The PerikaryonThe Perikaryon::

The NeuronThe Neuron also called also called

the the somasoma or cell body is the or cell body is the portion of the neuron that portion of the neuron that contains the contains the nucleusnucleus. .

It is the metabolic center of It is the metabolic center of the neuron. *the neuron. *

The The nucleusnucleus of neurons is of neurons is usually filled with usually filled with euchromatineuchromatin and typically and typically contains a contains a prominentprominent nucleolusnucleolus. .

Nerve fiber CS Nerve fiber CS • EpineuriumEpineurium

• PerineuriumPerineurium

• EndoneuriumEndoneurium

Nerve, CS, FasciclesNerve, CS, Fascicles

• EpineuriumEpineurium

• PerineuriumPerineurium

• EndoneuriumEndoneurium

Peripheral nerve fiber Peripheral nerve fiber (myelinated), LS(myelinated), LS

Myelinated Axons, CSMyelinated Axons, CS

AxonAxon Schwan cell Schwan cell

Spinal CordSpinal Cord

Dorsal horn

Ventral horn

Dorsal roots of spinal

nerves

Central canal

Ventral roots of spinal nerves

ventral median fissure

Dorsal median fissure

ventral spinal artery

Spinal cord

Spinal cord.Spinal cord.

Dorsal horn

Ventral horn

Dorsal roots of a spinal

nerve

Central canal

White matter

Ventral horn

Ventral median fissure

Central canal Ventral roots of a spinal nerve

Spinal cordSpinal cord.

CerebrumCerebrumi. Molecular Layer

ii. Granular Layer (small

sized neurone)

iii. Pyramidal-shaped

neurons (Medium sized)

iv. Inner Granular Layer

(large sized)

v. Inner Pyramidal Layer

(larger than iv)

vi. Polymorphic Layer

CerebellumCerebellum

Sensory ganglionSensory ganglion The nuclei of the neurons are The nuclei of the neurons are centrallycentrally located. located.

Satellite cells

The multipolar neurons within autonomic ganglia are incompletely encapsulated by satellite cells.

The neuronal nuclei of autonomic ganglia are eccentrically located.

Section:Autonomic Autonomic

ganglionganglion

Muscular tissueMuscular tissue

Dr. Snur MA Hassan

Histopathology2012-2013

Types of Muscle TissueTypes of Muscle TissueSkeletal- Cells with obvious striations- Contractions are voluntary

Cardiac:-Cells are striated-Contractions are involuntary

Smooth: •Lack striations•Contractions are involuntary (not voluntary)

Skeletal muscleSkeletal muscle

SarcoplasmSarcoplasmNucleusNucleus

PerimysiumPerimysiumEndomysiumEndomysium

Motor end plateMotor end plate

Cardiac MuscleCardiac Muscle

1.1. Branched Branched fibersfibers

2.2. Centrally Centrally located located nucleusnucleus

3.3. Intercalated Intercalated disc (arrow)disc (arrow)

4.4. Cross striationCross striation

Cardiac muscleCardiac muscle

Intercalated disc Intercalated disc (arrow head)(arrow head)

Smooth muscleSmooth muscleCS & LSCS & LS

SarcoplasmSarcoplasm

NucleusNucleus