MLT GlobeHistopathology: Cells, tissues & basic histology – page 5
88 Histopathology MCQs on Cells, tissues & basic histology with answers and explanations.
The proximal part of the nail plate hidden beneath the proximal nail fold is the:
The nail root lies under the skin fold, arising from the matrix. The lunula is the visible pale crescent; the nail bed lies under the nail plate; the hyponychium is beneath the free edge.
Stratified columnar epithelium, which is uncommon in the body, is characteristically found in the:
Stratified columnar epithelium lines parts of the male urethra and large excretory ducts. The trachea has pseudostratified columnar and the epidermis keratinized stratified squamous epithelium.
The hepatic acinus (of Rappaport), centred on the portal tract supply, is regarded as the liver's:
The acinus is organized around blood flow from terminal portal vessels to central veins, explaining zonal injury patterns. The classic hexagonal lobule is the traditional structural unit.
Type I collagen is the dominant fibre in which tissue?
Type I collagen predominates in dermis, bone and tendon. Basement membranes contain type IV, lymphoid stroma type III (reticulin) and hyaline cartilage type II.
The largest neurons in the cerebral cortex, found in the primary motor area, are:
Betz cells are giant pyramidal cells of layer V of the motor cortex. Purkinje cells are large but located in the cerebellar cortex.
Which structure is NOT found on intestinal absorptive cells by TEM?
Enterocytes have microvilli anchored in a terminal web and form chylomicrons from absorbed fat. Stereocilia occur in the epididymis and inner ear hair cells.
Cement (reversal) lines that outline Haversian systems are a regular feature of:
Cement lines mark the edges of osteons laid down during remodelling of compact bone; woven bone lacks organised osteons.
By electron microscopy, fibres with cross-banding every ~64–67 nm are typical of:
Staggered type I collagen molecules produce a regular banding pattern (classically 64 nm, now ~67 nm). Elastic fibres and type IV collagen lack this periodic banding.