where does the long ciliary nerve come from
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Muscles, Nerves, and Blood Vessels in the Human Eye Short posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera at the edge of the optic nerve; they supply the choroid and the rods and cones of the retina. Long posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera to supply the ciliary body and iris.
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- The hypoglossal nerve arises from the hypoglossal nucleus in the medulla oblongata of the brain. It then passes laterally across the posterior cranial fossa, within the subarachnoid space.The nerve exits the cranium via the hypoglossal canal.ig 1.0 – The extracranial anatomical course of the hypoglossal nerve. The hypoglossal nerve arises from the hypoglossal nucleus in the medulla oblongata of the brain. It then passes laterally across the posterior cranial fossa, within the subarachnoid space. The nerve exits the cranium via the hypoglossal canal.
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Optic nerve Optic nerve. The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves.The job of the optic nerve is to transfer visual information from the retina to the vision centers of the brain via electrical impulses. The optic nerve is made of ganglionic cells or nerve cells.It consists of over one million nerve fibers. Our blind spot is caused by the absence of specialized photosensitive (light-sensitive) cells, or photoreceptors, in the part of the retina where the optic nerve exits the eye.he optic nerve is made of ganglionic cells or nerve cells. It consists of over one million nerve fibers. Our blind spot is caused by the absence of specialized photosensitive (light-sensitive) cells, or photoreceptors, in the part of the retina where the optic nerve exits the eye.
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- CN II, the optic nerve, is also a sensory nerve. Visual information from the retina is carried back to the superior colliculus of the midbrain on the optic tract which is immediately below the olfactory tract in the more anterior part of the brain.
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Nerves of the Leg and Foot One of the body's largest and longest nerves is the sciatic nerve. It descends from the sacral plexus through the buttocks and into the thighs to supply nerve impulses to and from the muscles and skin in the hip joints and thighs, the lower legs, feet and most of the skin below the knee.he nerves of the leg and foot arise from spinal nerves connected to the spinal cord in the lower back and pelvis. As these nerves descend toward the thighs, they form two networks of crossed nerves known as the lumbar plexus and sacral plexus.
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- The sural nerve is a purely cutaneous nerve formed by variable contributions from the tibial and peroneal nerve in the popliteal fossa. It typically begins as the medial sural cutaneous nerve formed by the tibial nerve that travels between the two heads of the gastrocnemius muscle. It courses deep to the fascia of the posterior compartment of the leg and then is joined by a peroneal communicating branch and a lateral sural branch from the peroneal nerve at midcalf level.
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- Sacral Rhizotomy. Innervation of bowel, bladder, and sexual organs arrives from the autonomic nervous system via the pelvic splanchnic and hypogastric nerves. Somatic innervation arrives from S2-S4 roots via the pudendal nerves. Fasano’s description of rhizotomy noted sparing of the S2 roots to avoid bladder dysfunction. However, the abnormal reflex arc to the plantar flexors of the foot and ankle (such as the gastrocnemius, soleus, flexor digitorum longus, and flexor hallucis longus) may involve S2 nerve roots.
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- Leaves the brain stem through the middle cerebellar peduncle in a ventrolateral location. Within 1 to 2 cm of the brain stem the trigeminal nerve swells to form the very large trigeminal ganglion. This ganglion lies in a depression in the floor of the middle cranial fossa, lateral to the cavernous venous sinus. As the fibres exit the CN V ganglion, they form three primary divisions: Ophthalmic.
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- The sciatic nerve derives its blood supply from: Inferior gluteal artery via the companion artery of sciatic nerve ; Longitudinal anastomosis at the back of the thigh
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- The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
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Optic nerve Optic nerve. The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves. The job of the optic nerve is to transfer visual information from the retina to the vision centers of the brain via electrical impulses. The optic nerve is made of ganglionic cells or nerve cells. It consists of over one million nerve fibers. Our blind spot is caused by the absence of specialized photosensitive (light-sensitive) cells, or photoreceptors, in the part of the retina where the optic nerve exits the eye.
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- The sciatic nerve is a large nerve that starts in the lower back. 1  It forms near the spine and is made up from branches of the roots of the lumbar spinal nerves. 2  It travels through the pelvis and then deep into each buttock. 3  It then travels down each leg. It is the longest and widest single nerve in the body.
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- 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.he 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.
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The Optic Nerve (CN II) and Visual Pathway The optic nerve is formed by the convergence of axons from the retinal ganglion cells. These cells in turn receive impulses from the photoreceptors of the eye (the rods and cones). After its formation, the nerve leaves the bony orbit via the optic canal, a passageway through the sphenoid bone.
