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 pectoral and pelvic girdles

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Difference between pectoral and pelvic girdles
Pectoral girdles
Pelvic girdles
Ossification both intramembranous and intracartilaginous
Ossification: only intracartilaginous
 It is situated in the shoulder region.
It is situated in the hip region.
The glenoid cavity of the scapula forms ball and socket joint with the humerus.
A cup-shaped cavity called acetabulum forms ball and socket joint with the femur.
The glenoid cavity present in the pectoral girdle is comparatively shallow.
Acetabulum cavity present in the pelvic girdle is comparatively deep.
It gives articulation to forelimb  bones.
It gives articulation to hindlimb bones.
The back muscles are attached to the pectoral girdle.
The hip muscles are attached to the pelvic girdle.
Two principal components clavicle and scapula remain separate
Three components ilium, ischium and pubis which fuse into a single hip bone
No articulation with verterbral column
Articulation with vertebral column (sacrum )
No direct ventral articulation
Direct ventral articulation at symphysis pubis
Comparatively lightly built for mobility
Massively constructed for resistance to stress
Shallow joint with limb allowing wide range of movements
Deep joint with limb, limiting range of movements

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