Blood Of Spinal Cord Ganagn Flashcards
Anterior Spinal Artery
- The anterior spinal artery descends through the ____ from the skull
- it runs down in the anterior _____ of the spinal cord.
foramen magnum
median fissure
Posterior Spinal Arteries
-Each posterior spinal artery descends through the foramen magnum as two branches, which pass one____ and the other ____ the_____ roots of the____ nerves.
in front
behind
dorsal
spinal
Radicular Arteries
-The main source of blood to the spinal arteries is from the____ arteries
vertebral
Radicular arteries
- the blood from the vertebral arteries reaches only up to the_____ segments of the cord.
- Lower down, the spinal arteries receive blood through radicular arteries that reach the cord along the roots of spinal nerves.
- These radicular arteries arise from spinal branches of the _____,____,____ and_____ arteries
cervical
vertebral
intercostal
lumbar
sacral
Arteria Radicularis Magna
-Many of these radicular arteries are (small or large) and end by supplying the ____.
Small
nerve roots
Arteria Radicularis magna
A few of them, which are larger, join the _____ arteries and contribute blood to them.
- One of the radicular branches, usually from the ______ artery is very large and is called the arteria radicularis magna (artery of Adamkiewicz).
- This artery may be responsible for supplying blood to as much as the ___ of the spinal cord especially the ______ enlargement
Intrinsic Blood Supply
- The greater part of the cross-sectional area of the spinal cord, roughly the anterior two-thirds, is supplied by branches of the anterior spinal artery
- These branches enter the anterior median fissure (or sulcus) and are, therefore, called sulcal branches. Alternate sulcal branches pass to the right and left sides.
- Alternate sulcal branches pass to the right and left sides. They supply the anterior and lateral grey columns and the central grey matter. They also supply the anterior and lateral funiculi.
- T he rest (posterior one-third) of the spinal cord is supplied by the posterior spinal arteries
spinal
left 11th intercostal
lower two-thirds
lumbar
Position of arteria Radicularis magna is constant
T/F
F
Its position is variable.
VEINSSSS
- 6
- Two median longitudinal channels, one in the ______ called the anteromedian channel, and the other in the ______ called the posteromedian channel
- The paired anterolateral channels, one on either side, (anterior or posterior?) to the anterior nerve roots
- The paired posterolateral channels, one on either side (anterior or posterior?) to the posterior nerve roots
anterior median fissure
posteromedian sulcus
Posterior
Posterior
these venous channels of the spinal cord are interconnected by a plexus of veins that form a venous ____. The blood from these veins is drained into _____ veins that open into a venous plexus lying between the ____and the______ (_____venous plexus) and through it, into various ____ veins
vasocorona
radicular
dura mater
bony vertebral canal
internal vertebral
segmental
Watershed infarcts:
Blood from the vertebral arteries (through anterior and posterior spinal arteries) reaches only up to the _____ segments of the spinal cord. Arteria radicularis magna (artery of Adamkiewicz) supplies ___,____,and_____ segments of spinal cord. The segments ___to___ are therefore vulnerable to infarcts (watershed infarcts).
cervical
lower thoracic, lumbar and sacral
T1 to T4
Anterior spinal artery syndrome: Thrombosis in the anterior spinal artery produces a characteristic syndrome. The territory of supply includes the corticospinal tracts. This leads to an ___ motor neuron paralysis below the level of lesion.
upper
In anterior spinal syndrome :
DCML is affected
Spinothalamic tract is affected
T/F
F
T
Which is more prominent in the thoracic region
While or gray matter
White
Cervical spinal cord has massive posterior or anterior gray horn??
Posterior
___ and ____ nuclei are found at floor of 4th ventricle
Abducens
Medial vestibular
