Intro to Anatomy Flashcards
the spinal cord has how many pairs of spinal nerves?
- 31
how many cervical nerves?
- 8
how many thoracic nerves?
- 12
how many lumbar nerves?
- 5
how many sacral nerves?
- 5
how many coccygeal nerves?
- 1
what are plexuses
- branches of nerves that come together and innervate structures in the limbs
ventral roots contain axons of which nerves?
- motor nerves
ventral roots convey impulses in what direction of the spinal cord?
- away from the spinal cord
dorsal roots contain axons of which nerves?
- sensory nerves
dorsal roots convey impulses in what direction of the spinal cord?
- toward the spinal cord
the spinal nerve conveys which axons
- motor and sensory
what are the branches of spinal nerves called?
- rami
dorsal rami conveys nerves axons where?
- to and from muscles of the back and overlying skin of the back
ventral rami conveys nerve axons where?
- to and from the body wall (torso) and/or upper and lower limbs
motor nerves innervate
- skeletal or striated muscle
cell bodies of somatic motor nerves reside where?
- ventral horn of the spinal cord
somatic sensory nerves convey what?
- senses like pain, touch, and temperature into the spinal cord/CNS
cell body of sensory nerves reside where?
- dorsal root ganglion
what innervates the muscles and skin along the thoracic wall?
- ventral rami of thoracic spinal nerves
what is the ventral ramus of a thoracic spinal nerve called?
- intercostal nerve
which dermatome corresponds to the level of the nipples?
- T4
which dermatome corresponds to the level of the umbilicus?
- T10
somatic motor nerves convey impulses where?
- from CNS to skeletal muscles
