Cerebral CirculationCerebral Circulation

Srilata 3Udita Goyal 14Bhavesh Lokhande 25Rohan Rane 36Vivek Varade 47

Anatomy of BrainAnatomy of Brain

Frontal LobeFrontal Lobe

Blood supply - ACA and MCA

Major functions:◦ personality, behaviour◦ judgement/problem solving◦ micturation◦ expressive speech – articulation and

speech production ◦ concentration, reasoning

Parietal LobeParietal Lobe

Blood supply – ACA, MCA and PCA

Major functions:◦ sensory function◦ body part awareness◦ visual spatial information

Temporal LobeTemporal Lobe

Blood supply - MCA and PCA

Major Functions:◦ understanding speech -Wernickes◦ visual, olfactory and auditory perception◦ learning, memory, emotional affect

Occipital LobeOccipital Lobe

Blood supply - MCA,PCA

Major Functions:◦ primary visual area◦ some visual reflexes◦ involuntary smooth eye movements◦ recognition & identification of objects

CerebellumCerebellum

Blood supply -Vertebrobasilar

Major Functions:

◦ control of fine motor movement

◦ coordinates muscle groups

◦ maintains balance, equilibrium

Brain StemBrain Stem

Blood supply - PCA & Vertebrobasilar

Major divisions - midbrain, pons, medulla

Serves as a pathway

Reticular Activating System

Circulatory system in Circulatory system in BrainBrain The brain receives its blood supply from the

heart by way of the aortic arch

Systems :-

D.Carotid Arterial System Vertebrobasilar SystemS Collateral blood supply of the brain Venous drainage

A. A. Carotid Arterial System Carotid Arterial System

1. Common Carotid artery (CCA)

2. External Carotid artery (ECA)

3. Internal Carotid artery (ICA)

B. B. Vertebrobasilar SystemVertebrobasilar System

1. Vertebral artery

2. Basilar artery

3. Posterior cerebral artery (PCA)

C. C. Collateral blood supply of the Collateral blood supply of the brainbrain

2.Extra cranial connections

4. Intracranial connections

D. D. Venous drainageVenous drainage

Physiology of the cerebral Physiology of the cerebral circulation circulation

Blood Brain Barrier

Regulation of cerebral blood flow◦ Autoregulation◦ Effect of Gases and Ions

Factors controlling cerebral Factors controlling cerebral circulationcirculation

Intracranial pressure Viscosity of blood Diameter of cerebral blood vessels CO2 tension

O2 lack/excess Adrenalin/Noradrenalin Drugs : Papaverine, Ethyl alcohol,

Caffeine

DiseasesDiseases

Stroke

Transient Ischemic Attack

Cerebral Arteriosclerosis

Cerebral aneurysm

Cerebral arteriovenous malformation

ReferencesReferences� Human Physiology by Dr.

C.C.Chatterjee Waugh A,Granta A. Anatomy and

Physiology in health and illness.10th edition

a Principles of Anatomy and Physiology by Gerard J. Tortora and Bryan H. Derrickson

a Guyton AC,Hall JE. Text book of medical physology.11th edition, Philadelphia.