PS 1001:03 Lecture Notes - Lecture 8: Myelin, Spinal Nerve, Schwann Cell

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ambercattle379

23 May 2018

School

James Cook University

Department

Course

PS 1001:03

Professor

sue barrs

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Describe the components and connective tissue coverings of spinal

nerves

Brain and spinal cord

○

CNS

Sensory receptors, nerves conducting to and from CNS, associated ganglia and

motor endings

▪

Nerves are not homogenous tissue - different tissue types in the nerve -> different

mechanical properties

▪

Cranial and spinal nerves

○

PNS

Nervous system

Impulses TO CNS

○

Sensory (afferent) division

Impulses FROM CNS

○

Somatic (voluntary) - serves skeletal muscles

○

Automatic (involuntary) 0 innvervates smooth/cardiac muscles and glands

○

Motor (efferent)

Lie between sensory and motor neurons in the neural pathways

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Interneurons

Major functional divisions

Screen clipping taken: 13/03/2018 2:37 PM

Cell body - with nucleus, organelles

Multipolar

○

Bipolar

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Unipolar

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Pseudounipolar

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Classified according to number of processes issuing from the cell body

Neurones

L3 - Mechanics of neural tissue

Tuesday, 13 March 2018

1:37 PM

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Screen clipping taken: 13/03/2018 2:40 PM

Terminology

What

Name in CNS

Name in PNS

Bundle of nerve fibres

Tract

Nerve

Collection of cell bodies

Nucleus

Ganglion

Large nerve fibres myelinated

PNS = Schwann cells

○

CNS = oligodendrocytes

○

Myelin sheath formed?

Sheath has gaps = Nodes of Ranvier

Doral root - sensory fibres (afferent)

▪

Ventral root - motor fibres (efferent)

▪

Arises by 2 roots from the spinal cord

○

Roots unite to form a spinal nerve - so is mixed motor and sensory

○

Screen clipping taken: 13/03/2018 2:44 PM

Typical Spinal nerve in PNS

Nerves

Specific region of the skin surface monitored by a single pair of spinal nerves

Precise boundaries of the dermatomes overlap to some degree

Important because damage of infection of a spinal nerve will produce characteristic loss of

sensation in the skin

Can test if certain nerve compromised

e.g. right index finger linked to C7 nerve

Dermatomes

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Document Summary

Describe the components and connective tissue coverings of spinal nerves. Sensory receptors, nerves conducting to and from cns, associated ganglia and motor endings. Nerves are not homogenous tissue - different tissue types in the nerve -> different mechanical properties. Automatic (involuntary) 0 innvervates smooth/cardiac muscles and glands. Lie between sensory and motor neurons in the neural pathways. Classified according to number of processes issuing from the cell body. Arises by 2 roots from the spinal cord. Roots unite to form a spinal nerve - so is mixed motor and sensory. Specific region of the skin surface monitored by a single pair of spinal nerves. Precise boundaries of the dermatomes overlap to some degree. Important because damage of infection of a spinal nerve will produce characteristic loss of sensation in the skin. Can test if certain nerve compromised e. g. right index finger linked to c7 nerve.

Related Questions

1. Kidneys help to maintain a proper balance of _________ within the body.

Phosphorous

Chloride

Potassium

Calcium Phosphate

ions

All of the above

2. The nervous system has how many major categories?

3. Which major category of the nervous system contains both the Somatic and the Autonomic divisions?

Central Nervous System

Peripheral Nervous System

Neither of these

Both of these

4. Which organ or structure helps to control the master endocrine gland (pituitary gland)?

The pancreas

The thorax

Peyerâs patches

The hypothalamus

6. This tiny gland is located at the base of the brain and produces the hormone melanin.

Parathyroid

Pituitary

Hypothalamus

Pineal

7. These glands are situated right above the kidneys. The hormones produced by these glands help us to cope with stress.

Thyroid

Parathyroid

Hypothalamus

Adrenals

8. The hormones necessary for the production of sperm are produced in the __________.

Kidneys

Testes

Ovaries

None of the above

9. The bloodstream assists the endocrine organs and structures by:

Removing hormones from the body

Delivering hormones to target cells

Delivering hormones to secretory cells

The bloodstream does not come into contact with endocrine structures or organs
10. The pancreas _____________.

