lab 21: spinal cord, nerves, + reflexes

1

1

nerve

2

blood vessels

3

fascicle

4

epineurium

5

perineurium

6

endoneurium

1

cervical enlargement

2

lumbar enlargement

3

cauda equina

4

conus medullaris

5

filum terminale

identify this nerve

median nerve

B

obturator nerve

A

femoral nerve

C

sciatic nerve

1

posterior root ganglion

2

posterior rootlets

3

posterior median sulcus

4

posterior horn

5

anterior horn

6

anterior median fissure

K

myelin sheath

J

perineurium

I

blood vessels

H

nerve fascicles

G

perineurium

F

epineurium

E

axon and surrounding myelin

D

fascicle

C

epineurium

B

endoneurium

A

axon

fanning of the toes up is the

babinski sign

babinksi sign (plantar reflex) is the abnormal response that helps reveal..

damage to the motor tracts of the spinal cord.

reflex

an involuntary motor response

reaction

a planned motor response

reflex arc

nerve pathway for a reflex

stimulus

activates a sensory receptor

sensory receptor

the first step in a reflex arc

sensory neuron

also called an afferent neuron

integrating center

found only in gray matter of CNS

interneuron

neuron found only in polysynaptic reflexes

motor neuron

also called an efferent neuron

effector organ

carries out a motor response

monosynaptic reflex

has only one synapse

polysynaptic reflex

always has one or more interneurons

somatic reflex

effector organ is skeletal muscle

autonomic reflex

effector organ may be a gland

cranial reflex

integrating center is the brain

spinal reflex

integrating center is the spinal cord

patellar reflex

also called the knee jerk reflex

plantar reflex

can reveal babinski’s sign

A

c1 spinal nerve

B

c8 spinal nerve

C

phrenic nerve

D

median nerve

E

ulnar nerve

F

radial nerve

G

musculocutaneous nerve

H

axillary nerve

A

femoral nerve

B

L1

C

L3

D

obturator nerve

E

sciatic nerve

F

common fibular nerve

G

tibial nerve

A

cervical plexus

B

brachial plexus

C

lumbar plexus

D

sacral plaexus

A

cervical enlargement

B

spinal cord proper

C

filum terminale

D

cauda equina

E

conus medullaris

F

lumbar enlargement

A

posterior rootlets

B

posterior root

C

pia mater

D

arachnoid mater

E

dura mater

F

anterior ramus

G

posterior ramus

H

spinal nerve

I

anterior root

J

anterior rootlets

A

spinous process of vertebra

B

epidural space

C

spinal cord

D

body or vertebra

E

pia mater

F

spinal nerve

G

subarachnoid space

H

arachnoid mater

I

dura mater

A

posterior (dorsal) funiculus

B

central canal

C

anterior (ventral) funiculus

D

anterior median fissure