what is the largest nerve
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Peripheral Nerve System 1 It innervates muscles in the arm that extend the elbow and muscles in the forearm, which enables the wrist and fingers to straighten or extend.  Sciatic nerve – The sciatic nerve is the largest single nerve in the body, extending from the back of the pelvis down the back of the thigh. It is the primary nerve of the leg and is responsible for innervating the muscles in the hip and lower limbs (including the tibial nerve and common fibular nerve).
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Cranial Nerves The trochlear nerve,[help 1] also called the fourth cranial nerve or cranial nerve IV, is a motor nerve that innervates only a single muscle: the superior oblique muscle of the eye, which operates through the pulley-like trochlea. The trochlear nerve is unique among the cranial nerves in several respects: It is the smallest nerve in terms of the number of axons it contains. It has the greatest intracranial length. It is the only cranial nerve that exits from the dorsal aspect of the brainstem. I
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Sciatic Nerve and Sciatica The sciatic nerve is the largest single nerve in the human body; it runs from each side of the lower spine through deep in the rear and back of the thigh and all the way down … to the foot, connecting the spinal cord with the leg and foot muscles.
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Ulnar nerve Ulnar nerve. In human anatomy, the ulnar nerve is a nerve that runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body (meaning unprotected by muscle or bone), so injury is common.
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- As the longest nerve, as well as the nerve with the smallest diameter, the trochlear nerve is also the only nerve to exit the brain dorsally, or from the top and posterior (back) of the brain. The term trochlear nerve comes from the Latin word trochlea, which means pulley..It is responsible for innervating the superior oblique muscle of the eye, which acts as a sort of a pulley system. The superior oblique muscle allows the eye to move toward the midline of the body and downward simultaneously.In other words, using the superior oblique muscles will cause the eyes to become crossed.. If the trochlear nerve is harmed, a condition called trochlear nerve palsy (or fourth nerve palsy) may result.This condition causes the affected eye to rotate upwards and towards the midline when the person is looking straight ahead.f the trochlear nerve is harmed, a condition called trochlear nerve palsy (or fourth nerve palsy) may result. This condition causes the affected eye to rotate upwards and towards the midline when the person is looking straight ahead.
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Vagus Nerve Anatomy Gross Anatomy. The vagus nerve is the longest cranial nerve. It contains motor and sensory fibers and, because it passes through the neck and thorax to the abdomen, has the widest distribution in the body. It contains somatic and visceral afferent fibers, as well as general and special visceral efferent fibers.(See Table 1, below.).agus nerve branches in the thorax. The inferior cardiac branch is also called the ramus cardiaci inferiors. On the right side, it arises from the trunk of the vagus as it lies beside the trachea. On the left side, it originates from the recurrent laryngeal nerve only.
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Sciatic Nerve The sciatic nerve is a large, bilateral fiber formed from the anterior and posterior divisions of nerve roots L4, L5, S1, S2 and S3. It is the largest branch of the lumbosacral plexus. The nerve supplies the posterior compartment of the thigh, the leg and foot.
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- Sciatic nerve. The sciatic supplies nearly the whole of the skin of the leg, the muscles of the back of the thigh, and those of the leg and foot. It is the largest nerve in the body, measuring 2 cm in breadth, and is also the continuation of the flattened back of the sacral plexus.he sacral plexus is derived from the anterior rami of spinal nerves L4, L5, S1, S2, S3, and S4. Each of these anterior rami gives rise to anterior and posterior branches. The anterior branches supply flexor muscles of the lower limb, and posterior branches supply the extensor and abductor muscles.
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Sciatic nerve The sciatic nerve (/ s aɪ ˈ æ t ɪ k /; also called ischiadic nerve, ischiatic nerve, butt nerve) is a large nerve in humans and animals. It begins in the lower back and runs through the buttock and down the lower limb. It is the longest and widest single nerve in the human body, going from the top of the leg to the foot on the posterior aspect.
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Ulnar nerve In human anatomy, the ulnar nerve is a nerve that runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body, so injury is common. This nerve is directly connected to the little finger, and the adjacent half of the ring finger, innervating the palmar aspect of these fingers, including both front and back of the tips, perhaps as far back as the fingernail beds. This nerve can cause an elec
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Nervous System - Neuroanatomy - the major nerve of this plexus is the sciatic nerve; - it is the largest nerve of the human body! - travels through the greater sciatic notch of the hip bone down to the posterior thigh; - innervates the lower trunk and the posterior surface of thigh and leg;
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- The nerve also contains fibers bringing sensation from the face to the Pons. It is the largest of the cranial nerves and forms three divisions: Opthalmic division (V1) - from skin of anterior scalp, upper eyelid, nose, nasal cavity mucosa and lacrimal gland through superior orbital fissure.ranial Nerves. There are 12 pairs of cranial nerves and because they are nerves, they are considered to be a part of the peripheral nervous system (PNS). Conventionally, each of the 12 pairs of nerves is named using a Roman numeral (I through XII) together with the descriptive name for the nerve.
