Chapter 34 Part 1- Flashcards
2 categories of Nervous system
CNS (central)- brain and spinal cord.
PNS (peripheral) remaining nerves of brain and spinal cord
CNS (central)
Reflex arc - short cut in reflex system between the spinal cord and sensory nerve.
PNS (peripheral)
3 components:
- spinal nerves
- cranial nerves
- autonomic nervous system
Spinal nerves
From spinal cord to periphery
Motor and sensory
Pairs of spinal nerves
31: Cervical- (neck)-8 Thoracic- (cheat) 12 Lumbar- (lower back) 5 Sacral- (hip) 5 Coccygeal (tail bone) 1
Where do spinal nerves exit
Spinal canal of vertebrae via intervertebral foramen.
Never end within the spinal cord do not
Regenerate and damage is usually permanent.
Pairs of cranial nerves
12. Olfactory Optic Oculomotor Trochlear Trigeminal Abducens Facial Statoacoustic (acoustic) Glossopharyngeal Vagus Accessory Hypoglossal
Olfactory nerve
Sense of smell
Optic nerve
Vision
Oculomotor
Supplies the muscles that move the eyes
Trochlear
Supplies muscle that moves eye downward/laterally
Trigeminal
Supplies teeth, oral cavity, max. Sinus, nasal cavity, and skin to face
Abducens
Supplies muscle that moves eye laterally
Facial
Muscles of facial expression
Statoacoustic
Hearing and balance (equilibrium)
Glossopharyngeal
Motor to stylopharyngeous
Sensory to posterior 1/3 of tongue
General sensations- pain, pressure, heat and cold
Vagus
Motor to larynx/pharynx
Taste and general sensations from root of tongue/epiglottis
Accessory (spinal accessory)
Supplies trapezius and SCM
Hypoglossal
Intrinsic/extrinsic muscles of the tongue
Visceral sensation
Sensation from viscera (organs) of the body
AND (autonomic)
2 parts:
- Sympathetic nervous system “fight or flight”
- parasympathetic “craniosacral outflow”
Antagonist
Have opposite actions
Sympathetic causes release of
Adrenaline
