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| the three membranes (the dura mater, arachnoid, and pia mater) that line the skull and vertebral canal and enclose the brain and spinal cord |
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| the tough outermost membrane enveloping the brain and spinal cord. |
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| the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater |
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| Sheep Brain Corpus Collosum |
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| What are the 4 major nerve plexuses? |
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- Cervical
- Brachial
- Lumbar
- Sacral
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| Originates in the neck (C3-C5) and passes down between the lung and heart to reach the diaphragm. It is important for breathing, as it passes motor information to the diaphragm and receives sensory information from it. |
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| Originates from the brachial plexus (upper trunk, posterior division, posterior cord) at the level of the axilla (armpit) and carries nerve fibers from C5 and C6 |
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| Largest nerves in your leg. Located near the groin, it controls the muscles that help straighten your leg and move your hips, and also provides feeling in the lower part of your leg and the front of your thigh. |
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| Nerve extending from the lower end of the spinal cord down the back of the thigh, and dividing above the knee joint |
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the white outer layer of the eyeball. At the front of the eye it is continuous with the cornea
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| the transparent layer forming the front of the eye. |
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| connects the iris to the choroid |
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| Helps to refract light to be focused on the retina |
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| the clear fluid filling the space in the front of the eyeball between the lens and the cornea. |
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| the transparent jellylike tissue filling the eyeball behind the lens. |
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The pigmented vascular layer of the eyeball between the retina and the sclera.
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| a layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed. |
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| an oval yellowish area surrounding the fovea near the center of the retina in the eye. It is the region of greatest visual acuity. |
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| a small depression in the retina of the eye where visual acuity is highest. The center of the field of vision is focused in this region, where retinal cones are particularly concentrated. |
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| each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye. |
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| the raised disk on the retina at the point of entry of the optic nerve, lacking visual receptors and so creating a blind spot. |
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a flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.
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| the dark circular opening in the center of the iris of the eye, varying in size to regulate the amount of light reaching the retina. |
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| the external portion of the ear |
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| The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane |
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| External Acoustic Meatus Diagram |
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| the air-filled central cavity of the ear, behind the eardrum. |
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| a small bone in the middle ear that transmits vibrations of the eardrum to the incus. |
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| a small anvil-shaped bone in the middle ear, transmitting vibrations between the malleus and stapes. |
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| a small stirrup-shaped bone in the middle ear, transmitting vibrations from the incus to the inner ear. |
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| the semicircular canals and cochlea, which form the organs of balance and hearing and are embedded in the temporal bone. |
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| the spiral cavity of the inner ear containing the organ of Corti, which produces nerve impulses in response to sound vibrations. |
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| three fluid-filled bony channels in the inner ear. They are situated at right angles to each other and provide information about orientation to the brain to help maintain balance. |
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| Semicircular Canals Diagram |
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| conveying sensory impulses from the organs of hearing and balance in the inner ear to the brain |
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| Vestibulocochlear Nerve Diagram |
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| an oval opening at the head of the cochlea, connecting the middle and inner ear, through which sound vibrations of the stapes are transmitted |
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| a membrane-covered opening in the inner wall of the middle ear that compensates for changes in cochlear pressure |
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| Pharyngotympanic (auditory) tube |
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| either of the paired tubes connecting the middle ears to the nasopharynx; |
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| Pharyngotympanic (auditory) tube Diagram |
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