TTU ZOOL 2403 EXAM 3 UPDATED TEST
PAPER SOLVED QUESTIONS FULL
SOLUTION PACK
●● Olfactory pathway.
Answer: odor-olfactory receptors-olfactory nerves-olfactory bulbs-
olfactory tracts-olfactory cortex
●● Gustatory Pathway.
Answer: Taste buds are on the dorsal surface of the tongue
taste-receptors- cranial nerves-medulla-gustatory cortex
●● 6 primary taste sensations.
Answer: sweet
salty
bitter
sour
umami
water
●● Cranial Nerves.
Answer: Facial nerve(CN VII)- anterior 2/3s on tongue
,Glossopharyngeal (CN IX)- posterior 1/3 on tongue
●● 3 Layers of the eyeball.
Answer: Outer layer
Middle Layer
Inner Layer
●● Outer Layer of the Eye.
Answer: Dense connective tissue
1. The Sclera- White sheath protecting eyeball.
2. The Cornea- Transparent anterior continuation of the sclera that
protects the lens. The cornea is avascular and can be transplanted.
●● Middle Layer of the Eye.
Answer: Loose connective tissue
1. Choroid- Contains blood vessels that supply oxygenated nutrients to
the tissue of the eye.
2. Ciliary Body- Anterior continuation of the choroid, contains smooth
muscle called ciliary muscles to control the shape of the lens for
focusing on an object
3. Iris- Gives the eye color, it is composed of smooth muscle which
change the size of the pupil to regulate the amount of light entering the
eye.
,●● Inner Layer.
Answer: Nervous tissue layer
1. Retina- contains photoreceptors associated with optic nerve(CN II)
Rods and Cones are here
●● Rods.
Answer: Receptors activated by dim light
Used for night vision
Black and White vision
Used for peripheral vision
●● Cones.
Answer: Receipts activated by bright light
Used for daylight vision
Color Vision
Used for central vision
●● Posterior Cavity.
Answer: Transparent Gel(99% Water)
Fills 80% of the eyeball
Helps keep the retina in place
Not produced until you are 4-5 Yrs old
, Only 1/2 full by the time you're 70 Yrs old
It is not replaced.
●● Visual Pathways.
Answer: Light-Optic Receptors-Optic Nerves- Optic Chiasm-Thalamus-
Visual Cortex
●● Inferior Rectus.
Answer: Eye looking down- Oculomotor nerve(III)
●● Medial Rectus.
Answer: Eye looking medially- Oculomotor nerve (III)
●● Superior Rectus.
Answer: Eyes looking Up- Oculomotor nerve (III)
●● Lateral Rectus.
Answer: Eye Looking laterally- abducens nerve (VI)
●● Inferior Oblique.
Answer: Eye rolls, looking up, and laterally out-oculomotor nerve(III)
PAPER SOLVED QUESTIONS FULL
SOLUTION PACK
●● Olfactory pathway.
Answer: odor-olfactory receptors-olfactory nerves-olfactory bulbs-
olfactory tracts-olfactory cortex
●● Gustatory Pathway.
Answer: Taste buds are on the dorsal surface of the tongue
taste-receptors- cranial nerves-medulla-gustatory cortex
●● 6 primary taste sensations.
Answer: sweet
salty
bitter
sour
umami
water
●● Cranial Nerves.
Answer: Facial nerve(CN VII)- anterior 2/3s on tongue
,Glossopharyngeal (CN IX)- posterior 1/3 on tongue
●● 3 Layers of the eyeball.
Answer: Outer layer
Middle Layer
Inner Layer
●● Outer Layer of the Eye.
Answer: Dense connective tissue
1. The Sclera- White sheath protecting eyeball.
2. The Cornea- Transparent anterior continuation of the sclera that
protects the lens. The cornea is avascular and can be transplanted.
●● Middle Layer of the Eye.
Answer: Loose connective tissue
1. Choroid- Contains blood vessels that supply oxygenated nutrients to
the tissue of the eye.
2. Ciliary Body- Anterior continuation of the choroid, contains smooth
muscle called ciliary muscles to control the shape of the lens for
focusing on an object
3. Iris- Gives the eye color, it is composed of smooth muscle which
change the size of the pupil to regulate the amount of light entering the
eye.
,●● Inner Layer.
Answer: Nervous tissue layer
1. Retina- contains photoreceptors associated with optic nerve(CN II)
Rods and Cones are here
●● Rods.
Answer: Receptors activated by dim light
Used for night vision
Black and White vision
Used for peripheral vision
●● Cones.
Answer: Receipts activated by bright light
Used for daylight vision
Color Vision
Used for central vision
●● Posterior Cavity.
Answer: Transparent Gel(99% Water)
Fills 80% of the eyeball
Helps keep the retina in place
Not produced until you are 4-5 Yrs old
, Only 1/2 full by the time you're 70 Yrs old
It is not replaced.
●● Visual Pathways.
Answer: Light-Optic Receptors-Optic Nerves- Optic Chiasm-Thalamus-
Visual Cortex
●● Inferior Rectus.
Answer: Eye looking down- Oculomotor nerve(III)
●● Medial Rectus.
Answer: Eye looking medially- Oculomotor nerve (III)
●● Superior Rectus.
Answer: Eyes looking Up- Oculomotor nerve (III)
●● Lateral Rectus.
Answer: Eye Looking laterally- abducens nerve (VI)
●● Inferior Oblique.
Answer: Eye rolls, looking up, and laterally out-oculomotor nerve(III)
