Quiz 3: Sidman (Ch 17)

Question 1

The “ little hills” on the midbrain are called, according to their longitudinal position, the superior and _____ colliculi.

Answer 1

inferior

Question 2

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 _____.

Answer 2

superior; inferior colliculi; four

Question 3

The superior and inferior colliculi lie in the _____ region of the brainstem.

Answer 3

midbrain

Question 4

Label the structure indicated on this midsagittal view; include the side of the brain in which it is located.

Answer 4

Right superior colliculus

Question 5

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 _____.

Answer 5

anterior; posterior; superior; inferior

Question 6

The cerebellum lies _____ior to the medulla, _____, and midbrain portions of the brainstem.

Answer 6

posterior; pons

Question 7

The two indicated structures are visible on the _____ior surface of the midbrain. Label these two structures.

Answer 7

posterior; superior colliculus (above) inferior colliculus (below)

Question 8

At the base of each side of the midbrain, _____ior to the colliculi, is a massive white matter structure, the _____ _____.

Answer 8

anterior; basis pedunculi

Question 9

Corticospinal fibers pass from the internal capsule to the midbrain and pass through the base of the midbrain in the _____ pedunculi.

Answer 9

basis

Question 10

Label the outlined region just below the thalamus.

Answer 10

Hypothalamus

Question 11

The internal capsule runs along the _____al boundary of the thalamus and _____us.

Answer 11

lateral; hypothalamus

Question 12

The midbrain (encircled) lies between the _____ (label it on figure) inferiorly and the thalamus and _____ (label it on figure) superiorly.

Answer 12

pons; hypothalamus

Question 13

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.

Answer 13

pons

Question 14

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.

Answer 14

Yes; Yes; Yes; No
Line is a vertical slanted slash from left to right

Question 15

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.

Answer 15

midbrain; posterior

Question 16

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.

Answer 16

midbrain; midbrain

Question 17

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.

Answer 17

pedunculi; midbrain
X on the right of the middle section in dark gray area

Question 18

In the midbrain, the superior and inferior _____ are gray matter, and the basis pedunculi is _____ matter.

Answer 18

colliculi; white

Question 19

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 _____ _____.

Answer 19

red; basis pedunculi; superior colliculus

Question 20

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.

Answer 20

anterior; red
Circle lined part under black circle

Question 21

In the midbrain, the corticospinal tract passes anterior to the four _____ and to the _____ nucleus.

Answer 21

colliculi; red

Question 22

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.

Answer 22

Circle part over pons
Line from left slanting downward right over circled part

Question 23

Note the labeled structures on the transverse section. Draw a line through the left hand picture to show the level of the section.

Answer 23

Line slanting from left downward to right over cerebellum and midbrain

Question 24

Label the three indicated structures. Encircle the labels of the two most anterior structures.

Answer 24

Left blank: Left superior colliculus
Right blank: Right superior colliculus
Middle bottom blank: Red nuclei

Encircled: Left basis pedunculi; Right basis pedunculi

Question 25

The red nuclei lie _____ior to the colliculi. On both sides of the section, label the red nuclei and superior colliculi.

Answer 25

anterior
Red nuclei are the two circles in middle
Superior colliculi are the two structures directly above the red nuclei

Question 26

Look at the diagram. The basis pedunculi is part of a larger structure, the _____ _____.

Answer 26

cerebral peduncle

Question 27

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.

Answer 27

peduncle; superior

Question 28

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).

Answer 28

bottom middle blanks: cerebral peduncle
right blanks: basis pedunculi

Question 29

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 _____ _____.

Answer 29

white; gray; white; superior colliculi

Question 30

Label the indicated structures.

Answer 30

Top blanks: superior colliculi
Bottom left: Cerebral peduncle
Bottom middle: Red nucleus
Bottom right: Basis pedunculi