ClipArt ETC
"<em>A</em>, membrane of hair follicle, showing cells with nuclei and pigmentary granules; <em>B</em>, external lining of root sheath; <em>C</em>, internal lining of root sheath; <em>D</em>, cortical or fibrous portion of hairshaft; <em>E</em>, medullary portion (pith) of shaft; <em>F</em>, hair bulb, showing its development from cells." — Blaisedell, 1904

Hair Follicle

"A, membrane of hair follicle, showing cells with nuclei and pigmentary granules; B,…

Section of a mesenteric gland from the ox. Labels: a, Hilus; b, medullary substance; c, cortical substance with indistinct alveoli; d, capsule.

Mesenteric Gland

Section of a mesenteric gland from the ox. Labels: a, Hilus; b, medullary substance; c, cortical substance…

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across and perpendicular to the growth rings.

Medullary Rays

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across…

"Section of Stratified Thallus of Ricasolia herbacea. a, cortical stratum; b, gonidial stratum; c, medullary stratum." &mdash;The Encyclopedia Britannica, 1910

Thallus

"Section of Stratified Thallus of Ricasolia herbacea. a, cortical stratum; b, gonidial stratum; c, medullary…