Neuroanatomy slides Part 1

Nodes of Ranvier

unmyelinated sections of axon

saltatory conduction

the jumping of action potentials from node to node

What are the two examples of different cells

1. oligodendrocytes (CNS)

2. Schwann cells (PNS)

Oligodendrocytes

Type of glial cell in the CNS that wrap axons in a myelin sheath.

Schwann cells

Type of glia in the PNS, Supporting cells of the peripheral nervous system responsible for the formation of myelin

synaptic vesicles

Terminal End Bouton

The terminal region of telodendria that houses synaptic vesicles

What type of reaction is neurotransmission?

Electrochemical

Affrent neurons

coming up

Efferent neurons

going out

What can the sensory and motor divisions of the PNS be divided into?

1. Visceral: internal organs (involuntary)

2. Somatic: external body- muscles, skin etc. (voluntary)

Filum terminale

cauda equina

conus medullaris

cervical enlargement

supplies nerves to the shoulder and upper limbs

Central canal

posterior grey column

anterior median fissure

posterior intermediate sulcus

B

soma

cell body of neuron

axon

transmit information away from cell body

dendrite

transmit information toward the cell body

myelin sheath

layer of white, fatty covering that speeds up the conduction

synaptic cleft

What are the main divisions of the CNS

Brain and spinal cord

What are the two main divisions of the peripheral nervous system?

Sensory division and motor division

What are two main divisions of the visceral motor division of the PNS?

Sympathetic: Fight or flight

Parasympathetic: Rest and digest

Cerebral Spinal Fluid (CSF)

Fluid, produced by ventricles, found within Spinal Cord and in covering surrounding CNS

Anterior grey column

posterior median sulcus

Ventral horn

dorsal horn