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Skeletal Muscle vs. Dense Regular Connective Tissue (tendon). One more time…. Skeletal muscle . Tendon. Muscle Fiber Types . Cross Section of Skeletal M uscle S tained for Myoglobin

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Skeletal muscle vs dense regular connective tissue tendon
Skeletal Muscle vs. Dense Regular Connective Tissue (tendon)

  • One more time….

Skeletal muscle

Tendon


Muscle (tendon)

Fiber Types


Cross Section of Skeletal (tendon)Muscle Stained for Myoglobin

-Type I Fibers (aka. Red Fibers, Slow Oxidative): Darkly staining b/c more myoblobin, slow twitch, fatigue resistant, but generate less tension

-Type IIa Fibers (aka. Intermediate fibers, fast glycolytic oxidative fibers): Variable staining, fast-twitch, fatigue resistant, capable of anaerobic glycolysis

- Type IIb Fibers (aka. White Fibers, Fast Glycolytic): Lightest staining, fast-twitch, fatigue prone, lots of glycogen, low myoglobin, round, large

White

Red


Nerve Stuff (tendon)


Motor End Plate (tendon)

-where black staining nerves

contact muscle

-looks like the rubber part of a plunger



Peripheral Nerves: (tendon)

-In the accurate words of the legendary Dr. Boggus:

“Circle of wavy shit”


Peripheral (tendon)Nerves:

-Endonuriem: around each axon

-Perinuriem: around each peripheral nerve

-Epinuerium: around each

bundle of peripheral nerves


Peripheral (tendon)Nerves:

-Endonuriem (EN): around each axon

-Perinuriem (P): around each peripheral nerve

-Epinuerium(EPI): around each

bundle of peripheral nerves

*from demo on blackboard


Peripheral Nerve: Longitudinal Section (tendon)

-Field of bubbly wavy shit

-Nodes of Ranvier are the short vertical lines b/w Shwann cells

(ie the ties b/w the sausage links)


Myelinated (tendon) Nerve:

-Nuerilemma: surrounds the myelinated cells

-Node of Ranvier: the dark line b/w Shwann cells where the nuerilemma

appears pinched.

Myelin

Axon

Myelin


Myelinated (tendon) Nerve:

-Myelin sheath is stained black (the small black circles)


Ganglion: (tendon)

-Looks like a bunch of FRIED EGGS

-DON’T confuse this with peripheral nerve (circle of W.S.)! In a peripheral nerve

cross section, the dark spot is an axon, not a nucleus w/ a nucleolus, and the white

of the egg is a pale myelin sheath with a dark outline as opposed to cell cytoplasm.


Ganglion vs peripheral nerve
Ganglion vs (tendon). Peripheral Nerve

Ganglion

Peripheral Nerve

-Circle of W.S.

-Fried eggs

-Dark axons

surrounded

by pale myelin

sheaths with darker

outlines

-Lots of satellite

cells!

-Darkish staining

cytoplasm in

neurons that tends

to look shrunken/pull

away from surroundings

(ie white space)

-I spy a nucleolus!


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