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originates in the neck (C3-C5) and passes down between the lung and heart to reach the diaphragm
Cervical Plexus |
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originates from the brachial plexus, carrying fibers from the ventral roots of spinal nerves C5, C6, C7, C8 & T1
provide motor innervation to the dorsal arm muscles
extrinsic extensors of the wrists and hands |
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originates from the lateral and medial cords of the brachial plexus
anterior part of arm, forearm, and hand |
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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
originates from the C8-T1 nerve roots
form part of the medial cord of the brachial plexus |
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nerve in the thigh that supplies skin on the upper thigh and inner leg, and the muscles that extend the knee
the largest branch of the lumbar plexus |
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part of the lumbar plexus
branch of femoral nerve that goes to the lower leg and ankle
sensory nerve |
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contains fibers from both the anterior and posterior divisions of the lumbosacral plexus
formed from the L4 to S3 segments
the largest nerve in the human body
supplies sensation to the skin of the foot, as well as the entire lower leg (except for its inner side |
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the larger terminal branch of the sciatic nerve
Innervates the skin of the posterolateral side of the leg, lateral side of the foot, and the sole of the foot
part of the sacral plexus |
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a nerve in the lower leg that provides sensation over the posterolateral part of the leg and the knee joint
the smaller terminal branch of the sciatic nerve
also called the common peroneal nerve |
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| the main nerve of the lateral compartment of the leg |
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the nerve of the anterior compartment of the leg and the dorsum of the foot
one of the terminal branches of the common peroneal nerve |
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| Sympathetic Trunk and Ganglia |
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a paired bundle of nerve fibers that run from the base of the skull to the coccyx
It allows nerve fibres to travel to spinal nerves that are superior and inferior to the one in which they originated |
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| Sympathetic Trunk and Ganglion |
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| interfaces with parasympathetic control of the heart, lungs, and digestive tract |
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| Extrinsic Eye Muscles Function |
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| Sclera Description and Function |
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| outer pink/red; to protect and support the eye and maintain its shape |
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| Choroid Layer Description and Function |
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| vascular layer containing blood vessels that nourishes the eye wall |
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| Retina Description and Function |
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| contains rods and cones that are sensitive to light and converts the light stimulation to nerve impulses |
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| Cornea Description and Function |
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| front, clear area; functions to protect the front of the eye and bend light for focusing |
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| Ciliary Body Description and Function |
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| purple ridges with black underneath them; contains muscles that pull on the lens to change its shape for focusing |
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| Iris Description and Function |
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| contains muscles that contract and relax to change the diameter of the pupil; variable in color |
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| Pupil Description and Function |
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| opening in the middle of the iris through which light passes to enter the eye |
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| Lens Description and Function |
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| changes shape for focusing on objects closer than 20 feet |
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| Anterior Cavity Description and Function |
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| space between cornea and lens which contains the Aqueous Humor |
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| Posterior Cavity Description and Function |
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| space behind the lens that contains the vitreous humor |
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| help maintain the shape of the eye |
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| Optic Disc Description and Function |
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| "blind spot"; point at which the optic nerve leaves the back of the eye; no light sensitive cells or rods/cones are at this location |
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| Fovea Centralis Description and Function |
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| red depression; point of sharpest vision; image falls on this spot when looking directly at an object; has the highest concentration of cones for very detailed color vision |
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| Optic Nerve Description and Function |
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| comes off the back of the eye; carries nerve impulses to the brain |
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| not found in humans; iridescent layer, which functions to provide the light sensitive retinal cells which a second opportunity for stimulation, thereby enhancing visual sensitivity in low light situations |
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| Ear Ossicles (Malleus, Incus, Stapes) |
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Vestibular Branch of the Vestibulocochlear N
carries equilibrium impulses |
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Cochlear Branch of the Vestibulocochlear N
carries auditory impulses |
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