Spinal Cord/Nerves

Question 1

How long is the spinal cord?

Answer 1

Roughly 16-18 Inches

Question 2

What shape is the spinal cord?

Answer 2

Cylindrical

Question 3

What are the two longitudinal depressions of the spinal cord?

Answer 3

Posterior and anterior median

Question 4

What is the tapering end of the spinal cord called?

Answer 4

Conus Medullaris

Question 5

How many pairs of spinal nerves are there

Answer 5

31 that contain both sensory and motor axons

Question 6

What is the connective tissue found within the spinal cord?

Answer 6

Endoneurium- around an axon
Perineurium- around a fascicle
Epineurium- around the whole nerve

Question 7

What are the four plexuses?

Answer 7

Cervical, brachial, lumbar, and sacral

Question 8

Phrenic Nerve

Answer 8

Innervates diaphragm through thoracic cavity

Question 9

Long Thoracic

Answer 9

Innervates serratus anterior

Question 10

Medial Pectoral

Answer 10

Innervates pectoralis major AND minor

Question 11

Lateral Pectoral

Answer 11

Innervates pectoralis major

Question 12

Axillary

Answer 12

Innervates deltoid and teres minor

Question 13

Radial

Answer 13

Innervates all muscles of posterior brachium, posterior antebrachium, and brachioradialis

Question 14

Median

Answer 14

Innervates all muscles of antebrachium except the medial half of flexor digitorum profundus and flexor carpi ulnaris

Question 15

Musculotanelis

Answer 15

Innervates all muscles in anterior brachium except brachioradialis

Question 16

Ulnar

Answer 16

Innervates medial half of flexor digitorum profundus and flexor carpi ulnaris

Question 17

Femoral

Answer 17

Innervates iliopsoas group, anterior thigh, and pectineus

Question 18

Obturator

Answer 18

Innervates all muscles in medial thigh except pectineus

Question 19

Superior Glutteal

Answer 19

Innervates gluteal group except gluteus maximus

Question 20

Inferior gluteal

Answer 20

Innervates Gluteus Maximus

Question 21

Sciatic Nerve

Answer 21

Innervates nothing (branches off into tibial nerve and common fibular nerve)

Question 22

Tibial Nerve

Answer 22

Innervates all posterior thigh except biceps femoris short head and posterior leg

Question 23

Common fibular

Answer 23

Innervates biceps femoris short head (branches into deep and superficial nerve)

Question 24

Deep fibular

Answer 24

Innervates anterior leg

Question 25

Superficial fibular

Answer 25

Innervates lateral leg

Question 26

Pendundle nerve

Answer 26

Innervates perineum, external anal sphincter, and external urethral sphincter

Question 27

What are the group of axons that project from the conus meduallris?

Answer 27

Cauda equina

Question 28

What is the thin strand of pia mater that travels in the cauda equina that anchors the conus medularis to the coccyx

Answer 28

Filum Terminale

Question 29

What enlargement accommodates extra nerves for upper appendages?

Answer 29

Cervical Enlargement

Question 30

What enlargement accommodates extra nerves for lower appendages?

Answer 30

Lumbar englargement

Question 31

What are the three meninges that cover the spinal cord?

Answer 31

Dura Mater, arachnoid mater, and pia mater (in order)

Question 32

What space is between the dura mater and the bony vertebrae?

Answer 32

Epidural space

Question 33

What are the two true spaces in the spinal cord

Answer 33

Epidural and subarachnoid

Question 34

What is the potential space in the spinal cord?

Answer 34

Subdural Space

Question 35

Which space is between the dura mater and the periosteum

Answer 35

Epidural Space

Question 36

Which mater fuses with the connective layers that surround the spinal nerves

Answer 36

Dura Mater

Question 37

Which mater adheres to the spinal cord?

Answer 37

Pia Mater

Question 38

What are the triangular extensions that anchor the spinal cord to the dura mater

Answer 38

Denticulate Ligaments

Question 39

What are the collections of spinal tracts in the white mater

Answer 39

Funiculi

Question 40

What joins the two anterior funiculi

Answer 40

White commissure

Question 41

What joins the two sides?

Answer 41

Grey commissure

Question 42

What houses the somas of somatic motor neurons?

Answer 42

Anterior Horns

Question 43

What contains the somas of automatic motor neurons from T12-L2?

Answer 43

Lateral Horns

Question 44

What contains the axons for sensory and interneurons?

Answer 44

Posterior Horns

Question 45

What is a continuation of the fourth ventricle?

Answer 45

Central Canal

Question 46

What innervates the deeps muscles and skin of the back?

Answer 46

Posterior Rami

Question 47

What innervates the anterior and lateral portions of the trunk and upper/lower appendages?

Answer 47

Anterior Ramus

Question 48

What forms the intercostal nerves?

Answer 48

T1-11 anterior rami

Question 49

What forms the subcostal nerve?

Answer 49

T12 anterior rami

Question 50

Which is the only anterior rami involved in a plexus?

Answer 50

T1

Question 51

What are the three components of a reflex?

Answer 51

1. Receptor in PNS 2. Communicates with the CNS 3. Action occurs in a peripheral effector