What is the main function of the reticular layer?
What is the main function of the reticular layer?
The reticular layer is denser than the papillary dermis, and it strengthens the skin, providing structure and elasticity. It also supports other components of the skin, such as hair follicles, sweat glands, and sebaceous glands.
What is the reticular layer?
(reh-TIH-kyoo-ler DER-mis) The thick bottom layer of the dermis (the inner layer of the skin). The reticular dermis has blood vessels and connective tissue that supports the skin. Hair follicles, oil and sweat glands, and other structures are also found in the reticular dermis.
What is the superficial reticular dermis?
The reticular dermis is the lower layer of the dermis, found under the papillary dermis, composed of dense irregular connective tissue featuring densely-packed collagen fibers. It is the primary location of dermal elastic fibers. The reticular region is usually much thicker than the overlying papillary dermis.
What is the subcutaneous layer?
Subcutaneous tissue is the deepest layer of your skin. It’s made up mostly of fat cells and connective tissue. The majority of your body fat is stored here. The subcutaneous layer acts as a layer of insulation to protect your internal organs and muscles from shock and changes in temperature.
What cells are in the reticular layer?
the reticular layer: The deepest layer of the dermis. hypodermis: A subcutaneous layer of loose connective tissue containing fat cells, lying beneath the dermis. the dermis: The layer of skin underneath the epidermis. the papillary layer: The most superficial layer of the dermis.
What is the reticular formation?
The brainstem reticular formation (RF) represents the archaic core of those pathways connecting the spinal cord and the encephalon. It subserves autonomic, motor, sensory, behavioral, cognitive, and mood-related functions.
Why is it called reticular layer?
The inner, thicker reticular layer (from the Latin word rete for “net”) is made up of dense, irregular connective tissue containing interlacing bundles of collagenous and elastic fibers that form the strong, resistant layer used to make leather and suede from animal hides.
How deep is the reticular dermis?
2 mm
From the outer surface down, the main layers are the stratum corneum (10–15 μm), the viable epidermis (100–150 μm), dermis (subdivided into the papillary and reticular dermis, ≈2 mm), and hypodermis.
What are the dermis layers?
The dermis has connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. It is made up of a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis. Anatomy of the skin, showing the epidermis, dermis, and subcutaneous tissue.
How deep is a subcutaneous injection?
You may give an injection within the following area: below the waist to just above the hip bone and from the side to about 2 inches from the belly button.
Which layer of skin is best for subcutaneous injection?
The location of injection is important for subcutaneous injections. The drug needs to be injected into the fatty tissue just below the skin. Some areas of the body have a more easily accessible layer of tissue, where a needle injected under the skin will not hit muscle, bone, or blood vessels.
Is the reticular layer vascular?
B. Reticular Layer: Beneath the papillary layer is a thicker layer of dense irregular connective tissue. Also richly vascularized, this layer contains many arteriovenous anastomoses, or shunts, that control the amount of blood reaching the papillary capillaries and thus aid in regulating heat loss and blood pressure.
Where are the papillary dermis and reticular dermis located?
The dermis underlies the epidermis (Fig. 77.1). The dermis is divided into two regions: the papillary dermis, which lies immediately beneath the epidermis, and the deeper reticular dermis. The papillary dermis is composed of loose connective tissue and form papillae that intertwine with the rete ridges of the epidermis.
Is the reticular layer thicker than the papillary layer?
The reticular layer is subjacent to the papillary layer. It is thicker than the capillary layer and has fewer capillaries. In addition to fibroblasts, mast cells that release histamine in allergic reactions are present in the dermis along with tissue macrophages (phagocytic cells) and fat cells.
What is the edema of the papillary dermis?
In early urticarial lesions there is marked edema of the papillary dermis and a superficial and mid-dermal infiltrate of lymphocytes, histiocytes, and eosinophils. The infiltrate is predominantly perivascular in location. Overlying the tips of the dermal papillae there is often focal spongiosis and, sometimes, necrosis of basal keratinocytes.
Is the papillary dermis similar to healthy skin?
At a depth of 170 μm from the skin surface, dermis starts having a similar morphology with respect to healthy skin. However, the fine collagen network of interwoven curly fibers below the dermo–epidermal junction that is seen in healthy skin is not visible in psoriatic lesions.