Stratum Corneum

Location: The stratum corneum is the epidermis’ outermost layer (skin).
Function: Prevents unwanted materials from entering and loss of water from exiting the body.

Location: It is found on the palms of the hands and the soles of the feet.
Function: Capability of the skin to stretch, degeneration of skin cells, effects of friction in skin

Location: above the stratum spinosum and below the stratum corneum (stratum lucidum on the soles and palms)
Function: Act as a transitional layer where keratinocyte skin cells develop into their final form and die

Location: The stratum spinosum (also known as the spinous layer or prickly cell layer) is an epidermal layer that lies between the stratum granulosum and the stratum basale.
Function: Responsible for skin’s strength and flexibility

Location: The basement membrane (basal lamina) separates the dermis from the lowest layer, which is linked to the basement membrane by hemidesmosomes.
Function: Proliferation and attachment of the epidermis to the dermis

Nail Body
Location: Nails
Function: The sensitive tips of fingers and toes are protected by nails.

Epicardium

Location: Outer layer. In the zebrafish heart, the epicardium is a serous, nonmuscular membrane that surrounds the heart and is found close to the compact myocardium.
Function: Prevent excess expansion or movement of the heart

Location: Middle layer of the heart.
Function: Initiates contraction driving the cardiac cycle

Location: The endocardium is the innermost layer of the heart
Function: lines the cavities and valves.