Somatosensation I Flashcards
What are the 5 functions of the somatosensory pathway?
→ Conveying sensation from the body → touch → proprioception ( sense of body position) → Heat and cold → pain and itch
How many pairs of spinal nerves do we have?
→ 31 pairs
How is the CNS connected to the body?
→ Spinal and cranial nerves
What is a nerve?
→ a bunch of fascicles
What do fascicles consist of?
→ Individual myelinated axons
What is the membrane of the fasciles called?
→ perineurium
What is the membrane of the spinal nerve called?
→ Epineurium
What is the membrane of each individual axon called?
→ Endoneurium
What do the 8 spinal nerves and the top of the thoracic nerves form?
→ Brachial plexus
→ Cervical plexus
What is the function of spinal nerves?
→ Carry information between the CNS and the periphery
How many pairs of nerves does the cervical region contain?
→ 8
How many pairs of nerves does the thoracic region contain?
→ 12
How many pairs of nerves does the lumbar region have?
→ 5
How many pairs of nerves does the sacral region have?
→ 5
How many pairs of nerves does the coccygeal region have?
→ 1
What do the dorsal roots contain?
→ Sensory afferents
What do the ventral roots contain?
→ Motor efferents (somatic)
→ Autonomic effererents
What do dorsal and ventral roots unite to form?
→ Spinal nerve
What does white matter contain?
→ Ascending and descending axon tracts
What does grey matter contain?
→ Cell bodies
→ Dendrites
→ Synapses
Where do the spinal nerves pass through?
→ Intervertebral foramina