Is a master gland that controls many other glands

Produces progesterone and oestrogen

Is a salivary gland

Regulates blood sugar, aid in digestion

11. The basic function of the endocrine system is ________ in nature.

Digestive

Reproductive

Hormonal

Proximal

13. Urinary tract infections (UTIs) are experienced by many people during their lifetimes. Urinary tract infections can involve any bacterial infection of the urinary system structures; the kidneys, bladder, ureters, or urethra. They are caused by bacteria entering the body through the urethra and traveling upward into the body. Symptoms can range from mild discomfort when urinating to extreme pain and the loss of blood during urination. They occur more frequently in women than men, and are often treated by antibiotics in addition to home remedies, such as drinking more water and drinking cranberry juice.

Based on what you have learned about the cause of urinary tract infections, which of the following precautions would help to prevent reoccurring infections?

Taking pain medication when symptoms occur

Placing a hot pack on the abdomen when symptoms occur

Practicing good hygiene Exercising regularly

14. The nervous system is divided into two major divisions: the Central Nervous System and the Peripheral Nervous System. Those divisions have structures that can be classified as belonging to two different subdivisions: the Somatic and the Autonomic systems. The nervous system can be summarized as a complex system of interconnected nerves and special cells called neurons that are used to transmit information (by means of small electrical impulses). Use the information in the table below to help answer questions about the nervous system. Division Organs & Structures Functions Central Nervous System (CNS) Brain Spinal Cord Nerves This is the bodyâs assessment and communication center. It analyzes the information received from the sensory neurons and responds. Peripheral Nervous System (PNS) Sensory Neurons Ganglia (clusters of neurons) Nerves that connect to one another and to the CNS The sensory neurons react to physical stimuli such as light, sound, heat, and pressure, and transmit that information to the CNS. Subdivisions Description Examples Somatic The Somatic system is comprised of nerves that connect the brain and spinal cord to the muscles of the body and sensory receptors in the skin. Reactions to physical stimuli like heat or light. Using your hand to touch Eating food Autonomic The Autonomic system largely involuntary. This system controls the unconscious functions of the body. Breathing Blood Pressure

Feeling overwhelmed or startled by exposure to very loud noises is likely a reaction to information collected by which subdivision of the nervous system:

Somatic

Autonomic

No answer text provided.

15. The thyroid gland is perhaps the most well-known member of the pancreatic system. Many adults are screened for thyroid problems during routine physical exams. This butterfly shaped gland is found at the base of the neck and releases hormones that affect the bodyâs metabolism (the way the body uses energy). The thyroidâs two main hormones are T3 and T4, and they affect many body functions, including: â¢ Breathing â¢ Heart rate â¢ Central and peripheral nervous systems â¢ Body weight â¢ Muscle strength â¢ Menstrual cycles â¢ Body temperature â¢ Cholesterol levels Two common disorders associated with the thyroid include hyperthyroidism and hypothyroidism. Some of the symptoms associated with these disorders are listed in the table below. Hyperthyroidism (Too many hormones released) Hypothyroidism (Too few hormones released) Anxiety Irritability or moodiness Nervousness, hyperactivity Sweating or sensitivity to high temperatures Hand trembling (shaking) Hair loss Missed or light menstrual periods Trouble sleeping Tiredness and fatigue Difficulty concentrating Dry skin and hair Depression Sensitivity to cold temperature Frequent, heavy periods Joint and muscle pain A patient complains of arthritis-like pain in the joints of her hands, but tests for arthritis come back negative. The doctor then suggests a thyroid function test. The doctor is most likely concerned about:

High levels of T3 and T4 hormones in the body

Low levels of T3 and T4 hormones in the body

No answer text provided.

No answer text provided

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PS 1001:03 Lecture Notes - Lecture 8: Myelin, Spinal Nerve, Schwann Cell

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