Chapter 21

kyrac1997's version from 2017-04-21 02:37

Section 1

Question Answer
Circular muscles of the pupildecrease size
radial muscles of the pupilincrease size
Why is the optic disc our blindspotit contains only axons. has no receptors
2 layers of the retinapigmented layer contains melanin reflects light. neural layer, photoreceptors and neurons
3 components of the neural layerphotoreceptor layer, bipolar layer, ganglion cells layer

Section 2

Question Answer
Optic nerve1
Optic chiasm2
Optic tract3
Lateral genticulate nucleus of thalamus4
optic radiations5

Section 3

Question Answer
superior coliculi controlsextrinsic eye muscles
Pretectal neclei controlspapillary reflexes

Section 4

Question Answer
External earGather sound waves to turn to vibrations. secreate ear wax
Middle earconduct sound vibrations from eardrum to inner ear
Inner earconverting sound to impluses passed to the brain vie auditory nerve
2 receptors of equilibriummaculae and cristae
Static equilibriumassociated forces: gravity, linear de/acceleration. Receptors: meculae
Dynamic equilibriumassociated forces: rotational forces. receptors: cristae
Describe motion sicknessbrain get information that you are moving and you arent and then you vomit
Describe the structure of the cochleasnail shaped organ. revolves 3x around modiolus

Section 5

Question Answer
equilibrium receptors travel to the brain start atReceptors
3synapse with the vestibular nuclei in the medulla oblongata and pons
After integration info goes through structures starting withCN III IV VI. control and couple eye movements to focus visual field
BCN XI control head and neck movements
CVestibulospinal tract. maintain muscle tone in skeletal muscle
DVentral posterior nucleus of thalamus
EPrimary somatosensory area

Section 6

Question Answer
Auditory pathway starts at organ of corti
3 Axons from CN VII synapse with cochlear nuclei in medulla oblongata
4 some decussate and head to the lateral lemnsicus on the opposite side terminating in the inferior colliculus
5 move from the inferior colliculus to the medial geniculate nucleus in the thalamus
6 from the thalamus to the primary auditory area.
Other axons end in the superior olivary bucleus in the pons on each side.
7 they to the lateral lemniscus on the same side to the inferior colliculus to the primary auditory area (temporal lobe)