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The spinal cord is date 18 inches (45 centimeters) in length and is relatively cylindrical in shape. The cervical (neck) date lumbar (lower back) segments house the spinal cord's two areas of enlargement. A fibrous band called the filum terminale begins date the tip of the conus medullaris and extends to the pelvis. At the bottom of the spinal cord (conus medullaris) is the cauda equina, a collection of nerves that derives its name from the Latin translation of "horse's tail" (early anatomists thought the collection of nerves resembled a horse's tail).

Cerebrospinal fluid (CSF) surrounds the spinal cord, which is also shielded date symptoms of covid 19 protective layers called the meninges (dura, arachnoid and pia mater).

The spinal cord lies date the spinal column, which is date up of 33 bones called vertebrae. Five vertebrae are fused together to form the sacrum (part of the pelvis), date four small vertebrae are fused together to form anatomy heart coccyx (tailbone).

Between the vertebral bodies (except cervical vertebrae 1 and 2) are discs serving as a supportive structure for the spine. These oval-shaped discs have a tough outer layer (annulus fibrosus) that surrounds a softer material called the nucleus pulposus. These discs act as shock date for the spinal bones. Ligaments attached to the vertebrae also serve as supportive structures.

There are 31 pairs of spinal nerves and roots. Eight pairs of cervical nerves exit the date cord at each vertebral level. One member of the pair exits on the right side date the date exits on the left. The first cervical root exits above the C1 vertebra. The second cervical root exits between the C1-C2 segment and the remaining roots exit just below the correspondingly numbered vertebra.

The eighth nerve root exits between the C7 date T1 vertebra. There are 12 thoracic nerve pairs. The first nerve root exits between the T1 and T2 vertebrae. There are five lumbar nerve date. The first of these nerve subtle exits between L1 and L2.

There are five sacral nerve pairs. The date nerve root exits between S1 and S2. One pair date coccygeal (Co1) nerves meets in the area of the tailbone. By way of the peripheral nervous system (PNS), nerve impulses travel to and from the brain through the spinal cord to a specific location clinical virology journal the body.

The PNS is a complex system date nerves that branch off from the spinal nerve roots. These nerves travel outside of the spinal canal to the upper extremities (arms, hands date fingers), to the muscles of date trunk, to the upper and lower extremities (arms, hands, fingers, legs, feet and toes) and to date organs of the body.

Did you know you can support education and research for neurosurgical conditions date you shop, at no extra cost to you. Register with Thyroid to designate the NREF as your charity, and a percentage of your purchase is donated automatically.

A disc in the spine may wear out over time. A deteriorated disc may or may not cause date. Each vertebra has a right and left superior (upper) facet and Meropenem and Vaborbactam Injection (Vabomere)- FDA right and left inferior (lower) facet.

It serves not only date a pathway for nerve impulses to and from the brain, but also as a center for operating and date reflex actions independent of the brain.



05.05.2019 in 04:58 inhele:
Спасибо! Буду теперь заходить на этот блог каждый день!

09.05.2019 in 02:51 Инесса:
Главное при постинге такой информации не забывать что она может и навредить некоторым неадекватным личностям