Bloodsupply Of The Brain

Question 1

ARTERIES

Answer 1

1. Circulus Arteriosus CEREBRI
   (Willis arterial circle)
   - Surround hemispheres + Chiasma opticum
2. A. CHOROIDEA rostralis
   - Plexus Choroideus
3. A. Cerebri rostrale
   Ex A. carotis interna
   = Rostral part of the Circulus

I: A. Meninges rostr (fe)
- Dura mater ENCEPHALI

II: a. Ethmoidalis int
- Ramifies from Foss Ethmoidalis (rostr)

III: A.communicans rostralis - Chiasma opticus
Ex a. CEREBRI rostralis!
- RR. Cortecales —> Cortex cerebri
- Rr Centrales —> Brain, deep

4. A. CEREBRI media —> circulus —> Lobus piriformis
   - Rr. corticales —> Cortex
   - Rr. Centralis —> deep Brain
   - Rr. Striati —> Corpus striatum
5. A.communicates caudalis = caud. Part of CIRCULUS
   Ex. Carotis INT!
   + A.basilaris
6. A.Cerebri caudalis (*2 EQ)
   - Rr. choroidei caud —> plexus choroideus
   - Rr. Corticales —> Cortex
   - Rr. Centrales —> Brain
7. A. Basilaris = Ventral to RHOMBENCEPHALON
8. A.cerebelli rostralis —> Cerebellum
   ex. A. Basilaris
9. A. Cerebelli caudalis!

Question 2

Arteries Ventral view

Answer 2

A. Meninges rostralis (fe)
Chiasma opticus
A.opthalmica interna 
A.Cerebri media
A. Choroidea rostralis
A. Cerebri rostralis 
Circulus arteriosus cerebrii
A. Cerebri caudalis

A. Cerebelli rostralis
Rami ad pontem
A.Cerebelli caudalis 
A. basilaris
A. vertebralis

Question 3

VENOUS SYSTEM

Answer 3

= SINUS DURA MATRIS

DORSAL
1. SINUS saggitalis dorsalis
—> FALX Cerebri (dura matter ENCEPHALI)

2. SINUS rectus —> FALX Cerebri
   Ex Cerebri magna
3. SINUS transversus
   —> in Tentorium Cerebelli
4. SINUS temporalis Ø:EQ!!
   —> To Ventral VENOUS system
   Ex SINUS transversus

VENTRAL
1. SINUS cavernosus —> lat to hypothalamus

2. SINUS basilaris
   Ex plexus vertebralis interna Ventralis
3. SINUS petrosus Ventralis
   Ex. SINUS cavernosum (caud)
4. SINUS intercavernosi
   —> Rostral and caudal to hypothalamus
   - Connects with SINUS Cavernosi

Question 4

Blood Vessels of the Brain

Answer 4

Horse and dog: mainly from Paired.
A. CAROTICA INTERNA

Pig and Cat: A.carotica int closes shortly after birth —> Bloodsupply provided by branches of the MAXILLARY Artery
—> branches forming complicated a. network at the base of the Brain forming:
Rostral and caudal EPIDURAL RETIA MIRABILIA
—> Unites in CEREBRAL CAROTID A.

A.CAROTICA INTERNA in horse and dog
\+ A. CAROTIS CEREBRII in other 
=> Penetrate dura matter at DIAPHRAGMA SELLAE —> forming a ring: CIRCLE of WILLIS
- only compleeted in the DOG
- rorstrallt open in other

The arterial ring is joined CAUDALLY by:
A. BASILARIS and Vertebral arteries
OX: Vertebral a contributes bigger portion to CIRCLE of WILLIS.

CIRCLE + BASiLLaR A. Mainbranches:

1. A. CEREBRI ROSTRALIS
2. A. CEREBRI MEDIA
3. A. CEREBRI CAUDALIS
4. A. CEREBELLI ROSTRALIS
5. A. CEREBELLI CAUDALIS