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Thursday, October 21, 2010

Autonomic Nerve System 2

Salam.

Bersambung lagi dalam Autonomic Nerve System.

Sekarang kita pergi ke Autonomic Nerve System. Autonomic Nerve System mempunyai dua jenis fibres iatu Afferent Fibers dan Efferent Fibers.

What is Afferent? And what is Efferent Fibres?

Untuk memudahkan kita memahaminya, Afferent Fibers adalah nerves/neurons yang membawa impulse atau sensations dari receptor organ ke otak(brain) atau spinal cord.

Efferent Fibers pula adalah nerves/neurons yang membawa impulses daripada brain ke visceral/effector organs.

Visceral::the organ within the body cavities especially the organ of abdominal cavities.ex:stomach.

Efferent Fibers of Autonomic Nerves Systems boleh terbahagi kepada dua:

Preganglionic
(1)located in the brain atau spinal cord.
(2)called as Preganglionic Fibres
(3)the axon is from CNS ke Autonomic Ganglion
(4)Fibres types: B-myelinated
(5)Colour: Whitis Fibre


Postganglionic
(1)located  in the Autonomic Ganglion outside the CNS.
(2)called as Postganglionic Fibers.
(3) the axon is from Autonomic Organs to ogans.
(4)non myelinated fibers.
(5)grey fibre

So,kita dapat simpulkan pergerakan sesuatu nerves seperti begini jika mengikut kepada Autonomic Nerve System.

Receptor--->brain,spinal cord---->Preganglionoc Fibers----> Postganglionic Fibers---->Effector Organs
   (Afferent fibers)                                                 (Efferent Fibers)                       

Movement oleh Efferent Fibers di Autonomic Nerve Systems

Preganglionic Nerves         Leaves the spinal cord with the         Leaves the ventral root         Postganglionic
(lateral horn of        -----> lateral horn as the white ramus ----->and join the autonomic  ---->Fibers
  spianal cord)                        because it myelinated                   ganglia as the grey ramus.  

Faham tak? Ringkasnya camni lah

Preganglionic ni terletak kat laterasl hornof the spinal cord. Preganglionic ni meninggalkan spinal cord sebagai White Ramus Commuinicans bersama-sama dengan Ventral Root. Sebab apa dia white ramus? Sebab ianya B-myelinated. Fibers ini meninggalkan Ventral Root dan sampai di automic Ganglia sebagai Grey Ramus Communicans.

Apa bezanya dengan somatic nerves?

Axons of the neurons ni terletak kat anterior horn of  spinal cord dan membawa impulses terus ke effector muscles tanpa melalui apa-apa ganglia.

Ok,itu saja lah kot setakat ni. Lain kali lah ye!

p/s: This is the real medic student life. Really stressful and hectic.

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