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Cranial Nerves - Anatomy & Physiology The trochlear nerve is part of the cranial nerve group responsible for innervation of the muscles of the head. The trochlear nerve originates from the dorsal mid-brain and is a motor nerve. It is composed of general somatic efferent fibres and is the smallest of the cranial nerves.
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- The sciatic nerve is the largest single nerve in the body. It begins in the lower part of the back and runs through the hip/buttock region, giving off two branches; the articular branch, which provides nerve function to the hip-joint, and the muscular branch, which extends into the muscles of the thigh.
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- The sciatic nerve is the dominant nerve that innervates the lower back and the lower extremities. It travels from the lower spine, through the pelvis, and down each leg. It is the longest and widest nerve in the human body.
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The Trigeminal Nerve (CN V) The trigeminal nerve, CN V, is the fifth paired cranial nerve. It is also the largest cranial nerve. In this article, we shall look at the anatomical course of the nerve, and the motor, sensory and parasympathetic functions of its terminal branches.
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Axon Some axons can extend up to one meter or more while others extend as little as one millimeter. The longest axons in the human body are those of the sciatic nerve, which run from the base of the spinal cord to the big toe of each foot. The diameter of axons is also variable.Most individual axons are microscopic in diameter (typically about one micrometer (µm) across).ome axons can extend up to one meter or more while others extend as little as one millimeter. The longest axons in the human body are those of the sciatic nerve, which run from the base of the spinal cord to the big toe of each foot. The diameter of axons is also variable.
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- For the comedy-drama film, see Funny Bones. For the comedy club, see The Funny Bone. In human anatomy, the ulnar nerve is a nerve that runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body (meaning unprotected by muscle or bone), so injury is common.
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The Names, Functions, and Locations of Cranial Nerves The names and major functions of these nerves are listed below. 1  Olfactory Nerve: Sense of smell. 2  Optic Nerve: Vision. 3  Oculomotor Nerve: Eyeball and eyelid movement. 4  Trochlear Nerve: Eye movement. 5  Trigeminal Nerve: This is the largest cranial nerve and is divided into three branches consisting of the ophthalmic, maxillary and mandibular nerves.
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Sciatic nerve Sciatic nerve. The sciatic nerve is the dominant nerve that innervates the lower back and the lower extremities. It travels from the lower spine, through the pelvis, and down each leg. It is the longest and widest nerve in the human body.
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sciatic nerve sciatic nerve The main nerve of the leg and the largest nerve in the body. The sciatic nerve is a mixed MOTOR and sensory nerve. It arises from the lower end of the spinal cord and runs down through the buttock to the back of the thigh. It supplies the muscles of the hip, many of the thigh muscles, all the muscles of the lower leg and foot, and most of the skin of the leg.
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- Location. The sciatic nerve is the largest single nerve in the body. It begins in the lower part of the back and runs through the hip/buttock region, giving off two branches; the articular branch, which provides nerve function to the hip-joint, and the muscular branch, which extends into the muscles of the thigh.
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- Sciatic nerve. The sciatic supplies nearly the whole of the skin of the leg, the muscles of the back of the thigh, and those of the leg and foot. It is the largest nerve in the body, measuring 2 cm in breadth, and is also the continuation of the flattened back of the sacral plexus. The sciatic nerve passes out of the pelvis through the greater sciatic foramen, below the piriformis muscle.
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Sciatic Nerve: The Largest Nerve The sciatic nerve, less commonly known as the ischiatic nerve, is the largest and thickest nerve in the human body.
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cranial nerve A cranial nerve is a nerve that emerges directly from the brain of vertebrates, as distinct from a spinal nerve, which emerges from the spinal cord. All the cranial nerves, except the vagus nerve, pass through the foramina of the skull to innervate structures in the head, neck, and facial region. The cranial nerves are part of the peripheral nervous system (as distinct from the central nervous system, which consists of the brain and spinal cord).
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- The femoral nerve is the major nerve that serves the tissues of the thigh and leg, including the muscles and skin. While the much larger sciatic nerve also passes through the thigh on its way to the lower leg and foot, only the femoral nerve innervates the tissues of the thigh.