Download MBBS Physiology Presentations 25 Nerve Muscle Physiology Nerve Classification Lecture Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) 1st Year, 2nd Year, 3rd Year and Final year Physiology 25 Nerve Muscle Physiology Nerve Classification PPT-Powerpoint Presentations and lecture notes

Excitability
Conductivity
Unfatigability
Refractory period
All or none law
Accomodation
Joseph Erlanger

Herbert Spencer Gasser

Fiber Type

Functions

Fiber

Conduction

Diameter

Velocity

(?m)

(m/sec)

A

Proprioception,

12 -20

70 -120

Somatic motor

A

Touch, pressure

5-12

30-70

A

Motor to muscle

3-6

15-30

spindles

A

Pain, temperature

2-5

12-30

B

Preganglionic

<3

3-15

autonomic

C (Dorsal root) Pain, temperature

0.4-1.2

0.5-2

C

Postganglionic

0.3-1.3

0.7-2.3

(Sympathetic)

sympathetic
Number

Origin

Fiber Type

Ia

Muscle Spindle,

A

annulo- spiral ending

Ib

Golgi tendon organs

A

II

Muscle spindle,

A

flower spray ending;

touch , pressure

III

Pain and cold

A

receptors, some

touch receptors

IV

Pain, temperature,

C

and other receptors

Susceptibility

Most

Intermediate

Least

to:

Susceptible

susceptible

Hypoxia

B

A

C

Pressure

A

B

C

Local

C

B

A

Anaesthetics
Augustus Volney Waller