2. Anterior and posterior circulation
►
Anterior circulation: common carotid and its
ramifications including ICA, MCA and ACA
►
Posterior Circulation: refers to the vertebral
and basilar arteries and their branches.
13. Circle of Willis
►
The circle of Willis is the joining area of several arteries
at the bottom side of the brain
►
1, anterior circulation, which is composed the MCA,
ACA, and the anterior communicating artery which
connects the two anterior cerebral arteries.
►
2, the posterior circulation, which is composed of the
posterior cerebral arteries
►
3, the posterior communicating artery, which connects
the middle cerebral with the posterior cerebral arteries,
and forming a true circle.
14. Circle of Willis
►
Formed by these arteries:
Internal carotid A.
Posterior cerebral A.
Posterior communicating A.
Middle cerebral A.
Anterior cerebral A.
Anterior communicating A.
►
Links the internal
carotid and vertebral
basilar arterial systems.
15. Middle Cerebral Artery
►
The MCA, the largest
cerebral artery, arises
from the trifurcation of
the internal carotid
arteries of the Circle of
Willis, and comprises
of 4 parts: M1, M2,
M3, and M4
24. ACA Branches
►
Medial striate atery(recurrent artery of Heubner)
(supplies the lower part of the anterior limb and genu of the
internal capsule).
►
Orbitalfrontal branches
►
Frontopolar artery
►
Callosomarginal artery
►
Pericallosal artery
30. Blood Supply of the Brain Stem
►
The brain stem receives
its blood supply
exclusively from the
posterior circulation.
31. Vascular supply of the medulla
►
The medulla is supplied by the vertebral
arteries and their branches. its blood
supply further subdivided into two
groups,
►
paramedian bulbar arteries are
penetrating branches mainly from the
vertebral artery that supply the midline
structures of the medulla. at the lower
medulla branches from the anterior
spinal artery also contribute to this
paramedian zone.
►
the lateral bulbar arteries are
branches of the vertebral artery or the
PICA which supply the lateral portion of
the medulla.
32. Vascular supply of the Pons
►
The basilar artery is the principle
supplier of the Pons. It gives off three
types of branches.
►
Paramedian arteries supply the
medial basal Pons, including the
pontine nuclei, corticospinal fibers
and medial lemniscus.
►
The short circumferential
arteries supply the lateral aspect of
the Pons and the middle and superior
cerebellar peduncles.
►
The long circumferential
arteries together with branches from
the AICA and superior cerebellar
artery supply the pontine tegmentum
and the dorsolateral quadrant of the
Pons.
33. Vascular supply of the midbrain
►
Branches of the SCA, PCA, P
com, and the anterior choroidal
artery.
►
Branches of these arteries can
be grouped into paramedian
arteries, which supply the
midline structures, and the long
and short circumferential
arteries, which supply the
dorsal and lateral midbrain.
34. Blood Supply of the Cerebellum
►
The cerebellum receives its blood supply
from the three cerebellar vessels:
►
1, posterior inferior cerebellar artery (PICA)
off of the vertebrals. supplies posteroinferior surface of
cerebellar hemisphere , ipsilateral part of inferior vermis,
and lateral medullary areas.
►
2, anterior inferior cerebellar artery (AICA)
the first branch of the basilar. supplies part of the pons and the
anterior inferior surface and underlying white matter of
cerebellum
►
3, Superior cerebellar artery (SCA) the last
brache off of the basilar. supplies part of the rostral pons and
superior region of the cerebellum
39. Spinal Cord Blood Supply
►
The two Posterior Spinal Arteries arise from the
vertebrals and supply the posterior 1/3 of the cord.
►
The Anterior Spinal Artery, formed from a Y-
shaped union of a branch from each vertebral
artery and supplies the anterior 2/3 of the cord.
►
The Radicular arteries enter every intervertebral
foramen and supply the spinal nerve roots. The
radiculospinal branches arise from the vertebral
arteries and the aorta. Of these branches, the
largest is the great anterior radicular artery of
Adamkiewicz (radicularis magna), which supplies
the lower thoracic and upper lumbar parts of the
cord
40. Spinal Cord Blood Supply
Anterior spinal
arteries :supply /
anterior aspect of
spinal cord
Posterior spinal
arteries : supply /
posterior aspect of
spinal cord
Anterior and
posterior radicular
arteries are form
arterial vasocorona
