Sensory & Nervous Systems

Question 1

Eye: Lateral & Medial Canthi

Answer 1

-the point where the eyelids meet

Question 2

Eye: Conjunctiva

Answer 2

-the special mucous membrane lining the eyelid and the eyeball

Question 3

Eye: Tapetum Lucidum

Answer 3

• specialized reflective area of the choroid, the reason an animals eyes glow at night when light is shined at them
• not present in pigs

Question 4

Eye: Retina

Answer 4

• “nervous coat”
• the inner coat of the eye, functioning in image formation
• contains 3 layers of neurons: photoreceptors, bipolar neurons, and ganglion neurons

Question 5

Eye: Anterior Chamber

Answer 5

-the space between the cornea and the iris

Question 6

Eye: Posterior Chamber

Answer 6

-the space between the iris and the lens

Question 7

Eye: Cornea

Answer 7

• the transparent anterior part of the fibrous coat that lets light into the eyeball
• its collagenous fibres are organized in a series of layers that don’t interfere with the passage of light

Question 8

Eye: Vitreous Humor

Answer 8

-the jelly-like substance that fills the vitreous chamber, maintains the shape of the eye and holds the retina in place

Question 9

Eye: Aqueous Humor

Answer 9

• watery fluid, similar to cerebrospinal fluid, filling the anterior and posterior chambers
• functions to maintain the intraocular pressure and as a nutrient and waste transport medium

Question 10

Eye: Nictitating Membrane

Answer 10

• third eyelid
• fold of the conjunctiva, reinforced by cartilage, located between the eyelids medial angle and the eyeball
• retraction of the eyeball causes the third eyelid to move across and protect the eyeball

Question 11

Eye: Pupil

Answer 11

-the central opening of the iris that lets light into the eye

Question 12

Ear: Pinna

Answer 12

• also called auricle
• the fleshy appendage attached to he side of the skill by muscles and ligaments, making it very mobile
• functions to catch and direct sound waves toward the middle ear (ear drum)

Question 13

Ear: External Auditory Canals

Answer 13

-the passageway from the pinna to the ear drum

Question 14

Ear: Tympanic Membrane

Answer 14

• also called ear drum
• the thin, semitransparent partition between the external auditory meatus and the middle ear
• vibrated by sound waves

Question 15

Nervous System: Brain

Answer 15

• portion of the central nervous system (CNS) contained within the skull
• can be divided into the forebrain, brain stem, vestibular system and cerebellum

Question 16

Nervous System: Spinal Cord

Answer 16

• the long column of nervous tissue located within the vertebral (spinal) canal that, along with the brain makes up the central nervous system (CNS)
• a direct continuation of the caudal brain stem beginning at the level of the foramen magnum

Question 17

Nervous System: Optic Nerve

Answer 17

• the second cranial nerve, it is also a special sensory nerve dealing with vision
• cell bodies are located in the retina of the eye

Question 18

Nervous System: Brachial Plexus

Answer 18

• the network of nerves formed from the ventral branch’s of the last few cervical and first one or two thoracic spinal nerves
• nerves from this branch innervate the intrinsic and some of the extrinsic muscles of the thoracic limb, and the diaphragm

Question 19

Nervous System: Lumbosacral Plexus

Answer 19

-the ventral branches of the lumbar and sacral nerves