Panopto 34: Male reproductive

Question 1

how many germ cell layers are in the tubule wall?

Answer 1

6-7 layers

Question 2

how are germ cells in the wall classified?

Answer 2

based on degree of cellular development: spermatogonia, spermatocytes, and spermatids

Question 3

spermatagonia

Answer 3

single layer of cells that are the youngest and least mature of the germ cells. Found on the basement membrane in between epithelium and lamina propria

Question 4

spermatocytes

Answer 4

2 layers of cells immediately above spermatagonia

Question 5

spermatids

Answer 5

3-4 layers on top of the spermatocytes and the uppermost layer is in the lumen

Question 6

how many kinds of spermatagonia are there? What are they?

Answer 6

3 kinds:
1. Dark type A (Ad)
2. Pale type A (Ap)
3.Type B

Question 7

What is the earliest spermatagonia?

Answer 7

dark type A

Question 8

How do the cells move through the epithelium?

Answer 8

move laterally along the basement membrane, they never leave the basement membrane, very different from the centripital movement we see in other stratified epithelium

Question 9

centripital movement

Answer 9

typical movement. moves away from the basement membrane and towards the surface. Usually occurs in stratified epithelium.

Question 10

what stage of spermatagonia transitions from lateral to centripital movement?

Answer 10

stage 4 when type B divides into the primary spermatocytes.

Question 11

what kind of cells are found in the basal compartment of the seminiferous tubule wall?

Answer 11

spermatagonia as well as primary spermatocytes

Question 12

Does the basal compartment have a distinct boundary?

Answer 12

yes we just cant see it

Question 13

describe dark type A and its division

Answer 13

The first type. The nucleus is going to be finely granule, homogeneous, and basophlic. Function: reserve stem cell for the entire line of stem cells. It sits and waits, but it does divide mitotically (Ad-> Ad + different 2nd cell: pale type A)

Question 14

describe pale type A and its division

Answer 14

The second type. Granular chromatin in Pale type A is not nearly as basophilic as dark type A chromatin but still basophilic; its pale. Divides mitotically and divides multiple consecutive mitotic divisions
Ap -> mitosis -> -> Ap (numerous)

Question 15

How are Type B cells made and describe type B and its division

Answer 15

The third type. Ap -> 2 type B.
Type B: nucleus looks like it belongs to a somatic cell, like its in an interphase state. heterochromatin and euchormatin (a light staining part that is expressed) and a nucleolus. You would never know it was a germ cell.

Question 16

How are primary spermatocytes made?

Answer 16

type B division
the 4th type. Type B -> 2 primary spermatocytes (this is where centripital movement occurs).