Z-Line
/ziː laɪn/
The boundary between sarcomeres in muscle fibers where actin filaments attach.
Zinn
/tsɪn/
The Annulus of Zinn; a fibrous ring surrounding the optic nerve at the back of the orbit.
Zona Fasciculata
/ˈzoʊnə fəˌsɪkjʊˈleɪtə/
The middle layer of the adrenal cortex that produces glucocorticoids like cortisol.
Zona Glomerulosa
/ˈzoʊnə ɡləˌmɛrjʊˈloʊsə/
The outermost layer of the adrenal cortex, responsible for secreting aldosterone.
Zona Pellucida
/ˈzoʊnə pəˈluːsɪdə/
The thick transparent membrane surrounding a mammalian ovum before implantation.
Zona Reticularis
/ˈzoʊnə rɪˌtɪkjʊˈlɛərɪs/
The innermost layer of the adrenal cortex that produces androgens.
Zonule of Zinn
/ˈzɒnjuːl əv tsɪn/
Fibers that connect the ciliary body with the lens of the eye, holding it in place.
Zuckerkandl
/ˈtsʊkərˌkændəl/
Organ of Zuckerkandl; a group of neuroendocrine cells located near the bifurcation of the aorta.
Zygapophysis
/ˌzaɪɡəˈpɒfɪsɪs/
The articular process of a vertebra that helps it join with an adjacent vertebra.
Zygoma
/zaɪˈɡoʊmə/
The bony arch of the cheek.
Zygomatic
/ˌzaɪɡəˈmætɪk/
Relating to the cheekbone or the zygomatic bone.
Zygomaticus Major
/ˌzaɪɡəˈmætɪkəs ˈmeɪdʒər/
A muscle that extends from the cheekbone to the corner of the mouth; the 'laughing muscle'.
Zygomaticus Minor
/ˌzaɪɡəˈmætɪkəs ˈmaɪnər/
A muscle that originates from the zygomatic bone and aids in facial expressions like pouting.