Anatomy: nervous system Flashcards Preview

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Flashcards in Anatomy: nervous system Deck (36)
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1

Sensory functions

Pain
Touch
Temperature
Senses

2

Motor functions

Movement

3

Composition of neurones

Dendrites
Body (contains nucleus)
Axon (nerve fibre which carries APs)
Myelin sheath (covers axon)

4

Afferent neurones

Sensory
Brings signal towards the CNS

5

Efferent neurones

Motor
Projects away from the CNS

6

Synapse

Site of chemical communication between neurones
Neurones meet but don't physically touch
Ensures that only truly meaningful info is conveyed along the neurone chain

7

Somatic nervous system

Body wall (external environment)
eg: skin, skeleton, lining of body cavities

8

Autonomic nervous system

Visceral motor system
Internal environment
Involuntary
sympathetic & parasympathetic
eg: organs

9

Grey matter of the cerebral cortex is outer/inner

Outer

10

White matter of the cerebral cortex is outer/inner

Inner

11

Brainstem

Pons
Medulla oblongata
Becomes the SC when it leaves the cranial vault (via foramen magnum)

12

SC is shorter/longer than vertebral column

Shorter

13

Where does CNI arise

Cerebrum

14

Where does CNII arise

Thalmus

15

Where does CNXI arise

Spinal cord

16

Where does CNIII-CNX & CNXII arise

Brainstem

17

Where are spinal nerves located

Within intervertebral foramina (the space between adjacent vertebrae)

18

Anterior roots & rootlets ?
(sensory/motor/mixed)

Motor
think - ARM

19

Posterior roots & rootlets ?
(sensory/motor/mixed)

Sensory

20

Anterior & posterior rami?

Mixed

21

How are spinal nerves named?

According to the vertebrae above it
(except in the cervical region where they are named according to the vertebrae below it)

22

What does posterior rami supply?

Posterior median strip of each body segment

23

What does anterior rami supply?

Everything that the posterior rami doesn't cover

24

Sympathetic nerves (ANS)

Originates in brain
Passes doen SC
Exits SC with T1-L2 spinal nerves (thoracolumbar outflow)
in anterior roots & rootlets
Travels to sympathetic chains
Passes into all spinal nerves and hitch a ride with them
Pass into splanchnic nerves to supply organs

25

Parasympathetic nerves (ANS)

Cranio-sacral outflow - Leave CNS via CNIII, VII, IX, X and sacral spinal nerves
Supply internal organs
Long presynaptic fibre
Synapse occurs at organ
Short postsynaptic fibre

26

Where is the level of the male nipple

T4

27

Where is the level of the umbilicus

T10

28

Dermatome

Area of skin supplied by both anterior and posterior rami of a spinal nerve

29

Body wall sensory & motor supply

Sensory - somatic sensory
Motor - somatic motor

30

Organs sensory & motor supply

Sensory - visceral afferent
Motor - sympathetic and parasympathetic