week 8 Flashcards
afferent nerve for pupillary light reflex
CN II
interneuron pupillary light reflex
pretectal nucleus (midbrain)
efferent pupillary light reflex
CN III (from PN III in midbrain)
efferent organ of pupillary light reflex
constrictor m. of pupil (quick in small animal, slow in large animal)
palpebral reflex afferent nerve
CN V
palpebral reflex interneuron
nucleus of spinal tract of CN V
efferent palpebral reflex
CN VII (medulla)
efferent organ of palpebral reflex
orbicularis oculi m.
corneal reflex afferent nerve
CN V
corneal reflex interneuron
nucleus of spinal tract of CN V
Corneal reflex efferent nerve
CN VII
menace response afferent nerve
CN II, follows pathway to forebrain
menace response interneuron
a lot of interneurons (exchange between CN II and III)
menace response efferent nerve
CN VII
menace response effector organ
Orbicularis oculi m.
menace response is absent in what animals
dogs and cats under 8 weeks and foals under 12 weeks
gag reflex afferent nerve
CNN IX and X by oral or external massage
gag relfex interneuron
exchange interneurons in medulla
gag reflex efferent nerve
CN IX and X; also CN XII phrenic nerve involved
oculocephalic reflex afferent nerve
CN VIII
oculocephalic reflex interneuron
vestibular trigone into medulla (MLF)
oculocephalic reflex efferent nerve
CN III, IV, VI (noraml vestibular nistagmus)
oculocephalic reflex is useful when evaluating
acute head trauma (with PLR)
Trigeminofacial reflex afferent nerve
CN V (touch side of nose, face; flick tactile hairs; inner nose touch hemostats)
trigeminofacial reflex interneuron
pons and medulla
trigeminofacial reflex efferent nerve
CN VII
thoracolaryngeal reflex (slap test) method
during expiration, gently slap just caudal to withers; brief adduction of controlateral arytenoid cartilage; direct observation (endoscope) or via palpation (muscular process)
thoracolaryngeal reflex afferent nerve
dorsal branches of thoracic spinal nn.
thoracolaryngeal reflex interneuron
exchange (interneurons) spinal cord to medulla
thoracolaryngeal reflex efferent nerve
CN X
thoracolaryngeal reflex effector organ
cricoarytenoideus lateralis
dazzle reflex afferent nerve
CN II
dazzle reflex interneuron
tectospinal tract (midbrain to cervical cord)
dazzle reflex efferent nerve
cervical cord LMNs and CN VII (medulla)
