Body Plan 10: Spinal Cord and Vertebral Column Flashcards
Spinous Process
A spinal bone that sticks out
How many vertebrae are in the spine?
33
How many dermatomes, myotomes & spinal nerves?
31
How many somites?
35
What are the vertebrae divisions?
7 cervical, 12 thoracic, 5 lumbar, 5 sacral sarcum, 4 coccygeal
What are the spinal nerve divisions
8 cervical, 12 thoracic, 5 lumbar, 5 sarcal sercum, 1 coccygeal
Where do the cervical spinal nerves come out relative to the vertebrae divisions?
Above the respective vertebral section (C8 comes out under the 7th vertebra)
Where do the non-cervical spinal nerves come out relative to the vertebrae divisions?
Under the respective vertebral section
What happens when C2 is injured?
Respiratory failure
What happens when C4-C7 is injured?
quadriplegia
What happens when T2-T9 is injured?
paraplegia
What happens when T12 is injured?
paralysis of rectum and bladder; anesthesia of buttocks, back of thighs, soles of feet
On average, where does the spinal cord stop?
L2
Dermatome
Area of skin supplied by a single spinal nerve or spinal cord level
Myotome
Portion of skeletal muscle(s) innervated by a single spinal nerve or spinal cord level
