Peripheral Nervous System Flashcards
Plexus
A network of interconnecting nerves
Dermatome
An area of skin that is supplied by a single spinal nerve
Myotome
Group of muscles innervated by a single spinal nerve
Visceral efferent nerves can be divided into . . .
Sympathetic and parasympathetic
. . . efferent nerves innervate the viscera (organs) and periphery (vasculature and sweat glands)
Sympathetic
. . . efferent nerves innervate the viscera (organs) only
Parasympathetic
Ganglion
A collection of cell bodies outside the CNS
Nucleus
A collection of cell bodies inside the CNS
Where do afferent fibres have their cell bodies?
Spinal ganglia
Visceral afferent nerves carry information from the . . .
Viscera (thoracic, abdominal and pelvic organs)
How is the conduction velocity of a peripheral nerve classified?
Letters A, B, and C
A is the fastest
How is the axonal diameter of a peripheral sensory nerve classified?
Roman numerals I-IV
I is the largest
What are the 3 layers of connective tissue in a peripheral nerve, and where are they located?
Epineurium - External layer
Perineurium - Covering individual fascicles
Endoneurium - Covering individual axons
How are peripheral nerves arranged?
Into fasciculi
What are the two types of internal receptor?
Proprioceptor - movement and joint position
Enteroceptor - movement through guts and blood pH