Nerves 1 Flashcards
Gyrus?
Ridge on the cerebral cortex of the brain
Sulcus?
Depression on the cerebral cortex of the brain
4 lobes of the cerebrum?
- Frontal
- Occipital
- Temporal
- Perietal
What is the diencephalon?
Posterior part of the forebrain
What two structures are found in the diencephalon?
- Thalamus
- Hypothalamus
3 parts of the brainstem?
- Midbrain
- Pons
- Medulla oblongata
Functions controlled by the brainstem?
- Basic functions
- BP, RR
Cerebellum function?
- Balance and coordination
How many pairs of spinal nerves are there?
31
How many cranial nerve pairs are there?
12
List the number of nerve pairs from cervical to coccygeal
C - 8 T - 12 L - 5 S - 5 C - 1
What is the function of nerves that leave through the ventral root?
Motor
Function of nerves that leave through the dorsal root?
Sensory
What is a ganglion?
A set of soma outside the spinal cord
What makes up the white matter?
Axons
What makes up the grey matter?
Soma
What is another name for the initial segment of an axon?
Axon hillock
What is the function of the axon hillock?
Triggers the action potential if the threshold is reached
What happens at the presynaptic terminals?
Neurotransmitter is released
What 3 types of neurones dose the somatic nervous system have
- Afferent (sensory)
- Interneurones
- Efferent (motor)
What are glia?
Support cells of the CNS
What proportion of the CNS is glia?
90%
3 types of glial cells?
- Astrocytes
- Oligodendrocytes
- Microglia
2 functions of astrocytes?
- Maintain external environment
- Maintain blood brain barrier
Function of oligodendrocytes?
- Myelination
2 functions of microglia?
Phagocytes for
- Dead neurone
- Infectious agents
