Module 5 Flashcards
What alternate names for the precentral gyrus?
primary motor cortex (last area that process the signal before it leaves the cortex.)
Brodmann’s Area 4
M1
What area is the origin of the corticospinal tract?
the precentral gyrus.
True or false. Different points in the precentral gyrus correspond to different points in the body.
True.
True or false. the size of the precentral gyrus is proportional to size of the organ.
False. It’s proportional to complexity of movement by the given part of the body (biggest area is speech, then fingers, very small amount to the trunk.)
What is a homunculus?
body model in which body parts are built to correspond to the amount of cortex devoted to that body part.
What is the difference between the motor and sensory homunculus?
the motor homunculus lacks genitalia.
The corticospinal tract are composed of what kind of cells?
cells of Betz (pyramidal) who have their origin in layer five of the cortex.
What is directly behind the Rolandic fissure?
the post central gyrus
What are other names of the postcentral gyrus?
Brodmann’s area 3-1-2
Primary somatosensory cortex
S1
True or false. The somatosensory cortex mirrors the motor cortex in terms of which nerves are where.
True.
Where is the superior temporal gyrus?
right underneath the Sylvian fissure, most superior of the Temporal lobe.
What does the superior temporal gyrus do?
Heschl’s gyrus is located through the middle of the brain in the superior gyrus. .
Posterior quarter of temporal gyrus is Wernicke’s Area.
Wernicke’s Area is important for…
Language comprehension.
What is Heschl’s gyrus responsible for?
This is the primary auditory cortex. It is mapped by frequency with tonotonic representation, with low tones toward the outside (lateral) and higher tones near the middle of the brain (median)
What are other names of Heschl’s gyrus?
primary auditory area
Brodmann’s area 41 and 42
