Lab 12 the central nervous system

Dorsal root ganglion M. For now, we will focus on the common structural features that make neurons identifiable at the level of resolution of light and electron microscopes.

The brain is encased in the skull, and protected by the cranium. While every neuron possesses these four structural features, the relative positions of these features determine the type of neuron. Other nuclei are involved in balancetastehearing and control of muscles of the face and neck.

The bulge of the spinal cord that gives off nerves to the upper limbs is called the cervical enlargement. Not all neurons look or act the same - they vary in size, shape, and complexity, and the important differences between the various classes of neurons will be of great importance in your study of Neuroanatomy.

CerebrumCerebral cortexBasal gangliaAmygdalaand Hippocampus The cerebrum of cerebral hemispheres make up the largest visual portion of the human brain. Glial Cell in the Central Nervous System Neuroglia are the main non-nervous cells of the central nervous system.

Axons can be up to a meter long. The neuromuscular junction will be discussed in the Muscle Lab. Myelin sheath, endoneurium, perineurium, epineurium. Pre-Lab Reading Introduction The nervous system is extraordinarily complex, and it is therefore impossible to cover it in its entirety in a single laboratory.

Define senility and list some possible causes. From and to the spinal cord are projections of the peripheral nervous system in the form of spinal nerves sometimes segmental nerves [7]. Myelin sheaths are electrical insulators and prevent current from leaving axons. You will observe four types of CNS neuroglia in this lab: The second example shows the constriction of the pupil as a result of the activation of the Eddinger-Westphal nucleus a cerebral ganglion.

James Storey

Functionally, the cerebral cortex is involved in planning and carrying out of everyday tasks. Muscles that require fine control have fewer muscle fibers innervated by each neuron; muscles that participate in less controlled movements may have many fibers innervated by one neuron.

Transverse cerebral fissure B. The metencephalon becomes, among other things, the pons and the cerebellumthe myelencephalon forms the medulla oblongataand their cavities develop into the fourth ventricle.

Further it is involved in motion that has been learned and perfected though practice, and will adapt to new learned movements.

Instead, you can use Nissl substance to make this easier. Central Nervous System Identify and indicate the functions of the major regions of the cerebral hemispheres, diencephalon, brain stem, and cerebellum on a human brain model or diagram.

A multipolar neuron has multiple dendrites extending from the cell body and a single axon extending in the opposite direction.

The ventral horn of the spinal cord contains the cell bodies of motor neurons.

Lab 12: the Central Nervous System

Additionally the hypothalamus plays a role in motivation and many other behaviors of the individual. Brainstem The brainstem consists of the medullathe pons and the midbrain. Diencephalon elaborations include the subthalamushypothalamusthalamus and epithalamusand its cavity forms the third ventricle.

As a vertebrate grows, these vesicles differentiate further still. To ensure signals move at sufficient speed, myelination is needed.

Finally, the entire peripheral nerve trunk is encapsulated by another connective tissue sheath called the epineurium. Describe the composition of gray matter and white matter.

Discuss the formation and function of cerebrospinal fluid and the blood-brain barrier. Occipital lobe of cerebral hemisphere M. Its function includes the control of posture, and the coordination of movements of parts of the body, including the eyes and head as well as the limbs.

Spinal dura mater I. Identify the location and major function of each of these cells: Identify the cranial nerves by number and by name, and list the major functions of each.

Astrocytes occur as two histological types. Axons in the central nervous system are often very short barely a few millimeters and do not need the same degree of isolation as peripheral nerves do. Spinal cord Diagram of the columns and of the course of the fibers in the spinal cord.Hour: _____ Nervous System Lab.

Introduction: The human nervous system is composed of the brain and spinal cord (Central Nervous System, CNS) and the nerves which branch out from the CNS, the Peripheral Nervous System (PNS). Conducting sensory impulses from upper teeth __maxillary trigeminal_____ 7.

Conducting sensory impulses form lower teeth __mandibular trigeminal___ 8. Nervous System Lab. Introduction: The human nervous system is composed of the brain and spinal cord (Central Nervous System, CNS) and the nerves which branch out from the CNS, the Peripheral Nervous System (PNS).

Central nervous system

1 Chapter 12 The Nervous System Biology The Structure of the Nervous System y Humans have the most com plex nervous System of all organisms on earth yThis is the result of millions of years of evolution. y The evolution of the more complex vertebrate brain exhibits a number of trends.

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central nervous system brain &. autonomic motor neuron that has its cell body in the central nervous system and projects its axon to a peripheral ganglion. Postganglionic neuron autonomic motor neuron that has its cell body in the peripheral ganglion and projects axon to an effector.

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Lab 12 the central nervous system
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