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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Summary of difference between male and female sacrum

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Difference between male and female sacrum 
 Sacrum :
 The sacrum is one of the vertebrae of our vertebral column, which is at the bottom of the backbone. Accordingly, it locates between the L5 vertebra and coccyx vertebra in the vertebral column. Also, it is attached with right and left iliac bones of the hip bone and contributes to the formation of the pelvis.
The sacrum has three different surfaces which are shaped to accommodate surrounding pelvic structures. Overall it is concave (curved upon itself). The base of the sacrum, the broadest and uppermost part, is tilted forward as the sacral promontory internally. The central part is curved outward toward the posterior, allowing greater room for the pelvic cavity.

Sexual dimorphism

The sacrum is noticeably sexually dimorphic (differently shaped in males and females).
In the female the sacrum is shorter and wider than in the male; the lower half forms a greater angle with the upper; the upper half is nearly straight, the lower half presenting the greatest amount of curvature. The bone is also directed more obliquely backward; this increases the size of the pelvic cavity and renders the sacrovertebral angle more prominent.
In the male the curvature is more evenly distributed over the whole length of the bone, and is altogether larger than in the female.


Difference between male and female sacrum
Features
Male
Female
Base of the sacrum
Body of S1 vertebra is broad and alae are narrow
Body is narrow and alae is broad
Sacral index
Less
Sacrum is relatively long and narrower
More
Sacrum is relatively shorter and broadary
Pelvic surface
C shaped smoothly curved
Concavity of sacrum is shallower
J shaped Abruptly curved
Concavity of sacrum is deeper
Auricular surface
Relatively larger and less obliquely set
Concavity of dorsal border of auricular surface is less marked
Relatively smaller and more obliquely set
Cancavity of dorsal border of auricular surface is more marked
Pelvic inlet and outlet
It is a part of the pelvis and affects the shapes of the pelvis inlet and outlet. Therefore, due to the structure of the sacrum and its curvature, pelvic inlet of the males is heart-shaped while the pelvic outlet is narrower.
the shapes of the pelvic inlet and outlet of females differ from that of the males. Accordingly, female pelvic inlet is oval shaped while their pelvic outlet is wider than males.
 pubic arch
pubic arch forms an angle closer to 600 in males.
pubic arch forms an angle closer to 900.

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