OTD 341 Exam 3 Questions and Answers
CN I: Olfactory - Answer-Special Sensory, Responsive to chemoreceptors in the nos,
vulnerable to damage after a TBI
CN II: Optic - Answer-Special Sensory, direct outgrowth of the brain
CN III: Oculomotor - Answer-Somatic Motor, small component of parasympathetic
fibers.
Location: Midbrain
CN IV: Trochlear - Answer-Somatic Motor
Location: Midbrain at the level of superior colliculi
CN V: Trigeminal - Answer-Branchiomeric
Location: Mid Pons
CN VI: Abducens - Answer-Somatic Motor
Location: Caudal Pons
CN VII: Facial - Answer-Branchiomeric
Location: Mid to Caudal Pons
CN VIII: Vestibuloccochlear - Answer-Special Sensory
Formerly called auditory or acoustic nerve
CN XI: Glossopharyngeal - Answer-Branchiomeric
Location: Medulla
CN X: Vagus - Answer-Branchiomeric
Location: Medulla
CN XI: Accessory - Answer-Somatic Motor
Location: very caudal medulla & upper 5 cervical spinal cord segments (anterior horn)
CN XII: Hypoglossal - Answer-Somatic Motor
Location: Medulla
Sclera - Answer-(white outer layer of the eyeball)
Cornea - Answer-Transparent anterior portion of the sclera, lie in front of the iris and
pupil
Choroid - Answer-(middle layer of the eyeball)
, Iris - Answer-Circular structure that forms colored portion of the eye
Pupil - Answer-circular opening in the center of the iris through which light enters
Lens - Answer-(directly posterior to the iris, focuses light rays on the retina) (has ability
to change shape based on how near or far visual stimulus is (accommodation)
Retina - Answer-(inner layer of the eyeball, covers only the posterior half of the inner
eye, direct outgrowth of the diencephalon. Contains sensory receptors for vision
(photoreceptors): rods and cones
Rods & Cones - Answer-Transduce light energy into electrical signals
Rods - Answer-receptors specialized to receive peripheral visual input; function best in
dim light
Cones - Answer-receptors specialized to receive colors and acuity; function best in
bright light
Macula Lutea (macula) - Answer-yellow circular part at the center of the retina important
for central vision
Fovea Centralis (Fovea) means "pit" - Answer-directly in line with our visual axis,
contains primarily cones, area of highest acuity
Optic Disk - Answer-where axons of retinal neurons, called ganglion cell, coverage to
leave the retina to become the optic nerve
Binocular - Answer-Viewed with two eyes
Monocular - Answer-Viewed with one eye
Stereoscopic Vision - Answer-3 - dimensional vision as a product of binocular vision
Retinal Field - Answer-Representation of outside visual field on the retina
Central Visual Field - Answer--Foveal vision, focal vision, or central vision
-Area directly around focal point and area of highest acuity
Peripheral Visual Field - Answer--Areas outside of central visual field; not as good
acuity, but good at movement detection and helps us with balance, movement,
coordination and posture.
Hypothalamus - Answer->inferior to the anterior portion of the thalamus, superior to the
pituitary gland, anterior to the midbrain, and posterior to the optic chiasm
CN I: Olfactory - Answer-Special Sensory, Responsive to chemoreceptors in the nos,
vulnerable to damage after a TBI
CN II: Optic - Answer-Special Sensory, direct outgrowth of the brain
CN III: Oculomotor - Answer-Somatic Motor, small component of parasympathetic
fibers.
Location: Midbrain
CN IV: Trochlear - Answer-Somatic Motor
Location: Midbrain at the level of superior colliculi
CN V: Trigeminal - Answer-Branchiomeric
Location: Mid Pons
CN VI: Abducens - Answer-Somatic Motor
Location: Caudal Pons
CN VII: Facial - Answer-Branchiomeric
Location: Mid to Caudal Pons
CN VIII: Vestibuloccochlear - Answer-Special Sensory
Formerly called auditory or acoustic nerve
CN XI: Glossopharyngeal - Answer-Branchiomeric
Location: Medulla
CN X: Vagus - Answer-Branchiomeric
Location: Medulla
CN XI: Accessory - Answer-Somatic Motor
Location: very caudal medulla & upper 5 cervical spinal cord segments (anterior horn)
CN XII: Hypoglossal - Answer-Somatic Motor
Location: Medulla
Sclera - Answer-(white outer layer of the eyeball)
Cornea - Answer-Transparent anterior portion of the sclera, lie in front of the iris and
pupil
Choroid - Answer-(middle layer of the eyeball)
, Iris - Answer-Circular structure that forms colored portion of the eye
Pupil - Answer-circular opening in the center of the iris through which light enters
Lens - Answer-(directly posterior to the iris, focuses light rays on the retina) (has ability
to change shape based on how near or far visual stimulus is (accommodation)
Retina - Answer-(inner layer of the eyeball, covers only the posterior half of the inner
eye, direct outgrowth of the diencephalon. Contains sensory receptors for vision
(photoreceptors): rods and cones
Rods & Cones - Answer-Transduce light energy into electrical signals
Rods - Answer-receptors specialized to receive peripheral visual input; function best in
dim light
Cones - Answer-receptors specialized to receive colors and acuity; function best in
bright light
Macula Lutea (macula) - Answer-yellow circular part at the center of the retina important
for central vision
Fovea Centralis (Fovea) means "pit" - Answer-directly in line with our visual axis,
contains primarily cones, area of highest acuity
Optic Disk - Answer-where axons of retinal neurons, called ganglion cell, coverage to
leave the retina to become the optic nerve
Binocular - Answer-Viewed with two eyes
Monocular - Answer-Viewed with one eye
Stereoscopic Vision - Answer-3 - dimensional vision as a product of binocular vision
Retinal Field - Answer-Representation of outside visual field on the retina
Central Visual Field - Answer--Foveal vision, focal vision, or central vision
-Area directly around focal point and area of highest acuity
Peripheral Visual Field - Answer--Areas outside of central visual field; not as good
acuity, but good at movement detection and helps us with balance, movement,
coordination and posture.
Hypothalamus - Answer->inferior to the anterior portion of the thalamus, superior to the
pituitary gland, anterior to the midbrain, and posterior to the optic chiasm
