Loading....
Coupon Accepted Successfully!

Physiology

Open Flashcards

Central Nervous System

Question
7 out of 23
 

Sine qua non for cerebral cortex



A Stellate cells
B Pyramidal cells

C Granular cells
D Basket cells

Ans. B Pyramidal cells

[Sine qua non = indispensable condition or, qualification]

1. Cortical organization (Cerebral cortex)

a. The neocortex is generally arranged in six layersQ

b. The neurons are mostly pyramidal cells with extensive vertical dendritic trees

c. Afferents from the specific nuclei of the thalamus terminate primarily in cortical layer 4 Q, where the non specific afferent are distributed to layers 1 to 4.

2. Histological structures of cerebral cortex:

    1. Most of the cells are three types: -

i. Granular (stellate) cells ii. Fusiform cells and iii. Pyramidal cells

b. Granule cells — short axon function mainly as intracortical interneurons. Some are excitatory (releasing —glutamate) and others are inhibitory (releasing GABA)

c. Pyramidal cells and fusiform cells:

i. They give rise to almost all the output fibers from the cortex.

ii. Pyramidal cells are larger and more numerous than fusiform cells

iii. Pyramidal cell are the source of long large nerve fibers that go all the way to the spinal cord and also give rise to most of the large subcortical association fiber bundles that pass from one major part of the brain to the other.

3. The CEREBELLAR cortex: - Contains only five type of the — neurons: Q

i. Purkinje (among the biggest neuron in the body Q

ii. Granule

iii. Basket

iv. Stellate and

v. Golgi cells

Central Nervous System Flashcard List

23 flashcards
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
21)
22)
23)