ch 14 pt 2

Question 1

what is the medulla oblongata

Answer 1

begins at foramen magnum of skull, extends about 3 cm rostrally and ends at a groove just below pons.

contains pyramids (pair of ridges on anterior surface resembling side-by-side baseball bats)

separated by anterior median fissure

Question 2

what four pairs of cranial nerves begin or end in the medulla

Answer 2

VIII (in part), IX, X, and XII

Question 3

alll ________________ connecting brain and spinal cord pass through the medulla

Answer 3

ascending and descending fibers

Question 4

what is the reticular formation

Answer 4

loose network of nuclei extending throughout

the medulla, pons, and midbrain

Contains cardiac, vasomotor, and respiratory centers

Question 5

pons

Answer 5

anterior bulge in brainstem, rostral to medulla

Cerebellar peduncles—thick stalks on posterior pons that connect it (and the midbrain) to the cerebellum
(ascending sensory tracts, descending motor tracts, pathways in and out of cerebellum)

contains cranial nerves 5, 6, 7. and 8

Question 6

what are pons sensory roles and motor roles

Answer 6

Sensory roles: hearing, equilibrium, taste, facial sensations

Motor roles: eye movement, facial expressions, chewing, swallowing, urination, and secretion of saliva and tears

Question 7

reticular formation in pons

Answer 7

contains additional nuclei concerned with sleep, respiration, posture

Question 8

what is within the midbrain

Answer 8

mesencephalon