schwan cells ?

Answer 25

provide nutrients

phagocytosis

repair and maintenance

Question 26

what is a ganglion ?

Answer 26

collection of neuronal cell body outside Central nervous system