1 / 8

Nervous System

The nervous system is a complex network crucial for communication within the body. It comprises the central nervous system (CNS), including the brain and spinal cord, and the peripheral nervous system (PNS), which connects the CNS to the rest of the body via cranial and spinal nerves. The PNS has sensory (afferent) and motor (efferent) divisions. Reflex arcs facilitate rapid responses to stimuli, maintaining homeostasis. This overview highlights the structure, functionality, and significance of various components of the nervous system.

olga-curry
Download Presentation

Nervous System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nervous System …the brain…

  2. Nervous System …the brain…

  3. Nervous System …the brain…

  4. Nervous System …the brain…

  5. Nervous System Peripheral Nervous System

  6. Nerve fibres carrying msgs to/from CNS & groups of nerve cell bodies (ganglion) Nervous System Cranial Nerves: 12 pairs of nerves arising from brain (eg optic nerve, auditory nerve) most mixed, some single. Spinal Nerves: 31 pairs of mixed nerves each joined to the spinal cord by two roots. Peripheral Nervous System 1. Ventral Root: axons of motor neurons with cell bodies in grey matter of spinal cord 2. Dorsal Root: axons of sensory neurons with cell bodies in small swelling on dorsal root (dorsal root ganglion)

  7. Divisions: Afferent (sensory) Division: Nervous System Efferent (motor) Division: Somatic (voluntary) Division: Autonomic (involuntary) Division: Peripheral Nervous System Sympathetic (preparation) Division: Parasympathetic (maintenance) Division:

  8. Reflex is a rapid, automatic response to a change in the internal / external environment (homeostasis) Nervous System Reflex Arc or Spinal reflex arc: Receptor: Sensory Neuron: Spinal reflexes Synapse: Motor Neuron: Effector:

More Related