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Lab Final Review 1 (Spine, Nerves, Eyes, Ears)
Spinal cord, nerves and plexuses; external and internal eye and ear
55
Anatomy
Undergraduate 2
12/04/2014

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Term
Spinal Cord
Definition
16-18 in long; made up of the cervical, thoracic and lumbar regions as well as the cauda equina
Term
Cauda Equina
Definition
roots of the lumbar, sacral and coccygeal nerves; AKA "horse's tail"
Term
Spinal Nerves
Definition
paths of communication between the spinal cord and specific regions of the body
Term
Spinal Nerves
Definition
31 pairs; connected to the cord by two bundles of axons called roots
Term
Posterior Root
Definition
contains only sensory axons, conduct impulses from sensory receptors to skin, muscles and organs into the CNS
Term
Anterior Root
Definition
contains motor neuron axons, conduct impulses from the CNS to effectors (muscles and glands); AKA ventral
Term
Posterior Gray Horns
Definition
contain cell bodies and axons of interneurons as well as axons of incoming sensory neurons
Term
Anterior Gray Horns
Definition
contain cell bodies of somatic motor neurons that provide impulses for contraction of skeletal muscles
Term
Lateral Gray Horns
Definition
present only in thoracic and upper lumbar segments; contain autonomic motor neurons that regulate cardiac and smooth muscle and glands
Term
White Matter
Definition
consists primarily of myelinated axons; organized into anterior, lateral and posterior white columns
Term
Central Canal
Definition
located in the center of the gray matter; extends the length of the spine and contains cerebrospinal fluid
Term
Anterior Median Fissure
Definition
one of two grooves that divide the spinal cord into right and left halves; located on the ventral side of the cord
Term
Posterior Median Sulcus
Definition
one of two grooves that divide the spinal cord into right and left halves; located on the dorsal side of the cord
Term
Dorsal Root Ganglion
Definition
a swelling on each posterior root; contains the cell bodies of sensory neurons
Term
Endoneurium
Definition
surrounds individual axons
Term
Perineurium
Definition
surrounds bundles of axons called fascicles; contains blood vessels
Term
Epineurium
Definition
the superficial covering of the entire nerve; contains blood vessels
Term
Plexus
Definition
a branch of spinal nerves that forms a network on either side of the body
Term
Cervical Plexus
Definition
supplies the skin and muscles of the posterior head, neck, upper shoulders and diaphragm; phrenic nerves arise from here
Term
Brachial Plexus
Definition
supplies the upper limbs and several neck and shoulder muscles
Term
Lumbar Plexus
Definition
supplies abdominal wall, external genitals and part of lower limbs; iliingiunal, femoral and obturator nerves arise from here
Term
Lacrimal Apparatus
Definition
a group of glands, ducts, canals and sacs that produce and drain lacrimal fluid (tears)
Term
Lacrimal Canals
Definition
tears pass over the surface of the eyeball through these, allowing the tears to drain into the nasal cavity
Term
Orbicularis Oculi
Definition
muscles around the eyes that close the eyes
Term
Extrinsic Eye Muscles
Definition
muscles that control the movement of the eye
Term
Superior Rectus
Definition
insertion-superior and central part of eyeball
action-moves eyeball upward and medially (add), rotates it medially
Term
Inferior Rectus
Definition
insertion-inferior and central part of eyeball
action-moves eyeball downward, rotates is medially (add)
Term
Lateral Rectus
Definition
insertion-lateral side of eyeball
action-moves eyeball laterally (abd)
Term
Medial Rectus
Definition
insertion-medial side of eyeball
action-moves eyeball medially (add)
Term
Superior Oblique
Definition
action-moves eyeball downward and laterally (abd), rotates it medially
Term
Inferior Oblique
Definition
action-moves eyeball upward and laterally (abd), rotates it laterally
Term
Cornea
Definition
transparent fibrous coat that covers the colored iris
Term
Sclera
Definition
the white of the eye; coat of connective tissue that covers the eyeball except the cornea
Term
Sclera
Definition
gives the eyeball its shape and rigidity, protects inner parts
Term
Pupil
Definition
hole in the center of the iris through which light enters the eyeball
Term
Iris
Definition
colored part of the eyeball; includes circular and radial smooth muscle fibers
Term
Lens
Definition
transparent structure that focuses light rays onto the retina
Term
Retina
Definition
lines the posterior 3/4 of the eyeball and is the beginning of the visual pathway; third and inner coat of eyeball
Term
Optic Disc
Definition
AKA blind spot
Term
Anterior Cavity
Definition
lies anterior to the lens and is filled with aqueous humor
Term
External Ear
Definition
collects sound waves and passes them inward; consists of auricle, external auditory canal and tympanum
Term
Auricle
Definition
part of the ear you can see
Term
External Auditory Canal
Definition
curved tube that extends from the auricle and directs sound waves toward the eardrum
Term
Tympanum
Definition
thin, semitransparent partition between the eac and middle ear; AKA eardrum
Term
Middle Ear
Definition
small, air-filled cavity between eardrum and inner ear; contains auditory ossicles and eustachian tube
Term
Auditory Ossicles
Definition
tiny bones that extend across the middle ear; attached by ligaments; malleus, incus and stapes
Term
Malleus
Definition
hammer
Term
Incus
Definition
anvil
Term
Stapes
Definition
stirrup
Term
Eustachian Tube
Definition
connects the middle ear with the upper part of the throat
Term
Inner Ear
Definition
divided into the outer body labrynth and inner membranous labrynth; includes the oval window, round window, semicircular canals and cochlea
Term
Semicircular Canals
Definition
behind the vestibule; consists of the vertical anterior and posterior and the horizontal lateral
Term
Round Window
Definition
below the oval window
Term
Oval Window
Definition
above the round window
Term
Cochlea
Definition
bony spiral canal that resembles a snail's shell
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