8. Organisation of the Peripheral Nervous System Flashcards
Define DERMATOME and MYOTOME
Dermatome: a SLICE of SKIN
Myotome: a SLICE of MUSCLE
which SPINAL ROOT is SENSORY (and where is it going into)
DORSAL / POSTERIOR
into DORSAL / ALAR HORNS of GREY MATTER - pointy
which SPINAL ROOT is MOTOR (and where is it coming from)
VENTRAL / ANTERIOR
from VENTRAL / BASAL HORNS of GREY MATTER
which part of PNS is in ROSTRO-CAUDAL AXIS (top to bottom)
CRANIAL NERVES
in PNS SPINAL NERVE ROOT -> SPINAL NERVE for OVER THE TRUNK
how is it for LIMBS
ROOT -> PLEXUS -> NERVE
Name the 2 GANGLIA of the PNS
- DORSAL ROOT GANGLION : where cell bodies of sensory neurones are
- AUTONOMIC GANGLION (SYMPATHETIC) : contains cell bodies of the post ganglionic autonomic axon
(contain the ONLY SYNAPSES in the PNS)
SENSORY system uses what type of nerve cells
UNIPOLAR cells in the DRG
MOTOR system uses what
(ALPHA) MOTOR NEURON in the ANTERIOR / VENTRAL HORN
AUTONOMIC system uses what
AUTONOMIC GANGLIA and PRE/POST FIBRES
where is the place that has the ONLY SYNSAPSES in the PNS
AUTONOMIC GANGLIA
which CRANIAL NERVES arise from the BRAINSTEM
therefore these are PERIPHERAL
3 - 12
Occulomotor
Trochlear
Trigeminal
Abducens
Facial
Vestibulocochlear
Glossopharyngeal
Vagus
Accessory
Hypoglossal
(all EXCEPT Olfactory and Optic)
which CRANIAL NERVES come from the MIDBRAIN
3 & 4
OCCULOMOTOR & TROCHLEAR
(eye movement)
which CRANIAL NERVES come from the PONS
5, 6, 7, 8
TRIGEMINAL, ABDUCENS, FACIAL, VESTIBULOCOCHLEAR
which CRANIAL NERVES come from the MEDULLA
9, 10, 11, 12
GLOSSOPHARYNGEAL, VAGUS, ACCESSORY, HYPOGLOSSAL
where does FACIAL NERVE arise from
PONS
where does TROCHLEAR NERVE arise from
MIDBRAIN
where does VAGUS NERVE arise from
MEDULLA
where does ABDUCENS NERVE arise from
PONS
where does TRIGEMINAL NERVE arise from
PONS
where does the GLOSSOPHARYNGEAL NERVE arise from
MEDULLA
where does VESTIBULOCOCHLEAR NERVE arise from
PONS
MIDBRAIN consists of what for processing
- CORTICOSPINAL TRACTS,
- S. NIGRA
- AUDITORY & VISUAL REFLEX CENTRES
PONS consists of what for processing
CEREBRO-CEREBELLAR RELAYS
also Apneustic and Pneumotaxic centres for respiration
MEDULLA consists of what for processing
- LONG TRACTS
- RESPIRATORY and CARDIAC CENTRES
what GANGLIA are CRANIAL (not in PNS)
- SENSORY GANGLIA (drg equivalents)
- PARASYMPATHETIC GANGLIA (pns has sympathetic)
what does RAMUS mean
BRANCH
RAMI of the SPINAL NERVE that come after the roots
VENTRAL RAMI (important) - lateral and ventral (anterior)
DORSAL RAMI - supplies skin and muscles of the back (posterior)