Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between histology of stomach and duodenum : lecture note

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Difference between histology of stomach and duodenum 

Topic

Histology of stomach

Histology of esophagus

Histological layer from within outward

Mucosa

Submucosa

Muscularis externa

Serosa (most of the part)

Mucosa

Submucosa

Muscularis externa

Adventitia (most of the part)

Lining epithelium

Simple columnar epithelium

Non-keratinized stratified squamous epithelium  

Villi

Absent

Present

Lamina propria

Contain gastric gland

Contain esophageal gland

Muscularis mucosa

Thin

Usually thick

Submucosa

Contain no gland

Contain gland

Muscularis externa

Smooth muscle cells are arranged in three layers

Inner oblique

Middle circular

Outer longitudinal

Upper 1/3 contain skeletal muscle

Middle 1/3 contain both skeletal and smooth muscle

Lower 1/3 contain only smooth muscle cells

Arrangement of muscle layers  

Inner circular

Outer longitudinal

 



















 

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