Lab 7 - BS cross sections

Question 1

mid medulla - Lateral or Accessory Cuneate nucleus

Answer 1

Serves as synapse site for first order neuron of Cuneocerebellar tract

Question 2

mid medulla - Internal arcuate fibers

Answer 2

Arcuate fibers are the 2nd order neurons of DCML tract leaving the dorsal column nuclei and crossing to the contralateral medulla

Question 3

mid medulla - medial lemniscus

Answer 3

crossed DCML fiber all go together

Question 4

mid medulla - Medial longitudinal fasciculus (MLF)

Answer 4

White matter pathway that contains descending vestibular information and ascending conjugate gaze control

Question 5

mid medulla - Trigeminothalamic tract

Answer 5

Crossed tract carrying ascending sensory information from the face

Question 6

mid medulla - Spinal trigeminal nucleus and tract

Answer 6

Associated with pain & temp info from face

Question 7

mid medulla - Spinothalamic tract

Answer 7

carries ascending sensory information regarding pain and temperature from the body to the cerebral cortex

Question 8

mid medulla - Pyramids/corticospinal tract

Answer 8

lateral - serving limb muscles; ALSO enables fractionation of movement (fine motor control/coordinated mvmt) of fingers/hand/UE, and modulate sensory info.

Question 9

mid medulla - Solitary nucleus/tract

Answer 9

Taste post. 1/3 tongue (CN 9)

Question 10

mid medulla - Nucleus ambiguus

Answer 10

Motor functions of CN 9 & 10

Question 11

mid medulla - Obex

Answer 11

Region of the median aperture closest to the 4th ventricle

Question 12

mid medulla - Inferior (principal) olivary nucleus

Answer 12

gives rise to climbing fibers to cerebellum, nucleus is deep to external olive

Question 13

mid medulla - Reticular formation

Answer 13

Diffuse nuclei throughout regions of the brainstem, serve variety of functions (ie. Reticulospinal tracts, pain modulation, cardiac/pulmonary functions)

Question 14

Rostral medulla - Descending sympathetic fibers

Answer 14

Associated with pupillary dilation, elevation of eyelid, and sweating to face; ipsilateral impact is lesioned

Question 15

Rostral medulla - dorsal and ventral cochlear nuclei

Answer 15

Associated with aspects of hearing

Question 16

Cerebellum - Fastigial nucleus

Answer 16

Vermal region, associated with spinocerebellum

Question 17

Cerebellum - Interposed nucleus (globose, emboliform)

Answer 17

Paravermal region; associated with spinocerebellum

Question 18

Cerebellum - Dentate Nucleus

Answer 18

Cerebellar hemispheres; associated with cerebrocerebellum

Question 19

Cere - Nodulus of cerebellum
Tonsils of cerebellum

Answer 19

Part of flocculonodular lobe

Question 20

Facial colliculus

Answer 20

Externally located (deep is abducens nucleus and facial nerve)

Question 21

Reticular formation

Answer 21

Collection of diffuse nuclei located in the towards the posteriomedial region of the medulla, pons, and midbrain

Question 22

Pontine nuclei

Answer 22

Receive information from cortex and relays the information to the cerebellum via cerebropontocerebellar fibers

Question 23

Pontocerebellar axons

Answer 23

Relays information from pontine nuclei to contralateral cerebellum through the MCP

Question 24

Pulvinar nuclear complex

Answer 24

The most posterior nucleus of thalamus; associated with visuomotor behaviors, body awareness/attention

Question 25

Medial and lateral geniculate n.

Answer 25

the specific thalamic nuclei that relay the auditory and optic pathways

Question 26

Periaqueductal grey (PAG)

Answer 26

Gray matter surrounding cerebral aqued., assoc w pain mod

Question 27

Edinger-Westphal nucleus

Answer 27

Gives rise to pre-ganglionic parasympathetic fibers associated with pupillary constriction of the eye

Question 28

Substantia nigra

Answer 28

Source of dopaminergic fibers