Question

Part a: Name all embryonic germ layers that would have contributed to the tissues visible in the drawing (name which visible tissue would have originated from which germ layer)

Part b: Name the basic tissue types that are present by giving examples

Part c: Name up to three tissues types that are not represented in this drawing (if any are not represented).

Hair shaft -Interfollicular epidermis- Hair folliclé Papillary dermis Sebaceous gland LGR6 LRIG1 PLETI GLI1 LGR5 CD34 Reticular dermis rrector pili uscle Dermal papilla Hypodermis Fig. 1 Mouse back skin. Markers of different epidermal stem cell populations (LGR6, LRIG1, PLETI GLI1, LGR5, and CD34) are shown. LGR6 and LRIG1 are expressed in the hair follicle isthmus, whereas CD34 and LGR5 are bulge markers. The three dermal layers (boxed) are the reticular dermis, papillary dermis, and hypodermis/white adipose tissue. The dermal papilla and arrector pili muscle constitute two specialized populations of dermal mesenchymal cells. The hair is shown in the resting phase of the hair growth cycle. [Redrawn from (60).]

Answer 1

a.

Ectoderm produces Epidermis and associated glands.

Mesoderm forms connective tissue of dermis and hypodermis

b.

Tissues types shown in the image are

1. Epithelial

2. Connective

3. Muscle

4. Nervous

c.

All the four types of tissues are shown in the image (Assuming the star shaped cells are nervous cells)