Intro to Nervous System Flashcards Preview

ESA4 - Nervous System > Intro to Nervous System > Flashcards

Flashcards in Intro to Nervous System Deck (32):
1

Is the cerebral cortex grey or white matter?

Grey matter

2

Is the corpus callosum grey or white matter?

White matter

3

What is grey matter composed of?

Cell bodies and dendrites, where all the synapses are

4

What is white matter composed of?

Axons and their supporting cells - connects grey matter

5

Why is white matter white?

Due to the presence of myelin (fatty)

6

What is the PNS equivalent of grey matter?

Ganglion

7

What is the PNS equivalent of white matter?

Peripheral nerve

8

How many segments is the spinal cord composed of?

31

9

Describe the distribution of grey/white matter in the cord

Central core of grey matter and an outer shell of white matter

10

Describe the distribution of grey/white matter in the brain

Central core of grey matter, surrounded by white matter, outer shell of grey matter

11

Is the dorsal root sensory or motor?

Sensory

12

Is the ventral root sensory or motor?

Motor

13

What is a funiculus?

A segment of white matter containing multiple distinct tracts - impulses travel in multiple directions

14

What is a tract?

Unidirectional connection between two regions of grey matter

15

What is a fasciculus?

A subdivision of a tract supplying a distinct region of the body

16

How is grey matter in the cord organised?

Into cell columns - Rexed's laminae

17

What is a nucleus?

A collection of functionally related cell bodies (grey matter)

18

What is the cortex?

A folded sheet of cell bodies found on the surface of the brain (grey matter)

19

What is a fibre?

An axon in association with its supporting cells (white matter)

20

What are association fibres?

Fibres that connect cortical regions within the same hemisphere

21

What are commissural fibres?

Fibres that connect left and right hemispheres or cord halves

22

What are projection fibres?

Fibres that connect the cerebral hemispheres with the cord/brainstem and vice versa

23

What does the precentral gyrus contain?

Primary motor cortex

24

What does the postcentral gyrus contain?

Primary sensory cortex

25

What does the primary visual cortex surround?

Calcarine sulcus

26

Where is the site of olfactory cortex?

Uncus of temporal lobe

27

Where is the key cortical region for memory encoding?

Parahippocampal gyrus

28

What is the optic chiasm?

A site where fibres in the visual system cross over

29

Where is the cortical area important for emotion and memory?

Cingulate gyrus

30

What is the fornix?

Major output pathway from the hippocampus

31

What is the tectum?

Dorsal part of the midbrain involved in involuntary responses to auditory and visual stimuli

32

How is CSF reabsorbed?

Circulates through ventricular system and subarachnoid space before being reabsorbed at the arachnoid granulations into venous blood via venous sinuses