What is the function of skin dermal folds?

What is the function of skin dermal folds?

You should notice that the dermis extends up into the epidermis in structures called dermal papillae. These have two functions. First, they help adhesion between the dermal and epidermal layers. Second, in areas of thick skin like this, they provide a large surface area, to nourish the epidermal layer.

What is the stratum granulosum?

The granule cell layer (stratum granulosum) is the next layer (3-5 layers of cells). As the cells move up into this layer, they start to lose their nuclei and cytoplasmic organelles, and turn into the keratinised squames of the next layer. The granules contain a lipid rich secretion, which acts as a water sealant.

What is stratum lucidum function?

It is usually found in the thick skin of the palm of the hand or soles of the feet. The function of it is to protect the areas most common to damages such as palms of the hand, side fingers and the bottoms of the feet. It is usually an extra layer of skin.

What are dermal ridges?

[TA] surface ridges of the epidermis of the palms and soles, where the sweat pores open. Synonym(s): cristae cutis [TA], papillary ridges ☆ , epidermal ridges, skin ridges.

What is the papillary dermis?

(PA-pih-LAYR-ee DER-mis) The thin top layer of the dermis (the inner layer of the skin). The papillary dermis has connective tissue and blood vessels that give nutrients to the epidermis (the outer layer of the skin) and that help control the temperature of the skin.

What is the stratum Spinosum?

The stratum spinosum is the layer above the stratum basalis and is typically five to ten cell layers thick. Keratinocytes adhere to each other by desmosomes.

What are lamellar granules?

Lamellar granules (LG), also known as keratinosomes, lamellar bodies, membrane-coating granules, and Odland bodies, are specialized secretory granules of the keratinizing stratified squamous epithelia and are thought to be essential in barrier formation and desquamation (Hayward, 1979;Odland and Holbrook, 1981).

What is the stratum corneum function?

The stratum corneum (SC), the skin’s outermost layer and interface with the outside world is now well recognized as the barrier that prevents unwanted materials from entering, and excessive loss of water from exiting the body.

What is the stratum Basale?

Stratum basale, also known as stratum germinativum, is the deepest layer, separated from the dermis by the basement membrane (basal lamina) and attached to the basement membrane by hemidesmosomes.

Which is the joint that produces the most movement?

The degree and type of movement that can be produced at a synovial joint is determined by its structural type. While the ball-and-socket joint gives the greatest range of movement at an individual joint, in other regions of the body, several joints may work together to produce a particular movement.

Where does flexion and extension take place in the body?

Flexion and Extension Flexion and extension are movements that take place within the sagittal plane and involve anterior or posterior movements of the body or limbs.

How is the movement of a synovial joint determined?

Synovial joints allow the body a tremendous range of movements. Each movement at a synovial joint results from the contraction or relaxation of the muscles that are attached to the bones on either side of the articulation. The degree and type of movement that can be produced at a synovial joint is determined by its structural type.

What are the movements of the scapula and mandible?

Protraction and retraction are anterior-posterior movements of the scapula or mandible. Protraction of the scapula occurs when the shoulder is moved forward, as when pushing against something or throwing a ball. Retraction is the opposite motion, with the scapula being pulled posteriorly and medially, toward the vertebral column.