Week 3: Spinal Cord/Spinal Nerves Flashcards
The gracile, cuneate fasciculi and spinothalamic tract are all:
a. Descending tracts
b. Crossed
c. Uncrossed
d. Ascending tracts
d. Ascending tracts
True/false: the spinal cord is shorter than the spinal canal.
TRUE
the spinal cord is shorter than the spinal canal.
What does the Bell-Magendie law state?
Afferent sensory fibers enter the spinal cord through the dorsal roots of spinal nerves; motor and efferent fibers leave by way of the ventral roots
List the four structures/components protecting the spinal cord.
- The vertebrae
- Attaching ligaments
- The meninges and
- Cerebrospinal fluid , CSF (cushioning effect)
What is the Denticulate Ligament made out of?
pia–arachnoid
tissue (also called PACHYMENINGES)
The cuneate fasciculi, vestibulospinal tract and gracile are all:
a. Descending tracts
b. Crossed
c. Uncrossed
d. Ascending tracts
c. Uncrossed
This is the space that exists
between the dura mater and
the wall of the spinal canal.
a. Subarachnoid space
b. Epidural space
c. Denticulate Ligament
e. CSF
b. Epidural space
• It is filled with fatty tissue
some protection
• It contains a venous plexus.
What is the innermost meningeal layer?
Pia mater
The spinal cord has ___
external segments which are
demonstrated by the presence of ___ pairs of spinal nerves.
31, 31
The spinal cord ends at the _______, which tapers abruptly into a slender filament called the_____.
a. cervical enlargement, e lumbosacral enlargement
b. dorsal forniculus, dorsolateral fasciculus
c. conus medullaris, filum
terminale
d. cauda equina, coccygeal nerve
c. conus medullaris, filum
terminale.
The nerve supply of the upper limbs comes from:
a. thoracic spinal nerves
b. lumbosacral plexuses
c. cauda equina
d. brachial plexuses
d. brachial plexuses
The surface of the spinal cord is marked by two longitudinal furrows. What are they?
The deep ventral (anterior) median fissure The dorsal (posterior) median sulcus (a shallow midline furrow).
The lateral horn of spinal grey matter exists only in:
a. the thoracic and upper lumbar segments
b. the cervical enlargement
c. the lumbosacral roots
d. the sacral and mid-sacral segments
a. the thoracic and upper lumbar segments
List the three funiculi or “columns” of the spinal cord white matter.
– The dorsal funiculus
– The lateral funiculus
– The ventral funiculus
Which of the following is NOT true regarding the lateral corticospinal tract?
a. It is a descending tract
b. It decussates
c. It consists of axons of neurons in the cortex of the frontal and parietal lobes
d. It is in the ventrolateral fasciculus
e. fibers destined for the lowest levels of the spinal cord are the most laterally placed.
d. It is in the ventrolateral fasciculus
Correction: It is in the Dorsolateral Fasciculus
Two regional enlargements exist in the spinal cord. What are they?
The Cervical enlargement includes segments
C4 to T1
The Lumbosacral enlargement includes the
segments L2 to S3
The fasciculus gracilis and fasciculus cuneatus comprise the:
A. Dorsal Forniculus
B. Lateral Foniculus
C. Ventral Foniculus
A. Dorsal Forniculus
What suspends the spinal cord in the dural sheath?
Denticulate Ligament