Presentation on theme: "Lizette Torres Mina Yanny Per. 3 Brain. Function of the Brain The control network for the body’s functions and abilities It is in charge of things your."— Presentation transcript:
Lizette Torres Mina Yanny Per. 3 Brain
Function of the Brain The control network for the body’s functions and abilities It is in charge of things your body needs to stay alive Tells your body what to do
Layers of the Meninges The Dura Mater The Arachnoid Mater The Pia Mater Bone is situated over the meninges followed by periosteum and skin
Dura Mater ● Outermost, toughest, and most fibrous of the three membranes ● Covers the brain and spinal cord ●Responsible for keeping in the cerebrospinal fluid ●Has two layers ○The superficial: serves as the skull’s inner periosteum ○The deep layer called the meningeal layer which is the actual dura mater.
Dura Mater Cont. Opens at times into sinus cavities, which are located around the skull. Home to meningeal veins. It envelops arachnoid mater Carries blood from the brain to the heart.
The Arachnoid Mater Middle Layer of the meninges so it is between the dura mater and pia mater Envelops the brain Sends processes into the longitudinal and transverse fissure Surrounds nerves Forms tubular sheaths for nerves
Arachnoid Mater cont.
The Pia Mater Innermost layer of the meninges, closest to brain Composed of fibrous tissue Covered on its outer surface by flat cells thought to be impermeable to fluid. Pierced by blood vessels that travel to brain and spinal cord Protects central nervous system by containing the cerebrospinal fluid
The Brain and its sections ●The brain weighs three pounds ●Has a texture as jelly ●The main parts of the brain are the cerebrum, cerebellum, brainstem, frontal lobe, parietal lobe, occipital lobe, and temporal lobe ●Difference from left and right ●The Neuron forest
The Brains Parts
Brain and sections cont. Cerebrum ●Largest part of the brain ●Associated with higher brain function such as thought and action ●For remembering, problem solving, thinking, feeling and movement ●Has outer layer called cortex, which is the brains wrinkly surface
Brain and sections cont. Cerebellum ●Receives information from sensory systems, spinal cord, and and other parts of the brain ●Regulates motor movements Brainstem ●Regulates heart rate, breathing, sleeping, and eating. ●Leads to as the spinal cord
Brain and sections cont. Frontal Lobe Front part of brain involved in reasoning, planning, parts of speech, movement, emotions, and problem solving Parietal Lobe involved in movement, orientation, recognition, perception of stimuli Occipital Lobe involved in visual processing
Brain and Sections cont. Temporal Lobe involved with perception and recognition of auditory stimuli, memory, and speech Left & Right of brain Left: controls movement on the body’s right side and has logic abilities Right: controls movement on the body’s left side and more for creativity Neuron Forest Where the work of the brain goes on in individual cells Signals that form memories and thoughts move through a nerve cell as an electrical charge.
Brain Development Ectoderm Neural Plate Prosencephalon Mesencephalon Rhombencephalon Telencephalon Diencephalon Mesencephalon Metencephalon Myelencephalon Cerebral cortex Retina of the eye Midbrain basal nuclei Thalamus Superior colliculus Pons Medulla Hypothalamus inferior colliculus Cerebellum
Reflexes Reflexes are an automatic response to a stimulus maintain homeostasis 2 types –Spinal reflexes –brain reflexes
Spinal Reflex response is mediated by neurons in the spinal cord Action occurs without the awareness of brain –ex. Kneejerk
Brain Reflexes Reflexes mediated by the brainstem brain receives information and generates a response ex. movements of the eyes while reading this sentence
Sensory Neurons Nerve cells that detect changes and send information it may activate a motor neuron or another sensory one Afferent neurons
Motor Nerves Efferent They carry signals from the spinal cords to muscles They produce movements
interneurons They create neural circuits to enable the communication between motor neurons or sensory neurons and the central nervous system
Cranial Nerves ●There are 12 pairs of cranial nerves ●They emerge directly from the brain and the brain stem. ●They exchange information between the brain and the body parts ○some bring information from sense organs and others control muscles
Olfactory nerve First cranial nerve A sensory nerve It carries the sensory information for smell Capable of regeneration
Optic Nerve a sensory motor Transmits visual information from the retina to the brain ex. brightness perception, contrast
Oculomotor Nerve It is a motor nerve It controls most of the eye’s movements –ex. maintaining the opening of an eye lid and pupil constriction
Trochlear nerve It is a motor nerve It innervates a single muscle the superior oblique muscle of the eye It has the smallest number of axons
Trigeminal nerve it is a sensory and a motor nerve –sensation in the face –chewing and biting divided in 3 branches –ophthalmic, maxillary and mandibular
Abducens nerve somatic efferent nerve motor nerve controls the movement of the lateral rectus muscle of the eye
Facial nerve both motor and sensory nerves It emerges from the brain stem Responsible for facial expressions it also supplies sensation information –taste sensation
vestibulocochlear nerve It is a sensory nerve it transmits sound and equilibrium information from inner ear to brain it consists of cochlear nerve and vestibular nerve
glossopharyngeal nerve both sensory and motor nerve –carries afferent sensory and efferent motor information several functions –receives general sensory fibers –receives special sensory fibers –receives visceral sensory fibers
Vagus nerve both motor and sensory nerve it supplies motor parasympathetic fibers to all organs except adrenal glands it controls few skeletal muscles
Accessory nerve motor nerve provides information about the spinal cord, trapezius and other surrounding muscles. provides muscle movement of the shoulders and surrounding neck.
Hypoglossal nerve it is a motor nerve innervates movement of the tongue –controls movement required for speech, swallowing and food manipulation.
Spinal Nerves 31 pairs of spinal nerves organized and divided into 4 regions –Cervical –Thoracic –Lumbar –Sacral provide communication between body parts and cns they split into 3-4 branches –Dorsal branch –Ventral branch –Visceral branch –Meningeal branch 2 roots –posterior –anterior
Cervical nerves 8 pairs –C1 - C8 emerge from corresponding vertebrae they innervate the sternohyoid, sternothyroid and omohyoid muscles
Thoracic nerves 12 pairs –T1 - T12 originate from corresponding vertebra they communicate with parts of chest or thorax and abdomen
Lumbar nerves 5 pairs –L1 - L5 emerge from lumbar vertebrae they supply many muscles –ex. Gluteus medius muscle and gluteus minimus
Sacral nerves 5 pairs –S1 - S5 start inside the vertebral column and exit the sacrum they supply the hip, thigh and foot
Works Cited Patricia Anne Kinser, “Brain Structures and Their Functions.” Serendip Studio. Paul Grobstein, 5 September Web. 21 April Alzheimer’s Association, “3 Main Parts of the Brain.” Alzheimer’s Association Web. 19 April “Arachnoid Trabeculae.” Encyclopedia Britannica. 9 September Web. 19 April, Michelle Watnick, ”Nervous System II.” Hole’s Human Anatomy and Physiology. Fran Schreiber, Book. 18 April 2015.