Identify the structure at the arrow.

Identify the structure at the arrow.

• A. Bowman's capsule
• B. Glomerulus
• C. Thyroid follicle
• D. Collecting tubules of the kidney

Answer: (B)

This item is about recognizing parts of the renal corpuscle in a histology image. The structure shown is the glomerulus, a compact tuft of capillaries inside Bowman's capsule. The glomerulus has a dense knot of fenestrated capillaries through which blood is filtered, and you often see red blood cells coursing within these loops. It sits within Bowman's space, the surrounding cavity formed by Bowman's capsule. Distinguishing features help: a knot of capillaries identifies the glomerulus, whereas Bowman's capsule would appear as the surrounding lining that encloses the tuft; thyroid follicles would display spherical follicles filled with colloid, characteristic of the thyroid gland; collecting tubules appear as tubular ducts lined by simple cuboidal epithelium rather than a capillary tuft. So the arrow points to the glomerulus.

This item is about recognizing parts of the renal corpuscle in a histology image. The structure shown is the glomerulus, a compact tuft of capillaries inside Bowman's capsule. The glomerulus has a dense knot of fenestrated capillaries through which blood is filtered, and you often see red blood cells coursing within these loops. It sits within Bowman's space, the surrounding cavity formed by Bowman's capsule. Distinguishing features help: a knot of capillaries identifies the glomerulus, whereas Bowman's capsule would appear as the surrounding lining that encloses the tuft; thyroid follicles would display spherical follicles filled with colloid, characteristic of the thyroid gland; collecting tubules appear as tubular ducts lined by simple cuboidal epithelium rather than a capillary tuft. So the arrow points to the glomerulus.