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Reference Guide

Permachart - Marketing Reference Guide: Sacral Plexus, Lumbar Plexus, Sympathetic Ganglion

2 pages935 viewsFall 2015

Department
ANAT - Anatomy
Course Code
ANAT 14
Professor
All
Chapter
Permachart

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TM
permacharts
Spinal Cord
Spinal Cord
Figure 1: Spinal Cord
1
Cervical nerves (8 pairs)
2
Thoracic nerves (12 pairs)
3
Lumbar nerves (5 pairs)
4
Sacral nerves (5 pairs)
5
Coccygeal nerves (1 pair)
6
Cervical plexus
7
Brachial plexus
8
Spinal cord
9
Intercostal nerves
10
Conus medullaris
11
Cauda equina
12
Lumbar plexus
13
Sacral plexus
14
Sciatic nerve
Figure 2: Spinal Cord &
Sympathetic Trunk
1
Intervertebral disc
2
Vertebral body
3
White & gray Rami
communicantes
4
Spinal ganglion
5
Arachnoid
6
Gray matter
7
White matter
8
Filaments of ventral root
9
Pia mater
10
Dorsal primary ramus
11
Ventral primary ramus
(spinal nerve)
12
Dura mater
13
Sympathetic trunk
14
Sympathetic ganglion
Figure 3: Segmental
Innervation
• Each spinal nerve has both a
motor component (indicated in
red) and a sensory component
(indicated in blue) • The motor
fibers from the ventral root
innervate a specific myotome
(a region of skeletal muscle)
• The sensory fibers from the
dorsal root innervate a specific
dermatome (a region of skin)
1
Dermatome
2
Myotome
3
Spinal ganglion
4
Dorsal root
5
Filaments of dorsal root
6
Dorsal intermediate sulcus
7
Commissure of gray matter
8
Dorsal horn of gray matter
9
Lateral horn of gray matter
10
Ventral horn of gray matter
11
Ventral median fissure
12
White matter
13
Filaments of ventral root
14
Ventral root
Figure 4: Dermatomes
1
Cranial nerve V roots
(yellow area)
2
Cervical nerve roots
(blue area)
3
Thoracic nerve roots
(red area)
4
Lumbar nerve roots
(green area)
5
Sacral nerve roots
(purple area)
Figure 5: Spinal Cord Tracts
1
Septomarginal fasciculus
2
Interfascicular fasciculus
3
Lateral corticospinal tract
4
Rubrospinal tract
5
Lateral reticulospinal tract
6
Vestibulospinal tract
7
Ventral (medial)
reticulospinal tract
8
Tectospinal tract
9
Ventral corticospinal tract
10
Ventral spinothalamic tract
11
Spinotectal tract
12
Spinoolivary tract
13
Ventral spinocerebellar tract
14
Lateral spinothalamic tract &
spinoreticular tract
15
Dorsal spinocerebellar tract
16
Fasciculus cuneatus
17
Fasciculus gracilis
Figure 2: Spinal Cord & Sympathetic Trunk
4
5
3
2
1
14 13
1
• A dermatome is one
of several interlocking
areas of skin that are
each supplied by the
dorsal (sensory) root of
a single spinal nerve
• Because there is
considerable overlap of
adjoining dermatomes,
an area is not
anesthetized unless two
or more consecutive
dorsal roots have lost
function
• The spinal cord provides
conduction pathways to
and from the brain
Sensory impulses are
conducted up to the brain
via the ascending tracts of
the spinal cord Motor
impulses from the brain
are conducted down the
spinal cord via its
descending tracts Each
tract is composed of
bundles of axons All of
the axons within a tract
perform the same function
• There are two types of spinal cord tracts:
ascending (indicated in blue) and descending
(indicated in red) For clarity, each type of tract
is shown on only one half of the spinal cord
Anterior View Posterior View
2
3
4
5
1
6
5
4
11
10
9
12
13
3
2
7
8
9
11
10
12
13
14
1
14
7
8
2
3
4
5
6
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9
10
11
12
7
6
17
16
15
1
2
3
4
5
6
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12
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10
14
Figure 3: Segmental Innervation
Figure 5: Spinal Cord Tracts (Cross Section)
• The two components of the nervous
system are the central nervous system
(CNS) and the peripheral nervous
system (PNS) • The CNS is where
information is processed, and
includes the brain and spinal cord
• The PNS carries information
between the CNS and the
rest of the body, and
includes sensory and motor
divisions • The motor
neurons of the somatic
nervous system transmit
signals (contract or relax)
to skeletal muscle This
type of response is
considered voluntary,
though sometimes
skeletal muscle
movement is controlled
by automatic reactions
known as reflexes
• The autonomic
nervous system
(ANS) controls
smooth and cardiac
muscle (heartbeat)
and glandular
secretion, which
are involuntary
responses
Figure 4: Dermatomes
Figure 1: Spinal Cord (Posterior View)
2nd EDITION
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www.permacharts.com
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