ANAT 261 Lecture Notes - Dense Irregular Connective Tissue, Keratin, Loose Connective Tissue

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peachdeer29

16 Mar 2012

School

McGill University

Department

Anatomy & Cell Biology

Course

ANAT 261

Professor

Jason Young

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Document Summary

The skin is divided into three distinct layers: Epidermis the epidermis is stratified squamous epithelium (keratinized: know this, every word is required for describing an epithelium, so be careful to include it all, even the keratinized". No blood vessels in the epidermis cellular layers of the epidermis: stratum germinativum/basale: single layer of columnar cells innermost layer of epidermal tissue, adjacent to the dermis rests on the basement membrane (bm) *note: in the lab, you can"t see the bm structurally, but you know that it is always present between the epidermis and dermis. Actively dividing to provide the cells for the upper layers: stratum spinosum: polygonal cells with central nuclei. Cells interconnected by desmosomes which appears like little spines: stratum granulosum: squamous (flat) cells. Contain keratohyaline granules: granules are basophilic (give cells dark blue/purple appearance) Cells no longer dividing and are committed to death: stratum corneum: dead squamous cells (no nuclei are present) top layer.

Related Questions

What is the name of the tissue that lies just below thecutaneous membrane, what does it consist of, and what is itsfunction?

	A.	Hypodermis, consists of adipose tissue, supplies nutrients tothe epidermis
	B.	Hyperdermis, consists of adipose tissue, functions to stabilizethe position of the skin while permitting independent movement
	C.	Hypodermis, consists of adipose tissue, functions to stabilizethe position of the skin while permitting independent movement
	D.	Hypodermis, consists of connective tissue, supplies nutrients tothe epidermis

cyanbat514

short answers( Just few words) Basic bio, answer them all and I will rate you

1-What is the most apical stratum of the epidermis? Visceral? Which layer is not present in thick skin?

2-Thick skin has five strata and thin has four, but this is not the primary reason why thick skin is so much thicker than thin skin. What is the primary reason?

3-What is the most abundant cell in the epidermis of your skin? What other cells are located in the epidermis? In which stratum are the cells you identified located?

4-How long does it take a keratinocyte produced in the stratum germinativum to be sloughed off the surface of the epidermis?

5-What does it mean that the epidermis is avascular? Virtually all cells of the human body are within 20 Âµm of a capillary. Do some of the cells of the epidermis fly in the face of this general rule?

cold receptors are located in the

a.) subcutaneous layer

b.) reticular layer of the dermis

c.) stratum basale of the epidermis

d.) dermal papille

e.) hair follicles

salmongoldfish155

ANAT 261 Lecture Notes - Dense Irregular Connective Tissue, Keratin, Loose Connective Tissue

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