efferent components of the PNS WS Unit 2

anatomy

define efferent neurons

multipolar neurons that relay signals out of the CNS

what are the two main types of efferent neurons

somatic and autonomic

what are the 2 groups of autonomic neurons

parasympathetic and sympathetic

where does the parasympathetic neuron originate

cranial and sacral regions of the CNS

where does the sympathetic neurons originate

thoracic and lumbar regions

what is the length of the PREganglionic neuron for parasympathetic

long preganglionic

what is the length of the PREganglionic neuron for sympathetic

short preganglionic

what is the length of the POSTganglionic neuron for parasympathetic

short post ganglionic

what is the length of the POSTganglionic neuron for sympathetic

long post ganglionic

what is the NT released by POST ganglionic neuron for parasympathetic

cholinergic (acetylcholine)

what is the NT released by POST ganglionic neuron for sympathetic

adrenergic (neopinephrine)

how many pairs of cranial nerves branch from the brain

12 pairs

how many pairs of spinal nerves branch from spinal cord

43 pairs

how many neurons are in the path of somatic neurons

one

how many neurons is in the path of autonomic neurons

two

what is dual innervation

target tissue is synapsed upon by both sympathetic and parasympathetic neurons

what are the 3 basic types of afferent neurons

specialized dendritic ending, free dendritic ending, seperate cells that synapses with afferent neuron

what do mechanoreceptors detect

touch and pressure

what do nocireceptors detect

pain and itch

what is the receptive field

area with the sensory receptors

what is the spinalthalamic ascending pathway

contralateral, afferent neuron enters in and crosses through other side

what is the dorsal columns ascending pathway

(ipsilateral), afferent neuron enters in and DOESNT cross through