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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 1-4 palmar and 1-4 dorsal interossei Origin Insertion 1 st palmar interossei One attachment site at the Ulnar (medial) side of 1 st metacarpal bone 1 st dorsal interossei Two attachment sites on the 1 & 2 metacarpal bones Ulnar (medial ) side of the proximal phalanx of thumb Radial (lateral) side of proximal phalanx of index finger Origin Insertion 2 nd palmar interossei One attachment site at the Ulnar (medial) side of 2 nd   metacarpal bone 2 nd   dorsal  inteross ei Two attachment sites on the  2 & 3  metacarpal bones Ulnar (medial) side of the proximal phalanx of index finger  Radial (lateral ) side of proximal phalanx of middle  finger Origin Insertion 3 rd palmar interossei One attachment site at th...
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Difference between the palmar Interossei & dorsal interossei muscles of the hand

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Difference between the palmar Interossei  & dorsal interossei muscles of the hand Palmar  interossei Dorsal interossei Character Uni-pennate Bi-pennete Size Smaller than the dorsal interossei Larger than the palmar interossei Origin by single head-from one side of the the body of the palmar surface of metacarpal bones By two heads; from the adjacent sides the bodies of all metacarpal bones View They are only seen from the palmar aspect of the interosseous space Dorsal interossei can be seen from both dorsal and palmar aspects Action Abduction-Carry the fingers or toes towards the middle line PAD : P : palmar interossei AD : adduction Abduction; carry the fingers or toes away from the middle line DAB: D: dorsal interossei AB: abduction Special note Thumb require no Palmaris interossei thumb already possessing...
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Difference between sigmoid colon and rectum

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Difference between sigmoid colon and rectum Sigmoid colon Rectum It begins at left pelvic brim as a continuation of descending colon and ends in front of the third sacral vertebra It begins as continuation of sigmoid colon in front of the third sacral vertebra and is continuous with the anal canal Length: 40 cm Length: 12 cm It is suspended from the posterior pelvic wall by a peritoneal fold the sigmoid mesocolon Upper 1/3 : anterior surface and both lateral surfaces are covered by peritoneum Middle 1/3 : only anterior surface is covered by peritoneum Lower 1/3 : devoid of peritoneum It is supplied by 3-4 sigmoid arteries derived from the inferior mesenteric artery It is supplied by superior rectal artery , branch of inferior mesenteric artery Middle rectal artery is a branch of the anterior division of each internal iliac artery Inferior rectal artery , a branch of ...
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Difference between white adipocyte and brown adipocyte

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Difference between white adipocyte and brown adipocyte White adipocyte Brown adipocyte This type of adipocytes are predominantly found in adult Brown adipose tissue is present in humans during fetal life but diminishes during the first decade after birth. Distribution: subcutaneous tissue, breast, greater omentum, mesenteries, visceral pericardium, orbital cavity , retroperitoneal space, bone marrow  It is located on the back, along the upper half of the spine, and toward the shoulders. In adult it is gradually decreases. At  first decade of life it is situated in the cervical, axillary, paravertebral, mediastinal, sternal,and abdominal regions of the body. It then disappears from most sites except for regions around the kidney, adrenal glands, large vessels (i.e., aorta), and regions of the neck (deep cervical and supraclavicular), regions of the back (interscapular and paravertebral), and thorax (me...
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Difference between gray and white matter

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Difference between gray matter and white matter Topics Gray matter White matter Composition Nerve cell body , Neuroglia, Processes , Blood vessels Neuroglia, Processes , Blood vessels Colour Light grey White Percentage Occupy 40% of brain Occupy 60% of brain Maturity Girl  11 years Boy 12 years  Girl 25 years Boy 20 years Sex difference Male 6.5 more gray matter Female   contain 10 times more  white matter Proportion of Men have higher proportion of white matter women have higher proportion of grey  matter Function It is the information processing region  of brain It makes connection between different information processing region of brain Oxygen use It uses almost 95% of oxygen It uses remaining  5% Loss of volume It v...
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