Spinal Cord and Nerves

Question 1

31 Spinal Nerves

Exit BELOW vertebrae with the same number (named for disc above it)

Above C7, exit ABOVE disc with same number (named for disc below it)

Answer 1

8 Cervical

12 Thoracic

5 Lumbar

5 Sacral

1 Coccygeal

Question 2

Cervical enlargement

Answer 2

For nerves C5-T1. Upper extremity nerves

Question 3

Lumbosacral enlargement

Answer 3

For nerves L1-S3

Lower extremity innervation

Question 4

Efferent

Answer 4

Motor innervation to trunk, neck, and limbs (Somatic) and smmoth & cardiac muscle (Visceral)

Question 5

Dorsal Rami

Answer 5

Do NOT form plexus

Sensation from dorsum of scalp, neck, and back

Motor innervation to muscles of neck and deep back (Erector spinae)

Autonomic innervation to visceral structures of neck and back

Small, Short

Question 6

Ventral Rami

Answer 6

Fuse together to form 4 plexuses

Give rise to all the major nerves

Question 7

Cervical Plexus (Ventral Rami)

Answer 7

C1-C4; Supply somatic and autonomic innervation to anterior and lateral neck

Question 8

Brachial Plexus

Answer 8

C5-T1; Autonomic and somatic innervation to upper limb

Question 9

Intercostal Nerves & Subcostal Nerve

Answer 9

T2-T11 and T12 (Subcostal)

Do NOT form plexus

Segmentally innervate anterolateral thoracic and upper abdominal walls

Question 10

Lumbar Plexus

Sacral Plexus

Answer 10

Lumbar: L1-L4

Sacral: L4-S4

Innervation to lower ab wall, pelvis, and lower limb

Question 11

Dorsal Roots

Answer 11

Afferent Sensory Info

Join together in ganglion

Question 12

Ventral Roots

Answer 12

Strictly efferent (Motor) signals

Question 13

Intervertebral discs named after

Answer 13

vertebrae above it (1st one is C2)

Question 14

Nerve that exits ___ the disc is effected by evulsion

Answer 14

Below

Disc +1 = damaged nerve