Transcript Document

Spinal cord connects the brain to the PNS
Spinal cord is surrounded by
bone for protection
How big is the actual cord?
Very small!!! Look for the H!!
H is the gray matter
• The spinal cord exits the skull through a
hole known as the foramen magnum.
Extends downward
through a canal within the backbone
Spinal Cord
Contains 2 types of nerve tissue---gray and white matter
1. White
matter is myelinated (W/M)
– made mostly of interneurons
2. Gray matter is central and
unmyelinated
– made of cell bodies of motor neurons
Spinal Cord
M
White=
Myelinated
U/M
White
matter
Grey matter
Pia mater
Ventral root
Dorsal root
Arachnoid membrane
Dura mater
The spinal cord is
surrounded by
3 meninges
(membranes)
Dorsal
Ventral
Dorsal Root
contains
Sensory
neurons
Try labeling this diagram!!
Answers on the next slide!
Sensory Neuron
Effector
Spinal cord
Receptor
Central
Canal
InterNeuron
Gray
Matter
White matter
Motor Nerve
Answers!!
Different parts of the
spinal cord control
different parts
of the body
This info is used a
lot by chiropractors
& physiotherapists!
Try labeling this diagram!!