THE IN-BETWEENERS ◆ ISSUE #09 ◆ SERIES II: THE CARTILAGE DIVISION
The Shock Absorber
Fibrocartilage · she / her
“Built to squash, not to bounce.”
POWER: Takes a crushing load all day and hands it straight back.
WEAKNESS: One bad lift and she blows out sideways. And she heals worst of anyone here.
FIBERS: Thick parallel collagenA structural protein in the dermis that provides strength and elasticity. bundles you can actually see.
SECRET IDENTITY: Between every vertebra in your spineProminent ridge on the posterior scapula dividing it into supraspinous and infraspinous fossae., and in your knee.
Fibrocartilage is the body’s shock absorber, used wherever compressive force meets the skeleton.
Takes Everyone’s Drama. Never Snaps Back.
Where she lives, what she does, and the one thing she can’t do
Where she lives
- Intervertebral discs
- The menisci of the knee
- The pubic symphysisCartilaginous joint connecting the two pubic bones at the midline., which stretches during childbirth
Her powers
- Cushions and spreads the forces on joints and weight-bearing structures
- Supports the vertebral column and absorbs shock with every step
Her weakness
She is neither vascularizedTo invade a tissue with blood capillaries. nor innervated, so she repairs poorly. A torn meniscus is a long-term problem.
Squeeze a disc too hard and part of it bulges out sideways: a herniated disc.
Every weakness is the structure.
Rows of Friends Between Thick Ropes
Rows of cellsThe basic structural and functional units of life. between thick ropes of collagen
The crew: cells
ChondrocytesMature cartilage cells housed in lacunae. in lacunae, like all cartilageA flexible connective tissue found in joints, the ear, nose, and rib cage. Cartilage can be of three, but lined up in rows or clusters squeezed between the collagen. Their cytoplasmThe gel-like substance within a cell that contains organelles and cytosol. often washes out in fixation, so they look a little stripped down.
The fibers
Thick, parallel or wavy bundles of collagen dominate. That’s the whole point. Special stains can turn them pink, orange, and blue for a rainbow rendering.
The matrix
Collagen, proteoglycans, GAGs, and waterThe universal solvent essential for life., but the fibers are so dominant that the matrix “look” is mostly fibers.
Only One Good Photo and She Knows It
Real slides. Find her in every one.
ID HINT: Rows of chondrocytes between thick parallel collagen bundles.
Exhibit A
Micrographs: University of Michigan Histology, licensed under CC BY-NC-SA 3.0.
Stalk Their Actual Profile
Drive the microscope yourself
Virtual slide: intervertebral disc
The purple tab on the right opens a panel with information and links.
Prove You Were Actually Paying Attention
Prove you can spot her
Mission 1: Discover the features of fibrocartilage
Mission 2: The Dense Three quick check
Videos Nobody Asked You to Watch (Watch Them)
Not Her Twin. Stop Asking.
Students confuse her with these two. Here’s how to tell.
Captain Lengthwise
Dense regular. Parallel collagen too, but no lacunae: just flat nucleiClusters of neurons in the CNS responsible for processing information. squeezed between the stripes. Find chondrocytes in lacunae and it’s her. (Smooth muscle can fool you the same way.)
The Glider
Hyaline cartilage. Same cells in lacunae, but a smooth, glassy matrix with no visible fibers.
List of terms
- collagen
- spine
- pubic symphysis
- vascularized
- cells
- Chondrocytes
- cartilage
- cytoplasm
- water
- nuclei