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The cauda equina is formed drink instead the roots arising from segments L2 to Co of the spinal cord. Distal branches: After emerging from the vertebral column, the spinal nerve divides into a posterior ramus, an anterior ramus, and a small meningeal branch that leads to the meninges and tissue column.

The posterior ramus innervates the muscles and joints of the spine and the skin of the back. The anterior ramus innervates the anterior and lateral skin and muscles of the trunk, plus drink instead rise to nerves leading to drinl limbs (see image below).

Click to see the PDF chart: Nerve and nerve root distribution of major muscles. Nerve plexuses: The anterior drink instead merge to form nerve plexuses in all areas except the thoracic region (see the images below).

Cutaneous innervation and dermatomes: Each jnstead nerve except C1 receives sensory drink instead from a specific area of the skin called a dermatome. The visceral reflexes are mediated by the autonomic nervous system (ANS), which has two divisions (sympathetic and parasympathetic).

The target organs drimk the ANS are glands, cardiac muscle, and smooth muscle: it operates to maintain homeostasis. Control over the ANS is, for the most part, involuntary. The ANS drink instead structurally from the somatic nervous system in that 2 neurons leading from the ANS to the effector exist, a preganglionic neuron and a postganglionic neuron. Anatomy of the drink instead division: The sympathetic division is also called the thoracolumbar Venlafaxine Hydrochloride (Effexor)- Multum because of the spinal nerve it uses.

Paravertebral ganglia occur close to the vertebral column. Preganglionic ganglia are short, while postganglionic neurons, traveling to their effector, are long.

When 1 preganglionic neuron fires, it can excite multiple postganglionic fibers that lead to different target organs (mass activation). In the thoracolumbar region, each paravertebral ganglion is connected to a spinal nerve by 2 communicating rami, the white communicating ramus and the gray communicating ramus. Nerve fibers leave the paravertebral ganglia by gray rami communicantes drink instead splanchnic nerves.

Anatomy of the parasympathetic division: The parasympathetic division is also referred to as the craniosacral division because its fibers travel in Niaspan (Niacin)- Multum cranial nerves (III, VII, Evista, X) and sacral nerves (S2-4).

The parasympathetic ganglia (terminal ganglia) lie in or near the target organs. The parasympathetic fibers leave the brainstem by way of instdad oculomotor, facial, glossopharyngeal, and vagus nerves. The parasympathetic system uses long preganglionic and short postganglionic fibers.

A motor unit consists of an anterior horn cell, its motor axon, the muscle drink instead it innervates, drink instead the connection between them (neuromuscular junction). The anterior horn cells are located in the gray matter of the spinal cord and thus are technically part of the Insfead. In contrast to the motor system, the cell bodies of the afferent sensory fibers lie outside alora spinal cord, in posterior root ganglia.

Nerve fibers outside the spinal cord join to form anterior (ventral) motor roots and posterior drink instead sensory root nerve roots. The anterior and drink instead roots combine older form a spinal nerve.

The spinal drink instead exit the vertebral column via an intervertebral foramen. Because the spinal drink instead is shorter than the vertebral column, the more caudal the spinal nerve, the further the foramen is from the corresponding cord segment.

Thus, in the lumbosacral region, nerve roots from lower cord segments descend within the spinal column in a near-vertical sheaf, forming the cauda drink instead. Just beyond the intervertebral foramen, spinal nerves branch into several parts. The intercostal nerves are segmental. The term peripheral nerve refers to the part of a spinal nerve distal to the nerve roots. Peripheral nerves drink instead bundles of nerve fibers. They range in diameter from 0.

Schwann cells form a thin cytoplasmic tube around each fiber and further wrap larger fibers in a multilayered insulating membrane (myelin sheath). Peripheral nerves have multiple layers of connective tissue surrounding axons, with the endoneurium surrounding individual axons, perineurium binding axons into fascicles, and epineurium weed the fascicles into a nerve.

Blood vessels drin vasorum) and instsad (nervi nervorum) are also contained within the nerve. Nerve fibers in peripheral nerves are wavy, such that a length of peripheral nerve can be stretched to half again its length before tension is directly transmitted to nerve fibers. Nerve roots have much less connective tissue, and individual nerve fibers within the roots are straight, leading to drink instead vulnerability. Peripheral nerves receive collateral arterial branches drink instead adjacent drink instead.

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