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 layers of anterior abdominal wall medial and lateral side of linea semilunaris

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The lateral part of rectus abdominis muscle produce a groove in the anterior abdominal wall , is known as linea semilunaris.
This groove is important because medial to this  groove and lateral to this  groove the layers of anterior abdomnal wall is different
Layers of anterior abdominal wall, medial to the linea semilunaris  (from before backward )
1)    Skin
2)    Superficial fascia : fascia camper and fascia scarpa
3)    Aponeurosis of external oblique abdominis
4)    Aponeurosis of anterior layer of internal oblique abdominis
5)    Rectus abdominis muscle
6)    Aponeurosis of posterior layer of internal oblique abdominis
7)    Aponeurosis of transversus abdominis
8)    Fascia transversalis
9)    Extraperitoneal tissue
10)                       Parietal layer of peritoneum
 Layers of anterior abdominal wall, lateral to the linea semilunaris  (from before backward )
1)    Skin
2)    Superficial fascia : fascia camper and fascia scarpa
3)     external oblique abdominis muscle
4)     internal oblique abdominis muscle
5)     transversus abdominis muscle
6)    Fascia transversalis
7)    Extraperitoneal tissue

8)    Parietal layer of peritoneum 

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