Spinal Nerves & their branches (Quiz 2)

Question 1

Spinal nerves arise from the dorsal and ventral horns as…

Answer 1

rootlets

Question 2

Rootlets give rise to…

Answer 2

ventral and dorsal nerve roots

Question 3

The ventral nerve root carrying motor fibers will merge with the dorsal nerve root carrying sensory fibers within or just proximal to the IVF to form a…

Answer 3

mixed spinal n.

Question 4

Immediately after the spinal nerve exits the IVF it splits into a…..

Answer 4

ventral and dorsal ramus

Question 5

What does the ventral/anterior rami give rise to?

Answer 5

-recurrent meningeal n.
-plexuses (parasympathetic plexus)
-intercostal nerves

Question 6

What does the dorsal/posterior rami give rise to?

Answer 6

-medial branch
-lateral branch

Question 7

What arises from the ventral rami just distal to the IVF at each level (sensory and motor fibers)?

Answer 7

recurrent meningeal nerves

Question 8

Recurrent meningeal nerves include fibers from the gray communicans. Are these parasympathetic or sympathetic fibers?

Answer 8

sympathetic fibers

Question 9

What nerves carry pain and proprioception fibers and can be responsible for pain associated with a subluxation?

Answer 9

recurrent meningeal nerves

Question 10

What nerves reenters the IVF?

Answer 10

recurrent meningeal nerves

Question 11

Where do recurrent meningeal nerves go posteriorly?

Answer 11

-IVD
-PLL
-ligamentum flavum (connects lamina)
-periosteum of vertebral bodies (dural fat)
-epidural venous plexus

Question 12

Where do recurrent meningeal nerves go anteriorly?

Answer 12

spinal dura mater

Question 13

What does the medial branch of the dorsal rami innervate?

Answer 13

-deepest muscles of the back
-zygopophyseal joints and overlying skin
-spinous process and overlying skin
-interconnecting vertebral ligaments (interspinous ligament, supraspinous ligament, intertransverse ligament, and ligamentum flavum)

Question 14

What does the lateral branch of the dorsal rami innervate?

Answer 14

-erector spinae muscles and overlying skin
-splenius capitis and overlying skin

Question 15

Anterior/ventral rami of C1-T1 and L1-S4 form plexuses that supply muscles and skin of the lower and upper limbs. What plexuses are involved?

Answer 15

-cervical (C1-C5/C6)
-brachial (C5-T1)
-lumbar (L1-L4/L5)
-sacral (L4-S4)

Question 16

Anterior/ventral rami of T1-T12 form the intercostal nerves. What do the intercostal nerves supply?

Answer 16

-intercostal muscles
-muscles and skin of the anterolateral thorax and most of the abdominal wall

Question 17

Cervical nerves are named for vertebrae they exit ___________. Remaining nerves T1-Co1 are named for vertebrae they exit _________

Answer 17

above (EXCEPT C8), below

Question 18

T/F: a section of a cord is named for the spinal nerve that arises from it

Answer 18

true!