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Red arrows indicate secreted lamellar bodies, and green arrows indicate lamellar bodies in the cytoplasm. Scale bar = 200 nm. In cell biology, lamellar bodies (otherwise known as lamellar granules, membrane-coating granules (MCGs), keratinosomes or Odland bodies) are secretory organelles found in type II alveolar cells in the lungs, and in keratinocytes in the skin.
Lamella, in cell biology, is also used to describe the leading edge of a motile cell, of which the lamellipodia is the most forward portion. [5] The lipid bilayer core of biological membranes is also called lamellar phase. [6] Thus, each bilayer of multilamellar liposomes and wall of a unilamellar liposome is also referred to as a lamella.
They contain a highly insoluble cornified envelope within the plasma membrane, and lipids (fatty acids, sterols and ceramides) released from lamellar bodies within the epidermis. The corneocytes are interlocked with each other and organized as vertical columns of 10–30 cells to form the stratum corneum. [2]
Lamella (cell biology): (i) part of a chloroplast (thin extension of thylakoid joining different grana) (ii) the leading edge of motile cells, containing the lamellipodia; Lamella, a group of land crabs in the family Gecarcinucidae; Uroleptus lamella, a species of protozoans
Annulate lamella is one of the cell membrane classes, occurring as a set of parallel elements with double-walled membranes in the same plane/dimension, just as the nuclear envelope. These lamella have pore complexes which are identical to those of the nuclear envelope.
Lamellar corpuscles, or Pacinian corpuscles or Vater-Pacini corpuscle, are deformation or pressure receptors located in the skin and also in various internal organs. [8] Each is connected to a sensory neuron. Because of its relatively large size, a single lamellar corpuscle can be isolated and its properties studied.
The Pacinian corpuscle (also lamellar corpuscle, or Vater-Pacini corpuscle) [1] is a low-threshold mechanoreceptor responsive to vibration or pressure, found in the skin and other internal organs. [2] In the skin it is one of the four main types of cutaneous receptors.
They are the most numerous cells in the alveoli, yet do not cover as much surface area as the squamous type I cells. [18] Type II cells (granulous pneumocytes) in the alveolar wall contain secretory organelles known as lamellar bodies or lamellar granules, that fuse with the cell membranes and secrete pulmonary surfactant.