Integumentary System Flashcards
Two distinct regions of skin
Outer epidermis and inner dermis
Serves as a major storage site for adipose tissue? Not part of the skin, also called as?
Hypodermis
Subcutaneous tissue
Strata that composes epidermis
Corneum
Lucidum (present only in soles and palms)
Granulosum
Spinosum
Basale
The outermost layer of the skin, which consist of 20 to 30 or more layers of dead squamous cells called keratinocytes. This layer is “waterproof” tough and continuously undergoes sloughing off.
Stratum corneum
Found only in thick skin, contains 3-5 rows of dead, flat keratinocytes
Stratum lucidum
Contains 3-5 rows of flattened, dying keratinocytes. There are no dividing cells found in this layer or in more superficial layers
Stratum granulosum
Composed of 8-10 rows of cells which are mainly keratinocytes that are often seen with thorn-like projections caused by the process of tissue preparation in stained slides.
Stratum spinosum
Deepest layer of the epidermis, also called as stratum germinativum.
Made up of a single row of cells attached to the basement membrane.
In this layers, the cells actively undergo mitotic division to form new keratinocytes.
Stratum basale
The deeper dermis is made up of the _____ and ______.
The________ is composed of areolar connective tissue.
The deeper and much thicker region of the dermis is the_______ which is composed of dense irregular connective tissue.
Papillary layer
Reticular layer
The superficial portion of the hair is called the______ and projects from the surface of the skin.
Shaft
The ______ is found deep into the shaft and penetrates the dermis and sometimes the hypodermis.
Three layers can be identified in the hair and the hair root:
1.
2.
3.
Inner medula
Middle cortex
Outer cuticle
____ are keratinized, tightly packed epidermal cells that cover the dorsal surface of the distal portion of each digit.
Nails
The portion of the nail that is visible is the ______ while the portion that is embedded in the fold of the skin is the ______.
Nail body
Nail root
The portion of the nail that extends past the digit is referred to as the ______.
The half moon-shaped whitish proximal area of the nail is called the ______.
Beneath the free edge is the ______ which secures the nail to the fingertip.
The narrow band of epidermis that adheres to the nail is called the ______
Free edge
Lunula
Hyponychium
Eponychium
The skin is equipped with different exocrine glands. These include mammary glands, ceruminous glands, sebaceous glands, and sweat glands. Sweat glands are also termed as ______ glands, which have two types: ______ and ______
______ much more coomon
______ are so called odoriferous glands as they are known to produce malodorous sweat.
sudoriferous
Eccrine
Apocrine
