1. PNS bridge CNS to & from nerve endings or receptor cells.

1. PNS bridge CNS to & from nerve endings or receptor cells.
2. DRG and Cranial nerve nuclei have peripheral projections terminating as receptor endings in supporting cell and mesodermal organizations that define their sensory modalities.
3. Olfactory receptor cells have axons that project into the CNS.
4. Auditory, vestibular & taste have axon-less receptor cells contacted by the peripheral projection of bipolar cells in cranial nerve ganglia.
5. Receptor cell modalities are established by the combined organization of receptor cells, supporting cells and mesodermal organization.
6. Efferents systems are: A) ventral horn cell axons and motor end organs for innervating striated muscle of both skeletal movement and setting the length of the receptor’s muscle spindle (gamma efferents). B) preganglionic axons to sympathetic ganglia containing postganglionic neurons. C) Postganglionic neurons to integument and blood vessels. D) parasympathetic axons of cranial nerves to the orbit, salivary glands, and thoracic and abdominal viscera and sacral 2, 3, 4 segment nerves to pelvic viscera.
7. Typical spinal nerves are found from Thoracic 1 through T12.
8. The brachial plexus arises from C5- C8 and the lumbosacral plexus from L4-S3 for appendage distribution as extension of dermatomes and muscle connections distally at C7-8 & L3-S3.
9. The peripheral NS crossing the subarachnoid space is bathed in in CSF.

2. DRG and Cranial nerve nuclei have peripheral projections terminating as receptor endings in supporting cell and mesodermal organizations that define their sensory modalities.