Chap 16 Flashcards Preview

Human Anatomy Exam 3 > Chap 16 > Flashcards

Flashcards in Chap 16 Deck (26):
1

Spinal cord ends...

approx. L1 vertebrae

2

Number of vertebrae/ section

8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal

3

spinal cord meninges

vertebra, epidural space, dura mater, arachnoid mater subarachnoid space, pia mater

4

anterior horn

motor neurons

5

lateral horns

t1-L2 autonomic motor
sympathetic motor neurons

6

posterior horns

sensory neurons

7

conus medullaris

cone shaped, tapering at end of the spinal cord (L1)

8

cauda equina

"horse tail" axons of spinal nerves projecting inferiorly from spinal cord to lumbar and sacral levels

9

filum terminale

strand of pia mater extending from the conus medullaris (white)

10

cervical enlargement:

neurons ot upper limbs

11

lumbsacral enlargement

nuerons to lower limbs

12

anterior median fissure

motor

13

posterior median sulcus

sensory

14

anterior rootlets

cmbine to form anterior root which contains anterior motor axons only

15

posterior rootlets

combine to form posterior root and contain only sensory axons.

16

Dermatome:

a segment of skin supplied by a single spinal nerve
C3 collar
T4 nipple
T10 belly button

17

Nerve plexuses

Cervical Brachial Lumbar Sacral

18

cervical plexuse

innervates anterior neck muscles and diaphragm

19

brachial plexuse

innervates pectoral girdles and upper limbs

20

lumbar plexuse

innervates pelvic girdles, thighs

21

sacral plexuse

innervates lower extremities

22

Reflexes

rapid, automatic, involuntary reactions of muscles or glands to a stimulus

23

Ipsilateral reflex

both receptor and effector organs on same side of spinal cord

24

Contraloateral reflex

sensory receptors and effector organs on opposite body side.

25

Monosynaptic reflex

simplest reflex ex: patellar reflex

26

polysynaptic reflex

involves a number of synpases and interneurons (ex. Pain withdrawal)