2: Deep Back, Spinal Cord and Spinal Nerve Flashcards Preview

Gross Anatomy Unit 1 > 2: Deep Back, Spinal Cord and Spinal Nerve > Flashcards

Flashcards in 2: Deep Back, Spinal Cord and Spinal Nerve Deck (39):
1

function of deep back muscles

extend vertebral column, rotate (but not spinalis)

multifidus bends toward active muscle

2

erector spinae parts and function

spinalis, longissimus, iliocostalis

extend vertebrae. lateral 2 also bend column laterally and draw ribs down

3

multifidus

extend vertebral column and bend to active muscle (back bend; bring you back up after touching toes)

*extends entire spine length but we only saw in lumbar region

4

splenius capitius

extends head and neck with rotation to same side; like bandage

fibers go medial to lateral

from spinous process to mastoid process

5

what innervates the deep neck

DORSAL rami of spinal nerves

6

what is the connective tissue in deep neck area

ligament nuchae

7

semispinalis capitius

extends head and barely rotates (to OPPOSITE SIDE) because so close to midline, fibers straight up

8

semispinalis cervicus

deep to capitus; extends vertebral column and indirectly rotates head toward active muscle side; inserts at C2 spinous process

9

how did we see meninges

laminectomy; cut lamina (top of arch) and remove lamina + spinous processes

10

meninges layers

dura = tough outer
arachnoid = spider like middle
pia = tender surface coating of spinal cord

11

denticulate ligaments

pia mater extensions to anchor to inside of dura-- L1-L2

12

nuclei

collection of somas in CNS

13

ganglia

soma collection in PNS

14

nerve, tract

nerve is PNS, tract is CNS

15

where is CSF

in arachnoid mater

16

spinal cord segments

31

8C 12T 5L 5S 1Co

17

spinal cord enlargements; give rise to what

cervical: brachial plexus and lumbar: lumbar and sacral plexi

18

conus medullaris

bare end of spinal cord, nothing branching off

19

cauda equina

nerves. all the spinal cord branches that go down like horse tail below conus medullaris/filum terminale

20

filum terminale

pia mater extension once spinal cord is done, pull glove off finger, no nerve in it!

21

spinal nerves come out how

through intervertebral foramina, dorsal and ventral roots join as spinal nerves:
C1 above C1 til C8, which comes below C7 vertebra. then all come from below respective vertebra

22

5 landmarks of white matter

ventral median fissure
dorsal median sulcus
dorsolateral sulcus
ventrolateral sulcus
**upper thoracic and cervical: dorsal intermediate sulcus = boundary between faciculus gracilis and cuneatis (below, only gracilis)

23

dorsal vs ventral

dorsal = sensory
ventral = motor

24

gray vs white

gray matter is the H; cell bodies -- sends info to/from CNS

white matter is myelinated axons; sends info between brain and spinal cord (columns)

25

dorsal horn

soma that receive sensory input via dorsal roots of spinal nerves; dorsal root ganglia

26

ventral horn

motor neuron cell bodies project to muscle via ventral roots of spinal nerve

27

roots vs rami

roots come from rootlets from particular horn; roots are sensory or motor and then combine into nerve

rami are when the nerves split and are based on destination. dorsal go to deep back and ventral to otehr stuff

28

central canal of spinal cord

continuous with ventricles of brain, has CSF

29

lateral horn

sympathetic, only T1-L2

30

3 funiculi

dorsal = gracile and cuneate (ascending myelinated axons; sensory mechanoreceptor info)

lateral (descending myelinated axons; motor)

ventral (both up and down, cross midline)

31

cervical spinal cord

largest, kinda flat
cervical enlargement bc brachial plexus upper extremity innervation
-largest white matter columns
-large ventral horns (tell upper body what to do)

32

thoracic spinal cord

lateral horn
smaller H
cylindrical
above T6: dorsal column divides into facilculus cuneate and gracile and below only gracile

33

lumbar spinal cord

least white matter
cylindrical
enlargement for sacral adn lumbar plexus

34

ascending tracts

all 3, more in dorsal bc sensory info taken up to brain

35

descending tracts

ventral and lateral, more in ventral bc motor instruction taken to PNS

36

afferent

from periphery to CNS

37

efferent

from CNS to periphery

38

DRG

dorsal root cell bodies are before the dorsal horn; afferent signals

39

spinal reflex

afferent limb is sensory (soma in DRG); efferent limb is motor (soma in ventral horn)

afferent axon synapse on efferent cell body in monosynaptic (patellar reflex)

interneuron in multisynaptic (flexor reflex)

react before signal reaches CNS