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Trochlear nerve Trochlear nerve. From Wikipedia, the free encyclopedia. The trochlear nerve, also called the fourth cranial nerve or cranial nerve IV, is a motor nerve (a somatic efferent nerve) that innervates only a single muscle: the superior oblique muscle of the eye, which operates through the pulley-like trochlea.he trochlear nerve carries axons of type GSE, general somatic efferent, which innervate skeletal muscle of the superior oblique muscle. The superior oblique muscle ends in a tendon that passes through a fibrous loop, the trochlea, located anteriorly on the medial aspect of the orbit.
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- 98 15.2.1.1.The lateral geniculate nucleus (LGN) . After leaving the eye, the main projection of the optic nerve in humans is to the lateral geniculate nucleus ., located in the thalamus. The lateral geniculate is the first central relay through which visual information passes on the way to the cortex.15.2.1.2. The superior colliculus. The optic nerve sends a branch to the superior colliculus, a center that initiates and regulates reflex orientation movements of the eyes, head and neck.fter leaving the eye, the main projection of the optic nerve in humans is to the lateral geniculate nucleus ., located in the thalamus. The lateral geniculate is the first central relay through which visual information passes on the way to the cortex. 15.2.1.2. The superior colliculus.
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Median nerve 1 1. Recurrent branch to muscles of the thenar compartment (the recurrent branch is also called the million dollar nerve). 2  Here it provides motor innervation to opponens pollicis, abductor pollicis brevis and superficial part of flexor pollicis brevis.he median nerve originates from the lateral and medial cords of the brachial plexus, and has contributions from ventral roots of C5 & C6 (lateral cord) and C8 & T1 (medial cord).
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Parasympathetic Innervation to the Head and Neck Ciliary Ganglion. The ciliary ganglion is located within the bony orbit. It is situated anteriorly to the superior orbital fissure, between the lateral rectus muscle and the optic nerve. Pre-ganglionic fibres: The ciliary ganglion is supplied by fibres from the Edinger-Westphal nucleus (associated with the oculomotor nerve). Post-ganglionic fibres: The parasympathetic fibres leave the ganglion via the short ciliary nerves. These fibres continue into the orbit to innervate structures of the eye.
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Median nerve Median nerve. The median nerve is a nerve in humans and other animals in the upper limb. It is one of the five main nerves originating from the brachial plexus. The median nerve originates from the lateral and medial cords of the brachial plexus, and has contributions from ventral roots of C5-C7(lateral cord) and C8 & T1 (medial cord).
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Optic nerve The optic nerve, also known as cranial nerve II, is a paired nerve that transmits visual information from the retina to the brain. The optic nerve is derived from optic stalks during the seventh week of development and is composed of retinal ganglion cell axons and glial cells.
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Median nerve The median nerve is a nerve in humans and other animals in the upper limb. It is one of the five main nerves originating from the brachial plexus. The median nerve originates from the lateral and medial cords of the brachial plexus, and has contributions from ventral roots of C5 & C6 (lateral cord) and C8 & T1 (medial cord). The median nerve is the only nerve that passes through the carpal tunnel.
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Long ciliary nerves The sympathetic fibers to the dilator pupillae muscle mainly travel in the nasociliary nerve but there are also sympathetic fibers in the short ciliary nerves that pass through the ciliary ganglion without forming synapses.he sympathetic fibers to the dilator pupillae muscle mainly travel in the nasociliary nerve but there are also sympathetic fibers in the short ciliary nerves that pass through the ciliary ganglion without forming synapses.
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How Glaucoma Affects the Optic Nerve What comprises the optic nerve? It is made up of about 1 million small individual thread-like nerve fibers that come from the retina. The fibers bend about 90 degrees as they leave the retina and enter the front of the optic nerve (known as the optic nerve head).
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- The ciliary epithelium forms first (from the rim of the optic cup). Around the 4th month the muscles begin to form from mesenchyme cells outside the cilliary epithelium. Muscles develop from the outside in, meridonal -> radial -> circular. Attachments to the scleral spur at about 7 months.
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Chapter 16: The leg 15-8 and 15-10). Deep to the flexor retinaculum, it divides into the medial and lateral plantar nerves. In addition to the gastrocnemius and plantaris muscles, the tibial nerve supplies the soleus, flexor digitorum longus, flexor hallucis longus and tibialis posterior muscles, as well as the skin of the heel and sole.eep to the flexor retinaculum, it divides into the medial and lateral plantar nerves. In addition to the gastrocnemius and plantaris muscles, the tibial nerve supplies the soleus, flexor digitorum longus, flexor hallucis longus and tibialis posterior muscles, as well as the skin of the heel and sole.
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Ciliary ganglion Ciliary ganglion: parasympathetic ganglion of the oculomotor nerve, located in the posterior part of the orbit between the lateral rectus muscle and the optic nerve; receives preganglionic fibers from the Edinger-Westphal (accessory oculomotor) nucleus of the oculomotor nerve and supplies postganglionic fibers for the ciliary muscle and for the ...