Quiz 3: Sidman (Ch 17) Flashcards
The “ little hills” on the midbrain are called, according to their longitudinal position, the superior and _____ colliculi.
inferior
Uppermost are the left and right _____ior colliculi and below them are the left and right _____ _____. The total number of “little hills” in the midbrain is _____.
superior; inferior colliculi; four
The superior and inferior colliculi lie in the _____ region of the brainstem.
midbrain
Label the structure indicated on this midsagittal view; include the side of the brain in which it is located.
Right superior colliculus
In referring to the cerebral hemispheres, we have indicated “front” with the directional term _____; “rear” with the term _____; “above with the term _____; and “below” with the term _____.
anterior; posterior; superior; inferior
The cerebellum lies _____ior to the medulla, _____, and midbrain portions of the brainstem.
posterior; pons
The two indicated structures are visible on the _____ior surface of the midbrain. Label these two structures.
posterior; superior colliculus (above) inferior colliculus (below)
At the base of each side of the midbrain, _____ior to the colliculi, is a massive white matter structure, the _____ _____.
anterior; basis pedunculi
Corticospinal fibers pass from the internal capsule to the midbrain and pass through the base of the midbrain in the _____ pedunculi.
basis
Label the outlined region just below the thalamus.
Hypothalamus
The internal capsule runs along the _____al boundary of the thalamus and _____us.
lateral; hypothalamus
The midbrain (encircled) lies between the _____ (label it on figure) inferiorly and the thalamus and _____ (label it on figure) superiorly.
pons; hypothalamus
A coronal section at the level indicated would be difficult to use for study of brainstem anatomy because it passes obliquely through the midbrain, _____, and medulla.
pons
Does the cut surface on the right hand figure show the thalamus? _____ Hypothalamus? _____ Midbrain? _____ Pons? _____. Draw a line on the left hand figure to indicate the position of the cut surface of the right hand figure.
Yes; Yes; Yes; No
Line is a vertical slanted slash from left to right
The passage of fibers from the internal capsule to the base of the _____ would be shown well on a myelin-stained coronal section at this level and in sections _____ior to this level.
midbrain; posterior
This section, cut in a plane indicated by the broken line, passes through the thalamus superiorly and through a small portion of the hypothalamus and _____ inferiorly. The white matter indicated by the arrow on the section is just below the internal capsule and barely into the _____ region of the brainstem.
midbrain; midbrain
The corticospinal fibers leave the cerebral hemisphere by passing without interruption from the internal capsule to the basis _____, on the base of the _____. Place an “X” on the basis pedunculi.
pedunculi; midbrain
X on the right of the middle section in dark gray area
In the midbrain, the superior and inferior _____ are gray matter, and the basis pedunculi is _____ matter.
colliculi; white
The two planes of section intersect in the _____ nucleus. Both planes also pass through the _____ _____ of the midbrain, but only the plane transverse to the brainstem passes, at the posterior side of the midbrain, through the _____ _____.
red; basis pedunculi; superior colliculus
The basis pedunculi lies _____ to the colliculi of the midbrain and both anterior and lateral to the _____ nucleus. Encircle the region of the basis pedunculi.
anterior; red
Circle lined part under black circle
In the midbrain, the corticospinal tract passes anterior to the four _____ and to the _____ nucleus.
colliculi; red
Encircle the midbrain region of the brainstem. A line has been drawn on the diagram to indicate a coronal section. Draw an intersecting line to indicate a section transverse to the midbrain, with the intersection in the left superior colliculus.
Circle part over pons
Line from left slanting downward right over circled part
Note the labeled structures on the transverse section. Draw a line through the left hand picture to show the level of the section.
Line slanting from left downward to right over cerebellum and midbrain
Label the three indicated structures. Encircle the labels of the two most anterior structures.
Left blank: Left superior colliculus
Right blank: Right superior colliculus
Middle bottom blank: Red nuclei
Encircled: Left basis pedunculi; Right basis pedunculi
The red nuclei lie _____ior to the colliculi. On both sides of the section, label the red nuclei and superior colliculi.
anterior
Red nuclei are the two circles in middle
Superior colliculi are the two structures directly above the red nuclei
Look at the diagram. The basis pedunculi is part of a larger structure, the _____ _____.
cerebral peduncle
A peduncle is a foot piece (pillar or column) that supports another structure. The _____uncle on each side of the midbrain “holds up” the cerebral hemisphere, which lies in a position _____ior to the midbrain.
peduncle; superior
The portion of the midbrain that holds up the cerebral hemisphere is called the _____ _____ (label it on the figure). The white matter that forms the base of the peduncle is called, in direct Latin translation, the _____ _____ (label it on the figure).
bottom middle blanks: cerebral peduncle
right blanks: basis pedunculi
The basis pedunculi is composed of _____ matter. The whole cerebral peduncle is composed of both _____ and _____ matter. At the posterior side of the section are two “little hills,” the _____ _____.
white; gray; white; superior colliculi
Label the indicated structures.
Top blanks: superior colliculi
Bottom left: Cerebral peduncle
Bottom middle: Red nucleus
Bottom right: Basis pedunculi
