Rami

Question 1

The dorsal rami divide into 2 branches which provide ___ innervation to _____ muscles. Name the 2 branches

Answer 1

Motor, intrinsic back
Medial + Lateral branches

Question 2

The medial branch of the dorsal rami supply muscles at ___ levels; Which levels are also cutaneous (sensory to skin) to the upper back?

Answer 2

All levels
T6+^ also cutaneous to ^back

Question 3

The medial branch of the dorsal rami supply muscles at ___ levels; Which levels are also cutaneous (sensory to skin) to the lower back + medial gluteus region?

Answer 3

All levels
T6+down also cutaneous to low back + medial gluteus region

Question 4

Cutaneous nerves found in the ^back are ___ branches of the dorsal rami.
Cutaneous nerves found in the low back are ___ branches.

Answer 4

Medial branches
Lateral branches

Question 5

Name the 4 nerves that are exceptions to the dorsal rami branches, they don’t split into medial + lateral branches

Answer 5

dorsal rami of:
1st cervical nerve
4th + 5th sacral nerve
Coccygeal nerve

Question 6

Both branches of the cervical nerve supply ___ back muscles

Answer 6

Intrinsic

Question 7

Which branches of the cervical dorsal rami supply the intrinsic back?

Answer 7

Both

Question 8

The _____ branch of cervical dorsal rami become cutaneous at C2-4/5.
This means branches of _____ don’t have cutaneous twigs

Answer 8

Medial
C1, C6-8

Question 9

Which ramus is known as the Suboccipital Nerve?

Answer 9

C1 dorsal ramus

Question 10

Does the suboccipital nerve divide into med. + lat. branches?
What does this nerve supply?

Answer 10

No
Suboccipital triangle muscles

Question 11

Do C2 + C3 dorsal rami branch? Which is the largest of all dorsal rami?

Answer 11

Yes
C2

Question 12

This branch is known as the Greater Occipital nerve

Answer 12

Medial branch of C2

Question 13

The Greater Occipital Nerve is ___ to a large area of the back of the scalp and may be joined by a twig from the dorsal ramus of which segment?

Answer 13

Cutaneous
C3

Question 14

This dorsal rami branch is entirely muscular in its distribution and may be joined by a filament from C3

Answer 14

Lateral branch of C2

Question 15

What dorsal rami branch is known as the 3rd Occipital nerve?

Answer 15

C3 medial branch

Question 16

Where does the 3rd occipital nerve become cutaneous?

Answer 16

Base of occipital region

Question 17

The lateral branch of C3 is ____. May join the lat. branch of C2.

Answer 17

Purely muscular

Question 18

What thoracic dorsal rami divide into med. + lat. branches?
Lower thoracic dorsal rami may innervate areas of skin just above the iliac crests, this is because cutaneous branches:

Answer 18

All
Descend up to 4 rib spaces before becoming cutaneous

Question 19

Which branch becomes cutaneous varies from upper to lower Thoracic nerves; but as with cervical, one branch becomes cutaneous after ___. And the other will remain ___ ___.

Answer 19

Innervating muscle
Purely muscular

Question 20

From T1-T6, it is the same as the ___ region.
Medial branches supply + pass btwn:
Then pierce w/o innervating the:

Answer 20

Cervical (Medial branch cutaneous after innervating intrinsic muscles)
Semispinalis + multifidus
Rhomboids + traps

Question 21

From T1-T6, the lat. branch remains _____
Passing thru _____ + _____ to supply the remaining ___ muscles

Answer 21

Purely muscular
Longissimus + iliocostalis, Intrinsic

Question 22

From T7-T12, the situation is _____.
____ branch becomes cutaneous after innervating intrinsic muscles.
____ branch remains purely muscular

Answer 22

Reversed
Lateral branch
Medial branch

Question 23

Lumbar dorsal rami divide into branches and follow the pattern of the

Answer 23

Lower thoracic dorsal rami
(Lat. branch cutaneous after innervating intrinsic muscles)

Question 24

Lumbar medial branches are ___ and end in the _____ which they supply

Answer 24

Short, Multifidi

Question 25

Lumbar lateral branches supply the _____.
Which segments of the lumbar lat. branches become cutaneous?

Answer 25

Multifidi
L1,2,3

Question 26

What spinal nerve does not divide into branches? Is it C+M or Only M?

Answer 26

Suboccipital nerve, muscular (suboccipital ∆)

Question 27

Which medial branches are cutaneous + muscular?

Answer 27

C2-5
T1-6
(S4-Cx)

Question 28

Which medial branches are only muscular?

Answer 28

C6-8
T7-S3

Question 29

These segments don’t divide, but are cutaneous + muscular

Answer 29

S4-Cx

Question 30

Which dorsal nerves have special names, and are they the medial or lateral branches?

Answer 30

C1 = no branches; suboccipital nerve
C2 = med. branch; greater occipital nerve (C+M)
C3 = med. branch; 3rd occipital nerve (C+M)

Question 31

Which lateral branches are only muscular?

Answer 31

C2+3
C6-T6

Question 32

Which lateral branches are cutaneous + muscular?

Answer 32

T7-S3

Question 33

Ventral rami are much _____ than dorsal rami at most levels, appearing as a continuation of the spinal nerve

Answer 33

Larger

Question 34

Ventral rami supply motor to all _____ muscles including _____

Answer 34

Hypaxial, limbs

Question 35

Ventral rami cutaneously innervate most of the body except _____ + _____.

Answer 35

Post. Head + back

Question 36

The ventral rami Cervical Plexus =
And innervates:

Answer 36

C2-4
Neck, parts of head + shoulder

Question 37

The ventral rami Brachial plexus =
And innervates:

Answer 37

C5-T1
Pectoral girdle + upper limb

Question 38

The ventral rami Lumbosacral plexus =
And innervates:

Answer 38

L1-S4
Pelvic girdle + lower limb

Question 39

Define Dermatomes

Answer 39

Areas of skin innervated by cutaneous branches of a single spinal nerve

Question 40

For ventral rami dermatomes:
C5-T1 =
C5 =
C7 =
C8 =

Answer 40

Upper extremity
Thumb
Middle finger
Pinky

Question 41

For ventral rami dermatomes:
T4 =
T10 =

Answer 41

Nipple
Umbilicus

Question 42

For ventral rami dermatomes:
L1-S2 =
L1 =
L4 =
L5 =
S1 =

Answer 42

Lower extremity
Groin
Shin + medial foot
Lateral leg + top of foot
Pinky toe + bottom of foot