Flashcards in Spinal Cord Lab Deck (46):
Spinal cord is ____
the continuation of the brainstem
Gray matter is
The interior portion of the cord
Gray matter has what 4 parts
1) Posterior horn
2) Lateral horn
3) Anterior horn
4) Gray commisure
Range of spinal cord
Foramen magnum - L2
5 Segments of the spinal cord
Where are the enlarged sections of the spinal cord?
1) Cervical enlargement (more gray matter for arm movement)
2) Lumbosacral enlargement (more gray matter for leg movement)
Cone shaped segment? Where is it located?
"Horse tail" after conus medullaris
What is the ligament that anchors the spinal cord vertically?
Location? What is it made of?
Conus medullaris to coccyx
What supports the spinal cord laterally?
2 indents of the spinal cord
1) Posterior median SULCUS (deeper but narrower)
2) Anterior median FISSURE (notice this isn't as deep but it is wider)
Order cross sections by largest to smallest diameter
Cell bodies of interneurons
Both SOMATIC and VISCERAL sensory nuclei
SOMATIC motor nuclei
Controls Skeletal muscles
AUTONOMIC motor nuclei
Controls CARDIAC and SMOOTH muscles and GLANDS
The gray matter surrounding the CENTRAL CANAL
What is in the Central Canal?
Cerebrospinal fluid (CSF)
What are the ascending and descending tracts of white matter called?
4 Parts of White matter
1) Anterior (ventral) Funiculi
2) Posterior (dorsal) Funiculi
3) Lateral Funiculi
4) Anterior white commissure
Where is the anterior white commissure located?
Between Anterior median fissure and the Gray commissure
What is between bone and dura mater? What is located there?
3 Types of Spinal Meninges (outermost to deepest)
1) Dura mater
2) Arachnoid mater
3) Pia mater
Where is a local anesthetic administered?
What is Dura mater made of?
DENSE Collegen Fibers
Where is general anesthetic administered?
In the CSF of the SUBARACHNOID SPACE because the CSF continues throughout the body
What 2 aspects of the spinal cord are made of Pia mater?
1) Denticulate ligament
2) Filum terminale
Which spinal meninges have blood vessels in them?
3 coverings of the Spinal Nerves (outermost to deepest)
1) Epineurium (loose areolar CT)
2) Perineurium (dense irregular CT)
3) Endoneurium (dense regular CT?)
How many Spinal Nerves
31 PAIRS of MIXED nerves
How many Cervical Nerves? Vertebrae #?
How many Thoracic Nerves? Vertebrae #?
How many Lumbar Nerves? Vertebrae #?
How many Sacral Nerves? Vertebrae #?
How many Coccygeal Nerves? Vertebrae #?
6 Parts of a Spinal Nerve
1) Dorsal root
2) Dorsal root ganglion
3) Ventral root
4) Dorsal Ramus
5) Ventral Ramus
6) Rami Communicantes
Has Dorsal root ganglion on it
SENSORY / Afferent
Dorsal Root Ganglion
Cell bodies of UNIPOLAR SENSORY neurons
MULTIPOLAR MOTOR / Efferent neurons
Posterior branch of nerve
Small and points back
Anterior branch of nerve
Bigger part of nerve and looks more lateral
Branch off rami for innervation of AUTONOMIC effectors
Example of Cervical Plexus
Example of Brachial Plexus
Ulnar nerve (funny bone)
C5 - T1
Innervates outside of lower arm
Example of Lumbar Plexus
Innervates skin and muscle of abdominopelvic region
Example of Sacral Plexus
Longest in body
Butt, perineum, back of thigh, leg and foot