Chapter 11- Nervous System Flashcards
Soma
Cell body
Contains the nucleus
Dendrite
Branches of a tree
Receive signals from other neurons and conduct the information to the cell body
Axon
Carries signals away from the cell body
Myelin sheath
Insulates the axon
PNS- Schwann cells
CNS- oligodendrocyte
Nodes of ranvier
Gaps in the myelin sheath
Synaptic knob
Vesicles containing a neurotransmitter
Neurilemma
Essential for injured nerves to regenerate
Grey matter
Lack of myelin
Contains cell bodies of motor neurons and interneurons
White matter
Abundance of myelin
Bundles of axons called tracts
Carry nurse impulses from one nervous system to another
Central canal
Carries cerebral spinal fluid through the spinal cord
Dura mater
Outer layer of spinal cord
Arachnoid mater
Middle layer surrounding the spinal cord
Subarachnoid mater filled with cerebral spinal fluid
Piamater
Inner most layer surrounding spinal cord
C1-C4 spinal nerves
Cervical plexus- muscles on skin of neck,top of shoulders, and part of the head
Phrenic nerve- diaphragm for breathing
C5-T1 nerves
Brachial plexus- lower part of the shoulder and arm Auxiliary nerve- passes close to armpit Radial nerve Ulnar nerve Median nerve