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Definition
| 16-18 in long; made up of the cervical, thoracic and lumbar regions as well as the cauda equina |
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Definition
| roots of the lumbar, sacral and coccygeal nerves; AKA "horse's tail" |
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| paths of communication between the spinal cord and specific regions of the body |
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Definition
| 31 pairs; connected to the cord by two bundles of axons called roots |
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Term
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Definition
| contains only sensory axons, conduct impulses from sensory receptors to skin, muscles and organs into the CNS |
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Term
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Definition
| contains motor neuron axons, conduct impulses from the CNS to effectors (muscles and glands); AKA ventral |
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Definition
| contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons |
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Definition
| contain cell bodies of somatic motor neurons that provide impulses for contraction of skeletal muscles |
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Definition
| present only in thoracic and upper lumbar segments; contain autonomic motor neurons that regulate cardiac and smooth muscle and glands |
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Definition
| consists primarily of myelinated axons; organized into anterior, lateral and posterior white columns |
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Definition
| located in the center of the gray matter; extends the length of the spine and contains cerebrospinal fluid |
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Definition
| one of two grooves that divide the spinal cord into right and left halves; located on the ventral side of the cord |
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Definition
| one of two grooves that divide the spinal cord into right and left halves; located on the dorsal side of the cord |
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Definition
| a swelling on each posterior root; contains the cell bodies of sensory neurons |
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Term
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Definition
| surrounds individual axons |
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Term
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Definition
| surrounds bundles of axons called fascicles; contains blood vessels |
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Term
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Definition
| the superficial covering of the entire nerve; contains blood vessels |
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Definition
| a branch of spinal nerves that forms a network on either side of the body |
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Definition
| supplies the skin and muscles of the posterior head, neck, upper shoulders and diaphragm; phrenic nerves arise from here |
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Definition
| supplies the upper limbs and several neck and shoulder muscles |
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Definition
| supplies abdominal wall, external genitals and part of lower limbs; iliingiunal, femoral and obturator nerves arise from here |
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Definition
| a group of glands, ducts, canals and sacs that produce and drain lacrimal fluid (tears) |
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Definition
| tears pass over the surface of the eyeball through these, allowing the tears to drain into the nasal cavity |
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Definition
| muscles around the eyes that close the eyes |
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Definition
| muscles that control the movement of the eye |
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Term
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Definition
insertion-superior and central part of eyeball
action-moves eyeball upward and medially (add), rotates it medially |
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Definition
insertion-inferior and central part of eyeball
action-moves eyeball downward, rotates is medially (add) |
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Definition
insertion-lateral side of eyeball
action-moves eyeball laterally (abd) |
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Definition
insertion-medial side of eyeball
action-moves eyeball medially (add) |
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Term
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Definition
| action-moves eyeball downward and laterally (abd), rotates it medially |
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Term
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Definition
| action-moves eyeball upward and laterally (abd), rotates it laterally |
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Term
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Definition
| transparent fibrous coat that covers the colored iris |
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Term
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Definition
| the white of the eye; coat of connective tissue that covers the eyeball except the cornea |
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Term
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Definition
| gives the eyeball its shape and rigidity, protects inner parts |
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Term
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Definition
| hole in the center of the iris through which light enters the eyeball |
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Definition
| colored part of the eyeball; includes circular and radial smooth muscle fibers |
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Definition
| transparent structure that focuses light rays onto the retina |
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Term
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Definition
| lines the posterior 3/4 of the eyeball and is the beginning of the visual pathway; third and inner coat of eyeball |
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Definition
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Definition
| lies anterior to the lens and is filled with aqueous humor |
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Definition
| collects sound waves and passes them inward; consists of auricle, external auditory canal and tympanum |
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Definition
| part of the ear you can see |
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Definition
| curved tube that extends from the auricle and directs sound waves toward the eardrum |
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Definition
| thin, semitransparent partition between the eac and middle ear; AKA eardrum |
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Term
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Definition
| small, air-filled cavity between eardrum and inner ear; contains auditory ossicles and eustachian tube |
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Definition
| tiny bones that extend across the middle ear; attached by ligaments; malleus, incus and stapes |
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Definition
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Definition
| connects the middle ear with the upper part of the throat |
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Definition
| divided into the outer body labrynth and inner membranous labrynth; includes the oval window, round window, semicircular canals and cochlea |
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Definition
| behind the vestibule; consists of the vertical anterior and posterior and the horizontal lateral |
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| bony spiral canal that resembles a snail's shell |
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