Where is the reticular lamina located?

The reticular membrane (RM, also called reticular lamina or apical cuticular plate) is a thin, stiff lamina that extends from the outer hair cells to the Hensen’s cells.

What is the reticular lamina?

Medical Definition of reticular lamina

: a thin extracellular layer that sometimes lies below the basal lamina, is composed chiefly of collagenous fibers, and serves to anchor the basal lamina to underlying connective tissue.

Where is reticular membrane?


in the ear, a stiff membrane in the organ of Corti that forms a division between endolymph and perilymph, which differ in their ionic composition. Some of the hair cells of the stereocilia make contact with the reticular membrane. Also called reticular lamina.

What is reticular lamina produced by?


the reticular lamina is produced by fibroblasts of the underlying connective tissue and contains fibrillar collagen.

Where are hair cells located in the ear?


In mammals, the auditory hair cells are located within the spiral organ of Corti on the thin basilar membrane in the cochlea of the inner ear. They derive their name from the tufts of stereocilia called hair bundles that protrude from the apical surface of the cell into the fluid-filled cochlear duct.

What is basal and reticular lamina?

The main components of basal lamina are type 4 collagen, the glycoproteins laminin and entacin, and proteoglycans. Reticular lamina is fromed by reticular fibers , as the name suggests. The reticular lamina is usually thicker than the basal lamina. Some facts on the basement membrane : slideplayer.com.

What is fibrous lamina?

The nuclear fibrous lamina, a structure of unknown function, is situated at the nuclear periphery directly apposed to the inner nuclear membrane. Although it has been well described in invertebrate and many non-human vertebrate cells, its occurrence in human tissue has not been emphasized.

What is the basal lamina and basement membrane?

The basement membrane, or basal lamina, is a sheet of proteins and other substances to which epithelial cells adhere and that forms a barrier between tissues. Once tumours are able to break through this membrane, cancerous cells not only invade surrounding tissue substances…

Is reticular connective tissue?

Reticular tissue, a type of loose connective tissue in which reticular fibers are the most prominent fibrous component, forms the supporting framework of the lymphoid organs (lymph nodes, spleen, tonsils), bone marrow and liver.

Where is the organ of Corti located?


The Organ of Corti is an organ of the inner ear located within the cochlea which contributes to audition. The Organ of Corti includes three rows of outer hair cells and one row of inner hair cells.

Are there hair cells in the cochlea?

The cochlear hair cells in humans consist of one row of inner hair cells and three rows of outer hair cells (see Figure 13.4). The inner hair cells are the actual sensory receptors, and 95% of the fibers of the auditory nerve that project to the brain arise from this subpopulation.

Is the cochlea in the inner ear?

The inner ear has two main parts. The cochlea , which is the hearing portion, and the semicircular canals is the balance portion. The cochlea is shaped like a snail and is divided into two chambers by a membrane.

Where is the utricle and saccule located?

inner ear

The utricle is a small membranous sac (part of the membranous labyrinth) and paired with the saccule lies within the vestibule of the inner ear. It has an important role in orientation and static balance, particularly in horizontal tilt.

Why is the reticular lamina important?

These sub-basal lamina fibroblasts lie in close proximity to bronchial epithelial cells, and are thought to be the primary elements of the fibroproliferative machinery responsible for matrix overproduction. In addition, thickening of the subepithelial basement membrane itself is well documented.

What does the reticular lamina contains?

The reticular lamina contains collagen and elastin and is secreted by connective tissue fibroblasts. The reticular lamina and the basal lamina together constitute the so-called ‘basement membrane’ (a term better avoided).

What means reticular?

1. having the form of a net; netlike. 2. intricate or entangled.

What is the function of basal lamina?

Functions of the basal lamina.

The basal lamina provides support to the overlying epithelium, limits contact between epithelial cells and the other cell types in the tissue and acts as a filter allowing only water and small molecules to pass through.

Where is the junctional epithelium located?

gingival sulcus

The junctional epithelium is the epithelium which is located at the base of the gingival sulcus.

Where does basal lamina come from?

The basal lamina is a layer of extracellular matrix secreted by the epithelial cells, on which the epithelium sits. It is often incorrectly referred to as the basement membrane, though it does constitute a portion of the basement membrane.

What type of collagen is found in the basal lamina?

collagen type I

Basal lamina is composed of collagen type I and III-VI (Tateya et al., 2006), two glycoproteins (laminin and entactin) and the proteoglycan perlecan (Nicolai et al., 1990; Benninger et al., 1996; Alberts et al., 2008).

Is basal lamina thicker than basement membrane?

The strength of this connection is important for development and growth. Many textbooks do not distinguish between the basal lamina as described and the basement membrane, a thicker layer which includes the basal lamina and extracellular components of the underlying connective-tissue matrix.

Is the basal lamina connective tissue?

The basal lamina is an extracellular scaffold positioned between parenchymal cells and connective tissue. Parenchymal cells attach to one of its surfaces and the other is anchored to connective tissue.

What’s the difference between basement membrane and basal lamina?

The basal lamina is composed of lamina densa and lamina lucida whereas the basement membrane is composed of lamina densa and lamina reticularis; hence, the basement membrane includes only a portion of basal lamina, and including a layer not found in basal lamina.

Is lamina propria same as basement membrane?

The lamina propria forms the connective tissue core of the villi and surrounds the crypt epithelium. The crypt and villus epithelial cells and the lamina propria are separated by a distinct basement membrane composed of an ultrastructurally apparent basal lamina and a deeper network of collagenous fibers.

Where is simple squamous epithelium found?

Simple squamous epithelia are found lining the cavities of the body including the pericardial, pleural, and peritoneal cavities, or in areas where passive diffusion occurs, such as glomeruli in the kidney and alveoli in the respiratory tract.

Where else is simple squamous tissue found in the body?

Simple Squamous

This epithelial type is found in the walls of capillaries, linings of the pericardium, and the linings of the alveoli of the lungs.

Where stratified squamous epithelium is found?

Stratified squamous epithelia are found in nearly every organ system where the body comes into close contact with the outside environment – from the skin to the respiratory, digestive, excretory and reproductive systems. They also protect the body from desiccation and water loss.

Where is simple squamous epithelium found in the body quizlet?

Simple squamous epithelium is located in the air sacs of the lungs.