Exam 2: Spinal Cord Flashcards Preview

Anatomy A-215 > Exam 2: Spinal Cord > Flashcards

Flashcards in Exam 2: Spinal Cord Deck (24):
1

Spinal Cord

-rests within vertebral canal=vertebral foramina stacked on top of one another
-from foramen magnum to L1 vertebra

2

Spinal Cord Morphology

-oval in cross section
-enlarged in two areas
-cervical Enlargement: contains neurons that innervate upper limb
-lumbar enlargement: contains neurons that innervate lower limb

3

Conus Medullaris

-pointed end of spinal cord

4

Cauda Equina

-collection of nerve roots coming off of conus medullaris

5

Filum Terminale

-thin strand of pia matter that anchors conus medullaris to coccyx.

6

31 pairs of spinal nerves

-8 cervical (C1-C8)
-12 thoracic (T1-T12)
-5 lumbar (L1-L5)
-5 sacral (S1-S5)
-1 coccygeal (Co1)
-will exit vertebral canal through an intervertebral foramen adjacent to vertebrae of same name

7

Nerve

-typically a structure you can see with naked eye (MACROscopic)
-formed from many axonx bundled together in connective tissue wrappings (MICROscopic)

8

Epidural Space

-between dura mater and vertebra
-filed with fat and blod vessles
-most superficial

9

Dura Mater

-dnese connective tissue
-tough mother
-most superficial of maters.

10

Arachnoid mater

-thin spiderweb-like membrane
-deep to dura mater

11

Subarachnoid Space

-space between arachnoid and pia mater
-fluid with cerebrospinal fluid

12

Pia Matter

-thin layer of CT
-delicate mother
-adheres to spinal cord
-deepest

13

Central Canal

-space within gray matter of spinal cord
-lined with ependymal cells
-contains CSF

14

Gray Matter

-inner
-nerve cell bodies unmyelinated axons, glial cells, and interneurons
-4 subdivisions

15

Anterior (Ventral) Horns

-cell bodies of somatic motor neurons
-innervates skeletal muscle
-more pointed

16

Lateral Horns

-cell bodies of autonomic motor neurons
-prominent only in T1-L2 regions of spinal cord
-innervate cardiac muslce, smooth muscle and glands
-more rounded

17

Posterior (Dorsal) Horns

-interneurons and axons of sensory neurons

18

Gray Commisure

-unmyelinated axons crossing from one side to another
-contains central canal

19

White Matter

-outer
-bundles of unmyelinated axons
-Anterior funiculi
-Lateral funiculi
-Posterior funiculi
-each funiculus contains ascending (sensory) and descending (motor) spinal cord tracts

20

Spinal Cord Tracts

-bundles of axons that run in the white matter of the spinal cord
-2 main kinds

21

Ascending Tracts

-sensory axons
-travel from body to brain

22

Descending Tracts

-travel from brain to body

23

Naming of Tracts

-based on starting and ending point
-ex: corticospinal tract

24

Spinal Nerves

-each formed from
-anterior (ventral) root: axons of motor neurons
-posterior (dorsal) root: axons of sensory neurons
-posterior (dorsal) root ganglion: attached to posterior root, contains cell bodies of sensory neurons
-when anterior and posterior root unite, they form a spinal nerve
-contains both motor and sensory axons