Functions of limbic system Limbic System Limbic system consists of cortical and subcortical areas which are structurally and functionally related to forebrain. It forms a ring of forebrain structures that surround the brainstem and are interconnected by intricate neural pathways. The components of the limbic system are hippocampus, amygdala and cingulate gyrus. It is concerned […]
Corpus striatum and Globus pallidus Corpus striatum Corpus striatum consists of CAUDATE NUCLEUS and PUTAMEN and initiate gross intentional movements of the body. It regulates the position of the body.It derives the name due to its straited appearance. Globus pallidus Most of the outflow of signals from the basal ganglia is channelled through globus pallidus en
Basal ganglia Basal ganglia is situated deep within the cerebral hemisphere as sub cortical gray matter with large masses of nerve cells. This acts as a part of the motor cortex in birds in which the motor cortex is poorly developed. It has corpus striatum (striated body), globus pallidus (pallidum) and the amygdala. It receives fibres
Corpus collosum Corpus collosum is a thick band consist of million of neuronal axons traversing and helping communication between two hemispheres. They are myelinated fibers.
Physiological functions of Cerebral cortex is to provides necessary neural connections and orders to skeletal muscles required for proper response based on emotion.
Central Nervous System or CNS Central Nervous System or CNS comprise the brain and the spinal cord. Brain consists of structures situated intra cranially and includes cerebrum, mid brain, pons, medulla, and cerebellum. Brain is divided into distinct regions, The fore brain(prosencephalon) which is subdivide into telencephalon [two cerebral hemisphere] and diencephalon or inter brain
Visceral receptors Mucosal receptors or Epithelial receptors Mucosal receptors or Epithelial receptors are located immediately below the mucosal epithelium. These are well distributed in the stomach and small intestine. They are rapidly adapting mechanoceptors, but are slowly adapting to chemical stimuli. Tension receptors Tension receptors are located within the stomach, small intestine of cats, sheep’s rumen
Golgi tendon organ Golgi tendon organ is located within the tendons of the skeletal muscles. It is present at the junction of muscle fiber and its collagenous tendon. As they are closely associated with the tendon, the stretch of the tendon causes depolarization of the receptor organ. Action potential is generated within the sensory fibers
Mechanism of action of Gamma motor neurons Excitation of these Gamma motor neurons ends up in contraction of intrafusal muscles. This in turn stretches the nuclear bag fibers and nuclear chain fibers. Sensory receptor of the muscle spindle in limited to these areas and can detect the tension upon these receptors. Stretch initiates depolarization in
Muscle spindle organ Muscle spindle organ are located within the belly of the skeletal muscles. They are in the shape of a spindle and are made up of specialized striated muscle fibres which are known as Intrafusal fibers. These intrafusal fibers are placed within the connective tissue capsule attached to the perimysium of the skeletal
