POWER POINT PRESENTATION

POWER POINT PRESENTATION

WELCOME 

                                                                              NAME        :  NASHIDA.M.BASHEER
                                                                             REG.NO     :  13367010

                                                                             OPTION      :NATURAL SCIENCE
                                                                            CONCEPT   :  PARTS OF THE BRAIN
                                                                            TOPIC         :BRAIN
                                                                           JAMEELA BEEVI MEMORIAL CENTRE FOR TEACHER EDUCATION
                                                                                       KAYAMKULAM

                      BRAIN

Brain is the central information processing organ of  our body, and acts as the “command and control system”.

•The human brain is well protected inside the cranium. The brain is covered by three layers called meninges.

•It protects the brain provides nutrients  and oxygen to brain tissues through their capillaries. Cerebro spinal fluid (csf) is filled the cavity between layers of meninges

  PARTS OF THE HUMAN BRAIN

     STrUCTURE OF HUMAN BRAIN

   v An adult human brain weighs about 1350 gm of their body weight

     v It attains its full size at the age of 6 years

   v It is well protected in the cranial cavity

   v In most part of the brain, the grey matter forms the surface while the white matter is located deep in the brain.

   v The brain has three primary divisions; fore brain, mid brain and hind brain.

                             1 . Fore brain

v The anterior most part of the brain is called the fore brain.

v The main parts of the fore brain are the cerebrum, thalamus and hypothalamus

a).CEREBRUM

v  Cerebrum is the largest part of the brain.

v There are convolutions on the surface of the cerebrum.

v A deep cleft called longitudinal fissure divides the entire cerebrum into two large hemispheres called cerebral hemispheres.

v The two cerebral hemispheres are held together and connected b y a curved ,thick band of nerve fibres, known as the corpus callosum.

v Cerebral cortex is the outer layer of the cerebrum.

v 

              THALAMUS AND HYPOTHALAMUS

a).THALAMUS

v The cerebrum wraps around a structure called thalamus

v It is a major co-ordinating centre for sensory and motor signals.

b).HYPOTHALAMUS

v Another very important part of the brain called hypothalamus lies at the base of the thalamus.

v It is relatively small with just 4 gm in weight.

v It is highly vascularised.

v It contains number of nerve centres which control body temperature, urge for eating and drinking.

v It also contains several group of  neurosecretory cells

 

                                      2.Mid brain

v It is located between the thalamus or hypothalamus of the fore brain and pons of the hind.

v The mid brain of human consists of 2 parts corpora quadrigemina and crura cerebri

v Four lobes of round masses (swellings) of neural tissue found on the dorsal region of the mid brain are called corpora quadrigemina

v The 2 bundles of nerve fibres found on the ventral side of the mid brain are called crura cerebri

v Mid brain and hind brain from the brain stem

                          3.Hind brain 

vThe posterior part of the brain is called hind brain

vIt consist of 3 regions-pons,cerebellum and medulla

va)PONS VEROLI

vIt forms the floor of the brain stem

vPons varoli is a bridge between two cerebellar hemispheres.

vIt is chiefly concerd with co-ordination of activities of eye and ear.

vIt relays information between cerebrum and cerebellum

b).CEREBELLUM

vIt is the second largest part of the brain.

vIt is formed of two small lobes lying on the dorsal side of the hind brain.

vLike the cerebrum, the cerebellum has and outer cortex

c)MEDULLA OBLONGATA

vThe most posterior part of the brain is the medulla oblongata.

vIt contains several centers which regulate respiration, heart-beat,circulation and other cardio-vascular activities.

vInjury to medulla leads to sudden death

THANK YOU